Asme b4 1 1967 (2004) scan (american society of mechanical engineers)

Preferred Limits and Fits for Cylindrical Parts USAS B4.1-1967 (R1974) Note For soft conversion of nominal dimensions and limits given in this standard, inch = 25.4 mm For explanation of conversion techniques see American National Standard 2210.1-1972, Metric Practice Guide REAFFIRMED 1999 FOR CURRENTCOMMllTEE PERSONNEL PLEASE SEE ASME MANUAL AS-11 REAFFIRMED 2004 FOR CURRENT COMMITTEE PERSONNEL PLEASE E-MAIL CS@asme.org sponmr The American Society of Mechanical Engineers T H EA M E R I C A NS O C I E T Y U n i t eEdn g i n e e r i nCge n t e r OF M E C H A N I C A LE N G I N E E R S 345 E a s4t7 tSht r e eNteYwo r k , N Y 10017 Copyrighted material licensed to Stanford University by Thomson Scientific (www.techstreet.com), downloaded on Oct-05-2010 by Stanford University User No further reproduction or distribution is permitted Uncontrolled wh S T A N D A R D U S A ACCEPTANCE NOTICE The above IndustryStandardization Document was adopted on January 1972 and is approved for use by the DoD The indicated industry groups have furnished the clearances required by existing regulations Copies of the document are stocked by Do0 Single Stock Point, U.S Naval Publications and Forms Center, Philadelphia, Pennsylvania 19120, for issue to DoD activities only Title of Document: Preferred Limits and Fits for Cylindrical Parts - Plus Errata Date of Specific Issue Adopted: 18September1967 Releasing Industry Group: The American Society of Mechanical Engineers Custodians: Army - MU Navy - SH Air Force - 70 Military Coordinating Activity: Air Force - 70 Project No MISC-0596 No part of this document may be reproduced in any form, in an electronic retrieval system or otherwise without the prior written permission of the publisher a, C o p y r ~ g h r 1367 b y T H E A M E R I C A N S O C I E T Y O F M E C H A S I C A LE N G I N E E R S Prlnred In U S A Copyrighted material licensed to Stanford University by Thomson Scientific (www.techstreet.com), downloaded on Oct-05-2010 by Stanford University User No further reproduction or distribution is permitted Uncontrolled wh ANSI84.1-1967 January 1972 T HIS standard represents t h e latest result of vork which began w i t h the organization of Sectional Committee B4 i n June 1920 under the name “Sectional Committee on the Standardization of PlainLimitGages for GeneralEngineering’ Work ” Thisoriginalcommitteeproduced AmericanStandard ASA B4a-1925,“Tolerances,Allowances and Gagesfor Metal F i t s , ” which was used in varying degree for many years In December1930,SectionalCommittee 64wasreorganizedandthe name changedtothe presentform,“SectionalCommittee on theStandardization of Allowances and Tolerances for Cylindrical Parts and L i m i t Gages.” The change in name indicated a significant shift to a more definite and somewhat more restricted mission for the committee During the years of WorldWar I1 an ASAWar Committee formed i n 1943 worked on theproject but produced no completed results, and the activity was turned back to Sectional Committee B4 Afterthe war the subject was discussed at the Canadian Conference on the Unification of Engineering Standards held i n Ottawa in 1945, attended by delegates from Great Britain, Canada, i n NewYork later in the same year and the United States, and again at another joint meeting Thesemeetingsaresignificantbecausesince 1945 work i n t h i s projecthasbeenstronglyinfluenced by theseandsimilar ABC conferences.Properevaluationofthepresentstandard w i l l depend upon an appreciation of the important effects of progress towards agreement on u n i fication of standards between t h e ABC countries Theresult of theactivitiesimmediatelyfollowing World War 11 was 4merican Standard “Limits and Fits for Engineerirg and Manufacturing (Part I), ASA B4.1-1947.” In the preface to that document it was stated that the ABC meetings resulted i n agreement on five b a s ~ cprinciples, and since the first four of these principles, w i t h certain minor and obvious variations, apply to them here.First,there m u s t be a this present standard, i t is considered worth whiletorepeat common language (definitions) through which analyses may be recordedandconveyed.Second, a table of preferred basic sizes helps i n reducingthe number of differentdiameters commonly used in a givensizerange.Third,preferredtolerances and allowancesare a logicalcomplement topreferredsizes a n d should a i d the designer i n se!ectingstandardtolerances.Fourth, uniformity of method of applying tolerances is essential Additional ABC conferences were held i n NewYork i n June 1952 and February 1953 Delegations from SectionalCommittee B4 were active i n theseconferences, which resulted i n a draft proposal for an ABC system of Limits and Fits, published as ASA 84/30 The Sectional Committee B4 delegates to these conferences voted to recommend approval of the ABC proposals as the basis for an American standard i f and when such a standard were developed Sincethepublication of t h i s standardtherehas been additionaldiscussions a t ABC conferences held i n Ottawa i n June 1960 a n d at Arden House, New Y o r k , in September 1962 There of definitions under ASA B1.7,and theyarereflected in therevision hasbeenanexpansion Therevisedproposalwassubmittedtothesponsororganizationandtothe USA Standards Institute (formerly American Standards Association) for final approval a s a USA Standard This approval was granted on August 3, 1966 This revision,however,wasneverpublishedasitwasnotedthatotherrhanges.agreed to at the Arden House ABC Conference, had not been incorporated i n the standard A new revisionwasissued,andfollowingapproval by the USA StandardsCommittee , i t was approved by the sponsor and on September 18, 1967 by the USA,Standards Instirute USA STANDARD T h i s USA Standard is one of nearly 3000 standards approved a s American t h e ASA Standards by the American Standards Association On August24,1966, was reconstituted as the United States of America Standards Institute Standards approved a s American Standards are n o w designated USA Standards There is no change in their.index identification or technical content UDC 621.753.1.3 111 Copyrighted material licensed to Stanford University by Thomson Scientific (www.techstreet.com), downloaded on Oct-05-2010 by Stanford University User No further reproduction or distribution is permitted Uncontrolled wh Foreword B4, Standardizationof AllowancesandTolerancesforCylindricalPartsandLimitGages OFFICERS G H Stimson, Chairman COMMITTEE MEMBERS AMERICAN SOCIETY FOR QUALITY CONTROL R J Morris, International Harvester Co., C h i c a g o , I11 AMERICAN SOCIETY O F M E C H A N I C A L E N G I N E E R S , T H E Z R Bliss, Brown University, Providence, R I R T Woythal, Kearney Trecker Corp., Milwaukee, Wisconsin AMERICAN SOCIETY OF TOOL AND MANUFACTURING ENGINEERS G H Stimson, Greenfield Tap and Die, Division of United-Greenfield Corp., Greenfield, ANTI-FRICTION BEARING MANUFACTURERS ASSOCIATION, INC H L P o t t e r , T h e F a f n i r B e a r i n g Co., New Britain, Conn BUSINESS EQUIPMENT MANUFACTURERS ASSOCIATION A E Mall, International Business Machines Corp., Endicott, METAL CUTTING TOOL INSTITUTE A F Miller, Jr., Wells Tool Co., Greenfield, N Y Mass NATIONAL ELECTRICAL MANUFACTURERS ASSOCIATION F V Kupchak, Westinghouse Electric Corp., Pittsburgh, Pa L D P r i c e , A l t e r n a t e , N a t i o n a l E l e c t r i c a l M f g r s A s s o c i a t i o n , N e w Y o r k , N NATIONAL MACHINE TOOL BUILDERS’ ASSOCIATION F S B l a c k a l l , 111, T h e T a f t - P e i r c e Mfg Co., Woonsocket, R I SOCIETY OF AUTOMOTIVE ENGINEERS, I N C R F Holmes, General Motors Technical Center, Warren, Michigan SPORTING ARMS AMMUNITIONS MANUFACTURERSASSOCIATION J F Walsh, Olin Mathieson Chemical Co., New Haven, Conn U S D E P T OF T H E ARMY C B K e a n e , F r a n k f o r d A r s e n a l , P h i l a d e l p h i a , U S D E P T O F C O M M E R C E I H Fullmer, National Bureau Pa of Standards, Washington, D C U S D E P T O F T H E NAVY Code 609.3C, Bureau of Ships, Navy Dept., Washington, D C J.C R e i d , A l t e r n a t e , B u r e a u of Ships, Navy Dept., Washington, D C U S MACHINE, CAP, WOOD AND TAPPING SCREW BUREAUS H G Muenchinger, Holo-Krome Screw Corp., Hartford, Conn INDIVIDUALMEMBERS W S Brown, Roanoke, Virginia H W Fahrlander, Sr., St P e t e r s b u r g , F l a W H Gourlie, West Hartford, Conn R E W Harrison, Harrison Engineering Services, Inc., Washington, Ronald Jones, Westinghouse Electric Corp., Philadelphia, Pa A S c h m i d t , T h e P e n n s y l v a n i a S t a t e U n i v e r s i t y , U n i v e r s i t y P a r k , L F Spector, Hitchcock Publishing Co., Wheaton, Ill H D Stover, Timken Roller Bearing Co., Canton Ohio iv D c Pa Y Mass Copyrighted material licensed to Stanford University by Thomson Scientific (www.techstreet.com), downloaded on Oct-05-2010 by Stanford University User No further reproduction or distribution is permitted Uncontrolled wh USA StandardsCommittee PreferredLimitsand Fits forCylindricalParts 2.3 Size.Sizeis a designation of magnitude When a value i s a s s i g n e d to a dimension it i s referred to hereinafter a s the size of that dimension Scope and Application 1.1 Thisstandardpresentsdefinitions of terms applying to fits between plain (non-threaded) cylindrical parts and makes recommendations on preferred sizes, allowances, tolerances, and fits for u s e wherever they are applicable The standard through 20 in diameter i s in accord with the recommendations of American-British-Canadian Conferences Experimental work i s being carried onand when results are available, agreement in 20 in.will be sought It repretherangeabove sentsthecombinedthinkingandexperience of groups who have been interested in standards in thisfield,anditshouldhaveapplication for a widerange of products.Therecommendations, therefore, are presented for guidance and for use where t h e y might serveto improve andsimplify products, practices, and facilities Many factors, such as length of engagement, bearing load, speed, lubrication, temperature, must humidity,surfacetexture,andmaterials, be takenintoconsideration in theselection of fits for a particular application, and modifications intheserecommendations might be required to satisfyextremeconditions.Subsequentadjustments might also be desired as the result of experience in a particularapplicationtosuitcritical functional requirements or to permit optimum manufacturingeconomy.Selection of departure from theserecommendationswilldepend upon and economic consideration of theengineering factors that might be involved NOTE: I t i sr e c o g n i z e dt h a t the w o r d s“ d i m e n s i o n ” to c o n v e y the meanand “size” are both used at times i n g of magnitude 2.4 NominalSize The nominal size is t h e designation which i s u s e d for the purpose of general identification Basic Size.Thebasicsizeisthatsize from which the limits of size are derived by the application of allowances and tolerances ReferenceSize A referencesizeis a size without tolerance used only for informationpurposes and does not govern machining or inspection operations DesignSize The designsize is thebasic s i z e with allowance applied, from which the by theapplicationof limits of sizearederived tolerances If there i s n o allowancethedesign size is the same as the basic size ActualSize size a measured Limits of Size.Thelimits of sizeare the applicable maximum and minimum sizes (See 2.14, Tolerance Limit) Maximum MaterialLimit A maximum mais thatlimit of sizethatprovides reriallimit the maximum amount of material for the part Normally i t i s the maximum limit of size of an external dimension or the minimum limit of size of an internal dimension Definitions Termsrelatingtothesizeandfit whicharegenerallyapplicabletomechanical parts, are defined as follows: An a c t u a ls i z ei s 2.11 Minimum Material Limit A minimum material limit is that limit of size that provides the minimum amount of material for the part Normally it i s the minimum limit of size of an external dimension or the maximum limit of size of an internal dimension of parts Dimension A dimension i s a geometrical characteristic such a s diameter, length, angle, or centerdistance.The term “dimension” i s a l s o or used for conveniencetoindicatethesize numerical value of a dimension as specified on the drawing NOTE: Anexample of e x c e p t i o n s :a ne x t e r i o rc o r n e r radiuswhere the m a x i m u mr a d i wi st h em i n i m u mm a teriallimitand the minimumradius i s the maximum material limit Copyrighted material licensed to Stanford University by Thomson Scientific (www.techstreet.com), downloaded on Oct-05-2010 by Stanford University User No further reproduction or distribution is permitted Uncontrolled wh USA Standard 2.12 Allowance An allowance isa prescribed difference between the maximum-material-limits of mating parts It i s the minimum clearance (positive allowance) or maximum interference (negative allowance) between such parts (See 2.17 Fit.) 2.13 Tolerance A tolerance i s the totai permissible variation of asize Thetolerance i s the difference between the limits of size 2.24 Basic Hole System A basicholesystem i s a systemoffits in which the design size of thehole i s the basic size and theallowance, if any, i s applied to the shaft 2.25 BasicShaft System A basicshaft system i s asystemoffits inwhich the design size of the shaft is the basicsize and theallowance, if any, i s applied to the hole NOTE: Theplural term “tolerances”issometimes usedtodenotethepermissiblevariations from the specified or designsize, when thetolerance i s expressedbilaterally In this sense the term i s identical to “Tolerance limit.” 2.14 Toleraoce Limit A tolerancelimit i s the variation, positive or negative, by which a size i s permitted to depart from the design size (See 2.9, Limits of Size) 2.15 UnilateralTolerance A unilateraltolerance i sa tolerancein which variation i s permitted only in one direction from t h e design size 2.16 BilateralTolerance A bilateraltolerance i s a tolerance in which variation i s permitted in both directions from the design size 2.17 Fit Fit is thegeneral term used to signify therange of tightness or looseness which may result from the application of a specific combination of allowances and tolerances in the design of mating parts 2.18 ActualFit.Theactualfit between two mating partsisthe relationexisting between them with respect to the amount of clearance or interferencethat i s present when they areas- Preferred Basic Sizes In specifyingfits,thebasicsize of mating partsshall be chosen from the following tables (one for fractional and one for decimal sizes) whenever possible All dimensionsare given in inches TABLE Preferred Basic Sizes Fractional sembled NOTE: Fitsare of threegeneraltypes:clearance, transition, and interference 0.015625 0.03125 0.0625 0.09375 0.1250 0.15625 0.1875 5/16 3/8 7/16 1/2 9/16 5/8 11/16 3/4 7/8 0.3 125 1/4 2.19 Clearance Fit A clearance fit is one having limits of size so prescribed that a clearancealwaysresults when mating partsare assembled 2.20 InterferenceFit An interferencefit i s one having -limits of size so prescribed that an interferencealwaysresults when mating parts are assembled 51/64 1/32 1/16 3/32 1/8 5/3 3/16 1 :/4 1/2 13/4 2.21 Transition Fit A transition f i t i s one having limits of size so prescribed that either aclearance or a n interference m a y result when mating parts are assembled 1/4 1/2 3/4 3 1/4 1/2 3/4 2.22 Unilateral Tolerance System A design is plan which uses only unilateraltolerances known a s a unilateral tolerance system 2.23 BilateralTolerance System A design plan which uses only bilateral tolerances i s known a s a bilateral tolerance system 4 1/4 1/2 3/4 0.2 500 0.3750 0.4375 0.5000 0.5625 0.6250 0.6875 0.7500 0.8750 1.0000 1.2500 1.5000 1.7500 2.0000 2.2500 2.5000 2.7500 3.0000 3.2500 3.5000 3.7500 4.0000 4.2500 4.5000 4.7500 1/11 1/2 3/4 1/2 1/2 a 1/2 112 10 10 1/2 11 11 1/2 12 12 1/2 13 13 1/2 14 14 l / 15 151/2 16 16 1/2 17 17 1/2 18 181/2 19 19 1/2 20 5.0000 5.2500 5.5000 5.7500 6.0000 6.5000 7.0000 7.5000 8.0000 8.5000 9.0000 9.5000 10.0000 10.5000 11.oooo 11.5000 12.0000 12.5000 13.OOOO 13.5000 14.0000 14.5000 15.0000 15.5000 16.0000 16.5000 17.0000 17.5060 18.0000 18.5000 19.0000 19.5000 20.0000 Copyrighted material licensed to Stanford University by Thomson Scientific (www.techstreet.com), downloaded on Oct-05-2010 by Stanford University User No further reproduction or distribution is permitted Uncontrolled wh USA STANDARD Acceptance of Parts TABLE Preferred Basic Sizes 5.1 Acceptability A part shall be dimensionally acceptable if its actual size does not exceed the limits of sizespecified in numericalvalues on the drawing or in writing It does not meet dimensionalspecification if itsactualsizeexceeds those limits Decimal 0.010 0.012 0.016 0.020 0.025 0.032 0.040 0.05 0.06 0.08 0.10 0.12 0.16 0.20 0.24 0.30 0.40 0.50 0.60 0.80 1.00 1.20 1.40 1.60 1.80 2.00 2.20 2.40 2.60 2.80 3.00 3.20 3.40 3.60 3.80 4.00 4.20 4.40 4.60 4.80 5.00 5.20 5.40 5.60 5.80 6.00 6.50 7.00 7.50 8.00 8.50 9.00 3.50 10.00 10.50 11.00 11.50 12.00 12.50 5.2 ReferenceTemperature.Limits of s i z ea s derived from t h e tolerances shown herein are the extremevalues,withinwhichtheactualsize of the dimension shall lie, at the standard temperature of 20C or 68F 13 OO 13.50 14.00 14.50 15.00 15.50 16.00 16.50 17.00 17.50 18.00 18.50 19.00 13.50 20.00 For Length deviations per inch (or per centimeter) for temperaturesotherthan68F,and for variouscoefficients of thermalexpansion,referenceshould be made to thetables inAppendix 11 5.3 Limitsandtolerancesareconsidered to be absoluteregardless of the number of decimal places Limits and tolerances are to be used a s i f they were continued with zeros beyond the last significant figure Preferred Series for Tolerances and Allowances NOTE: This means that all inaccuracies of size, due to errors,wear, or changein tools, gages,machines, processes of measurement,shall be includedwithin these limits A l l fundamentaltolerancesandallowances of all shafts and holeshavebeentaken from the series given in the following table A l l dimensions are given in thousandths of an inch 5.4 Effect of Surface Texture Parts of necessity of surfaceirreguaremeasuredoverthecrests larities, yet for moving partssuchirregularities Soon wear off and clearances are increased For this reason surface finish is quite critical, especiallyforthefinergrades,andshould be specified when considerednecessary.Forfurther subject refer to USA Standard detail o n this Surface Texture, USAS B46.1 TABLE 0.1 0.15 200 18 0.2 20 22 250 0.2525 30 0.3 .35 0.4 .45 0.5 0.6 0.7 0.8 0.9 125 1.2 1.4 160 1.6 1.8 2.2 2.5 2.8 3.5 4.5 10 12 14 16 100 40 50 60 70 80 28 StandardTolerances Theseries of standardtolerancesshown in Table are s o arrangedthat forany onegrade theyrepresentapproximatelysimilarproduction considerationsthroughouttherange of sizes Thetableprovides a suitablerange from which appropriatetolerances for holesandshaftscan be selected.Thisenablestheuse of standard gages.Thesetoleranceshave been used in arranging the fits given in Tables to Copyrighted material licensed to Stanford University by Thomson Scientific (www.techstreet.com), downloaded on Oct-05-2010 by Stanford University User No further reproduction or distribution is permitted Uncontrolled w PREFERRED LIMITS AND FITS TABLE Tolerance values are in thousandths of an inch Data in bold face are Nominal Over - I Grade Grade Grade 0.15 0.20 0.25 0.3 0.4 0.4 0.5 0.6 0.7 0.8 0.9 1.o 1.o 1.2 1.6 2.0 2.5 0.25 0.3 0.4 0.4 0.5 0.6 0.7 0.9 1.o 1.2 1.2 1.4 1.6 2.0 2.5 0.4 0.5 0.6 0.7 0.8 1.o 1.2 1.4 1.6 1.8 2.0 2.2 2.5 10 To 0.12 0.12 - 0.24 0.24 - 0.40 0.40 - 0.71 0.71 1.19 1.19 - 1.97 1.97 - 3.15 3.15 - 4.73 4.73 - 7.09 7.09 - 9.85 9.85 - 12.41 12.41 - 15.75 15.75 - 19.69 19.69 - 30.09 30.09 - 41.49 41.49 - 56.19 56.19 - 76.39 76.39 -100.9 100.9-131.9 131.9 -171.9 171.9 -200 - 0.12 0.15 0.15 0.2 0.25 0.3 0.3 0.4 0.5 0.6 0.6 0.7 0.8 0.9 1.o 1.2 1.6 o 2.5 5 10 12 16 Grade 0.6 0.7 0.9 1.0 1.2 1.6 1.8 2.2 2.5 2.8 3.0 3.5 10 12 16 20 25 S e I e c t i o n o f F i t s Grade 1.o 1.2 1.4 1.6 2.0 2.5 3.0 3.5 4.0 4.5 5.0 6 10 12 16 20 25 30 40 in accordance with ABC agreements Grade 10 Grade 11 Grade 12 1.6 1.8 2.2 2.8 3.5 4.0 4.5 10 12 16 20 25 30 40 50 60 2.5 3.0 3.5 4.0 5.0 7 10 12 14 16 10 12 12 14 16 20 25 30 40 50 60 80 100 18 25 20 22 30 40 50 60 80 100 160 125 Grade 13 10 12 16 18 22 25 28 30 35 40 50 60 80 100 125 160 200 250 been extended to include a wider range of s i z e s Standard fits are represented graphically by Figures to In selecting limits of size for any application, the type of fit i s determined first, based on the u s e or service required from the equipment being designed;thenthelimits of s i z e of themating parts are established, to assure that the desired fit will be produced Theoretically an infinite number of fits could be chosen, but the small number of standard fits shownhereinshouldcovermostapplications 8.2Designation of StandardFits.Standardfits by means of the symbols given aredesignated of fit for below to facilitate reference to classes educationalpurposes.Thesesymbolsarenot intended to be shown on manufacturing drawings; i n s t e a d ,s i z e ss h o u l db es p e c i f i e d on drawings The letter symbols used are a s follows: RC Running or Sliding Clearance Fit LCLocationalClearanceFit L T T r a n s i t i o n C l e a r a n c e o r Interference Fit LNLocationalInterferenceFit F N F o r c e or Shrink Fit Theselettersymbolsareusedinconjunction withnumbersrepresentingthe class of fit;thus “ F N 4” represents a c l a s s , force fit E a c h of these symbols (two letters and a number) represents a complete fit, for which the minimum and maximum clearance or interference, and the limits of size for the mating parts, are given directly in the tables Standard Fits 8.1 T a b l e s to havebeendevelopedtogive a s e r i e s of standard types and classes of fit on a unilateral hole basis, such that the fit produced one classwillproduce by matingpartsinany approximatelysimilarconditionsthroughoutthe range of sizes T h e s e t a b l e s p r e s c r i b e t h e f i t f o r any given size, or type of fit; they also prescribe thestandardlimitsforthematingpartswhich will produce the fit In developing Tables to it has been recognized that any fit will usually be required to performone of three functions, as indicated by the three general typesof fits: running fits, iocational fits, and force fits T h ef i t sl i s t e di nT a b l e s to containall thoseintheapprovedABCproposalbuthave 8.3 Description of Fits 8.3.1 Running and Sliding Fits Runningand slidingfits,forwhichlimitsofclearancc.are given in Table , are intended to provide a sim- Copyrighted material licensed to Stanford University by Thomson Scientific (www.techstreet.com), downloaded on Oct-05-2010 by Stanford University User No further reproduction or distribution is permitted Uncontrolled w USA STANDARD ilarrunningperformance,withsuitablelubricationallowance,throughouttherange of sizes Theclearances for thefirst two c l a s s e s ,u s e d chiefly as slide fits, increase more slowly with diameter than the other classes, so that accurate location i s maintainedevenattheexpense of free relative motion 10 H T h e s e f i t s may be described briefly a s follows: areintendedfortheacRC Close sliding fits m u s t assemcurate location of parts which ble without perceptible play 6, LC11 12 y $ m RC9- -2 -4 -6 -8 - -10 12 14 16 - 18 - -20 - 22 E O In -2 p -4 -6 HOLES FIG GRAPHICAL REPRESENTATION OF STANDARD LOCATIONAL CLEARANCE FITS (SHOWN IN TABLE 6) -I SHAFTS -8 -IO FIG GRAPHICAL REPRESENTATION OF STANDARD RUNNING OR SLIDING CLEARANCE FITS (SHOWN IN TABLE 5) RC Sliding fits are intended for accurate location but with greater maximum clearance thanclass RC Parts made to thisfit move and turn easily but are not intended to run freely,andinthelarger s i z e s may seize with small temperature changes RC Precision running fits are about the closest fits which can be expectedto run freely, and are intended for precision work at slow speeds and light journal pressures, but are not suitable where appreciable temperature differencesarelikely to be encountered RC Closerunningfits areintendedchiefly for runninR with - f i t s on accuratemachinery moderatesurfacespeeds and journalpressures, where accurate location and minimum play is desired 8.3.2 Locational Fits Locational fits are fits intended to determineonlythelocation of the mating parts; they may providerigid or accurate or provide location,as with interferencefits, some freedom of location, as with clearance fits Accordingly t h e y aredividedintothreegroups: clearancefits,transitionfits,andinter'ference fits Theseare more fullydescribed a s follows: LC Locationalclearance fits areintended for partswhichare normally stationary, but which can be freely assembled or disassembled.They run from snug fits for parts requiringaccuracy of location, through the medium clearancefits for p a r t ss u c s ball,raceandhousing,to t h e looserfastener fits where freedom of assembly is of prime importance LT Locational transition fits are a compromise between clearance and interference fits, for application where accuracy of location i s important, but either a small amount of clearance or interference i s permissible RCS Medium running fits are intended for higher running speeds, or heavy journal pressures, R C or both R C Free running /its are intended for use where accuracy i s not essential, or wherelarge temperaturevariationsarelikelyto be encountered, or under both of these conditions -2 Looserunningfits areintended for use wherewidecommercialtolerances may be necessary,together with an allowance, on t h e external member HOLES ~ SHAFTS SCALE: THOUSANOTHS OF AN W H FOR A OIAWETER OF ONE INCH FIG GRAPHICAL REPRESENTATION OF STANDARD LOCATIONALTRANSITIONFITS (SHOWN IN TABLE 71 Continued on page 12 Copyrighted material licensed to Stanford University by Thomson Scientific (www.techstreet.com), downloaded on Oct-05-2010 by Stanford University User No further reproduction or distribution is permitted Uncontrolled wh PREFERRED LIMITS AND FITS TABLE RUNNING AND SLIDING Limits are in thousandths FITS of an inch Limits for hole and shaft are applied algebraically to the basic size to obtain the limits of size for the parts Data in bold face are in accordance with ABC agreements in ABC System (Appendix 1) Symbols H5, g5 etc., are Hole and Shaft designations used I 171.9 -200 8.0 18.0 + I 6.0 12.08.0 8.0 22.0 +10.0 - 8.0 48.0-12.0 22.0 I +16.0 -22.0 -32.0 22.0 63.0 t2S.O -22.0 -3t O Continued on page Copyrighted material licensed to Stanford University by Thomson Scientific (www.techstreet.com), downloaded on Oct-05-2010 by Stanford University User No further reproduction or distribution is permitted Uncontrolled wh USA STANDARD TABLE LOCATIONAL CLEARANCE FITS Limits are in thousandths of an inch Limits for hole and shaft are applied algebraically to the basic size to obtain the limits of s i z e for the parts Data in bold face are in accordance with ABC agreements ABC System (Appendix I) Symbols H6, h5, etc., are Hole and Shaft designations used in Nominal Size Range Inc he s Over To - 0.12 0.12- 0.24 0.24- 0.40 0.40- 0.71 0.71- 1.19 191 1.97 1.97- 3.15 3.15- 4.73 4.73- 7.09 7.09- 9.85 9.8512.41 12.41 15.75 15.75- 19.69 19.6930.09 30.09- 41.49 1.49- 56.19 56.19- 76.3 76.39- 100.9 100.9 - 131.9 131.9 - 171.9 171.9 - 200 Continued on page Copyrighted material licensed to Stanford University by Thomson Scientific (www.techstreet.com), downloaded on Oct-05-2010 by Stanford University User No further reproduction or distribution is permitted Uncontrolled wh USA STANDARD TABLE LOCATIONALCLEARANCE FITS (continued from page ) Limits are in thousandths of an inch Limits for hole and shaft are applied algebraically to t h e b a s i c s i z e to obtain the limits of s i z e for the parts Data in bold face are' in accordance with ABC agreements Symbols H9, f8, etc., are Hole and Shaft designations used in ABC Syst.em (Appendix 1) Class LC = Standard Limits cci - :$ -w !- 0.3 1.9 0.4 2.3 0.5 2.8 Shaft Hole f8 H9 + + + 1.0 I- 0.3 - 0.9 1.2 - 0.4 - 1.1 1.4 - 0.5 - 1.4 Class LC Standard Limits c) c, 2: -'a Hole H10 Shafl e9 0.6 + 1.6 3.2 0.8 + 1.8 3.8 1.0 t 2.2 4.6 0.6 - 1.6 - 0.8 2.0 1.0 2.4 I - 0 u '2 -z 2.2 10.2 2.5 12.0 2.8 12.8 + 5.0 + 6.0 + 6.0 Shaft d7 '2 - - 2.0 2.2 5.2 2.5 6.0 2.8 6.8 J-JY 5.0 5.0 + + 9.0 - 10 - + 5.0 - 5.0 - - 8.5 + - - -10 +- 77 18.5 - + 20 -0 23 25 -11.5 29 -7 -12 -8 - -14 +lo - - -15 +9 Hole H11 2.5 6.6 2.8 7.6 3.0 8.7 Shaft + + + + - Inc 3.5 - 6.3 5.04.5 - 8.0 4.0- '- Limits U -e '2 ic 2.5 - 2.5 - 4.1 12 3.0 - 2.8 4.5 4.6 14.5 3.5- 3.0 - 5.2 17 + + - C l a s s L C 11 C l a s s L C 10 c10 - - t- - 10.5 + - 21 - - 12 +lo - 24 - - 14 +1102 - 10 - 17 12 t - 32 - - 20 14 + 14 - 14 37 - - 23 16 + 16 - 16 42 - - 75 26 3.0 + 4.0 - 3.0 9.5 - - 5.5 15 4.0 + 3.5 - 4.0 11.5 - - 7.0 17.5 16 4.5 Hole H10 Standard Limits c 2.0 + 2.8 - 2.0 3.5 6.4 - - 3.6 10.3 2.5 + 3.5 - 2.5 4.5 8.0 - - 4.5 13.0 5.0 + Standard Limits 1.0 + 1.6 - 1.0 3.6 - - 2.0 1.2 t 1.8 - 1.2 4.2 - - 2.4 + 2.2 -1.61.6 5.2 - - 3.0 13.5 2.0 Class LC Class LC 20 23 28 10 34 Hole H12 + + + - + - - + + 10 - + 12 - 11 + 14 Shaft 1- - 4.5 9.5 11 - - - - 13 - - 15 - - 18 - 10 - 22 - 11 39 - - 25 +-111862+ - - - 28 +-1 218 26t - 2 - 34 20+20 -20 60 - - 40 52 22 + 22 66 - 25 + 25 - - - 22 -44 - 25 - 115 50 u :$ -'g Standard Limits Hole H13 Shaft + 17 - 11 - z; 25 + To Over - 0.12 '0 r 1! d.12 - 16 t1028 - 10 + 12 34 - - 18 10 22 o.24 0.24 - 0.40 0'40 - O'' 0"1 - "19 12 + 16 - 12 - "" 14 50 + 18 - 14 - - 32 1'97 - 3'15 16 60 t 22 44 - - 28 - 16 - - 38 3*13- 4.73 4'73 68 - - - - 78 - - 50 28+30 28 - 58 88 30 100 35 +- 3; - i3 +- 40 - 137; ~ Nominal Standard Size Range Inches Copyrighted material licensed to Stanford University by Thomson Scientific (www.techstreet.com), downloaded on Oct-05-2010 by Stanford University User No further reproduction or distribution is permitted Uncontrolled when PREFERRED LIMITS AND FITS 7'09 - 9.85 - 12.41 12.41 - 15.75 15." - 19'69 ~ End of Table 0.40 - 0.24 -0 9.85 - - 12.41 7.09 9.85 15.75 - 19.69 12.41 - 15.75 7.09 - 4.73 3.15 - 4.73 I +0.6 4.6 +2 0 -0.6 I- I -0.6 +2.6 -0 tQ.6 -0 +1.8 -0.6 +0.4 -0.4 +0.5 -0.5 +1.6 t2.4 m I L -4.2 +0.2 x t0.7 -0.7 I I +0.8 +2 +2.9 - -0.8 +2.5 I +1.2 +0.4 +0.25 -4.4 -0.25 +0.3 -0.5 +1.6 t -0.3 L t I - t L t0.3 -0.3 -0.5 +2.1 I -0.4 +1.4 +1.8 - 1.97- 3.15 -0 +1.05 - +1.2 -0.3 +1.5 1.19 -0.3 +1.0 +1.3 - +0.2 -0.2 +0.15 -0.15 -0.15 +0.5 t0.65 - -0.2 t +0.9 - -0.25 +0.8 rO.10 -0.2 +0.6 +0.8 - Hole Shaft -0.10 Shaft -0.10 + t0.50 - Ifole Standard Limits t2.5 tble H7 i i Fit i t18 Hole ClL a sTs -2.7 +4.0 t +3.8 - t 1.8 k6 Shaft Standard Limits +2.3 - -1.8 i Standard Standard Standard Limits Limits Fit Fit C l a s s LT i +2.7 t0.2 k7 Shaft -0 +2.5 +3.4 +0.7 - +1.8 -3.4 +0.25 Limits Hole Shaft H7 n6 -0.5 -t0.4 +0.5 +0.1 C lL a sTs End of Table +2.0 +3.4 1xx-4 Standard Class LT -3.4 in ABC System (Appendix I) Symbols H7, js6, ctc., are Hole and Shaft designations used Class LT maximum clearance (plus values) Data in bold face are in accordance with ABC agreements of s i z e for the mating parts represents the maximtim interference (minus values) and the Class LT ” 1.19 - 1.97 0.71 0.40 - 0.71 0.24 - 0.12 To 0.12 - Over Nominal Size Range Inches “Fit TABLE LOCATIONAL TRANSITION F I T S Limits are in thousandths of an inch Limits f o r hole and shaft are applied algebraically to the basic size to obtain the limits Copyrighted material licensed to Stanford University by Thomson Scientific (www.techstreet.com), downloaded on Oct-05-2010 by Stanford University User No further reproduction or distribution is permitted Uncontrolled whe T A B L E L O C A T I O N A LI N T E R F E R E N C E FITS Limits are in thousandths of an inch Limits for hole and shaft are applied algebraically to the b a s i c s i z e to obtain the limits of s i z e for the parts Data in bold face are in accordance with ABC agreements, Symbols H7, p6, etc., are Hole and Shaft designations u s e d i n A R C System (Appendix I) Class LN 0.6 2.9 15.75 - 19.69 19.69 - 30.09 30.03 - 41.49 - 56.19 56.19 - 76.39 76.39 ;:1 1 i : :1 + 41.49 - 100.9 100.7 -13 1.9 131.9 -171.9 171.9 -200 I :' 11::'; 0.9 3.5 1.2 4.2 1.5 4.7 '051: 2.0 0.5 + 0.5 + 2.5 - 7.0 +- '40 ++ +- 03.0 + 4.0 + - + 5.0 - + 6.0 - + 6.0 - +10.0 - I - + ;: 5.5 + 3.5 - + +11 +6 - I+ I I + +14 14 - + +18 +10 18 - +12 +12 +24 24 - +16 11 30 11 +16 +30 - +20 1.4 + 2.9 - + 2.0 + 1.6 + - + 2.5 + 1.8 + 4.2 - + 3.0 + 2.0 ' + 4.7 - !+ I 7.C 4.5 11.5 + + + + p - 40 +11.5 1+12 +10 50 +40 E n d of T a b l e Copyrighted material licensed to Stanford University by Thomson Scientific (www.techstreet.com), downloaded on Oct-05-2010 by Stanford University User No further reproduction or distribution is permitted Uncontrolled whe P R E F E R R E D LIMITS AND FITS Continued from page m i2 t ModifiedStandardFits 9.1 Bilateralhole o r b a s i cs h a fst y s t e mf i t s havingthe same amounts of c l e a r a n c e or interference remain the same a s those shown in Tables to , but the limits of size are calculated for h o l e s or shafts and differ from those shown in the tables This may be accomplished by one of t h e following: - HOLES SHAFTS SCALE: THOUSANDTHS OF AN INCHFOA A DIAMETER OF ONE INW FIG G R A P H I C A L R E P R E S E N T A T I O N O F S T A N D A R D LOCATIONALINTERFERENCEFITS T A B L E 8) (SHOWN I N (a)Bilateralholes(SymbolB)-Thiswillresult in nonstandard holes and shafts (b) A basic shaft system (Symbol S)-This will result in nonstandard holes and shafts LN Locational interference f i t s areusedwhere accuracy of l o c a t i o n i s of prime importance andforpartsrequiringrigidityandalignment with no special requirements for bore pressure.Suchfitsarenotintendedfor p a r t s d e s i g n e d to transmitfrictionalloads from oneparttoanother by virtue of the t i g h t n e s s of fit, a.s t h e s ec o n d i t i o n sa r e covered by force fits 8.3.3 Force Fits F o r c e or shrinkfitscons t i t u t e a s p e c i a l t y p e of interference fit, normally characterized by maintenance of constant bore pressuresthroughouttherange of s i z e sT h e interference therefore varies almost directly with diameter, and the difference between its minimum andmaximumvalue i s s m a l l to maintaintheresulting pressures within reasonable ‘limits T h e s e f i t s maybe described briefly as follows: FN Lightdrivefits arethoserequiringlight assemblypressuresandproducemoreor less permanent assemblies They are suitable for t h i ns e c t i o n s or longfits,orin cast-iron external members FN ,Medium drivefits a r e s u i t a b l e for ordinary s t e e l p a r t s or forshrinkfitsonlightsections They are about the tightest fits that canbeusedwithhigh-gradecast-ironexternal members FN3 Heavydrivefits aresuitableforheavier s t e e pl a r t s or for shrinkfitsinmedium sections Forcefits are suitable for parts which can be highly stressed or for shrink fits where the heavy pressing forces required are 3- I -2 a1”OLES 9.2 BilateralHole Fits (SymbolB).Thecommon case is where holes are produced with fixed t o o l s ,s u c sd r i l l s or reamers;toprovide a longer wear life for such tools a bilateral tolerance is desired, The symbols used for t h e s e f i t s a r e i d e n t i c a l withstandardfitsexceptthattheyarefollowed a locational by theletter“B.”Thus“LC4B”is clearance fit, class 4,except that is is produced with a bilateral hole The limits of clearance or interference are identicalwiththoseshowninTables to forthe corresponding fits The hole tolerance is changed so that the plus limit i s t h a t foronegradefinerthanthevaIue shown i n t h e t a b l e s , t h e m i n u sl i m i t e q u a l s the amount by which the plus limit was lowered, and theshaftlimitsarebothlowered by the same amount asthelowerlimit of s i z e of t h e hole Thefinergrade of tolerancecanbefoundin Table 9.3 BasicShaftFits(Symbol S) Forthesefits the maximum s i z e of t h e s h a f t i s b a s i c a n d t h e a l l o w a n c ei sa p p l i e dt ot h eh o l e T h el i m i t s of c l e a r a n c e o r interference are identical with tRse showninTablesS to forthecorresponding fits T h e symbols u s e d for these fits are identical with those used for standard fits except that theyarefollowedbythe letter “S.” T h u s “ L C 4s” i s a l o c a t i o n a lc l e a r a n c ef i t ,c l a s s4 ,e x cept that it is produced on a b a s i c s h a f t b a s i s ‘The limits for hole and shaft a s g i v e n i n to areincreasedforclearancefits, c r e a s e d for transition or interference fits, value of theuppershaftlimit;thatis, amountrequiredtochangethemaximumshnftto the basic size SHAFTS SCALE : THOUSANDTHS of AN INCH FOR A DIAMETER OF ON VlCH FIG G R A P H I C A L R E P R E S E N T A T I O N O F S T A N D A R D FORCEORSHRINKFITS (SHOWN I N T A B L E 9) 12 Tables or deby che by the Copyrighted material licensed to Stanford University by Thomson Scientific (www.techstreet.com), downloaded on Oct-05-2010 by Stanford University User No further reproduction or distribution is permitted Uncontrolled whe USA STANDARD 9.4 If standard stock sizes or special conditions use of otherholesizesandshaft requirethe s i z e s , r e f e r e n c e s h o u l d bemadefortherequired I which are taken froin f i t t o tables in Appendix the ABC proposal DIAMONO BORING BROACHING 10 Machining Processes REAMING TURNING To indicatethemachiningprocesseswhich m a y normally be expected to produce work within thetolerancesindicated bythegradesgivenin this Standard, Fig has been provided This information is intended merely as a guide in selecti n gs u i t a b l ep r o c e s s e s for a particulargrade BORING MILLING PLANING SHAPING DRILLING FIG M A C H I N I N G P R O C E S S E S 13 Copyrighted material licensed to Stanford University by Thomson Scientific (www.techstreet.com), downloaded on Oct-05-2010 by Stanford University User No further reproduction or distribution is permitted Uncontrolled whe P R E F E R R E D LIMITS AND F I T S T A B L E FORCEANDSHRINKFITS L i m i t s a r e i n t h o u s a n d t h s of an inch Limits for hole and shaft are applied algebraically Data in bold face to t h e b a s i c s i z e to o b t a i n t h e l i m i t s of s i z e for the parts are in accordance with ABC agreements I) S y m b o l s H7, s , etc., are Hole and Shaft designations used in ABC System (Appendix Class FN Nominal SizeRange Inches To Over - 0.12 o.12 - o.24 0.24 - 0-40 0*40 - o ' 0.56 - 0.71 0'71 - 0'95 0*95- '.19 l.58 1.97 1*97- 2.56 ~ - 3-15 3.1s3.944.73 - 5.52- 5+52 6'30 * - 7*09 7.09 - 7.88 7*88 - 8.86 - 9.85 9.85 - I1.O3 11.03 - 12.41 * -13-98 13.98-15-75 15.75 - 17*72 U s A LI U w Hole H6 + 0.1 0.75 0.1 0.8 0.2 0.9 0.2 1.1 0.3 1.2 0.3 1.3 0.4 1.4 0.9 +0.9 -0 1.1 2.6 1.2 2.9 +0.9 - +1.0 - +1.0 - +1.0 - +1.2 -0 +1.2 -0 1.8 - 2.3 +1.2 -0 2.8 +1.2 -0 +1.2 -0 +1.4 -0 +1.4 -0 +1.6 - +1.6 - 4.3 4.9 2.8 4.9 3.1 5.5 3.6 6.1 4.4 7.0 4.4 7.0 0.4 W7 -],C + 0.2 0.83 - 0.2 1.0 - + + + + + 0.8 I + + 1.8 1.3 + 1.9 1.4 + 2.4 1.8 + + + 2.6 + 2.0 + 2.9 + 2.2 + + + + + + + + + + + + + + 3.2 2.5 3.5 2.8 3.8 3.0 4.3 3.5 4.3 3.5 4.9 4.0 4.9 4.0 + 5.5 + + + + + + + I 0.8 2.4 - 0.8 2.7 t-1.2 - 1.0 2.9 1.4 3.7 1.6 3.9 I - ~ + + I - - +1.6 -0 4.5 2.4 5.0 - 2.9 + 5.5 - 3.2 + 6.2 - 3.2 + 6.2 - 4.2 +1.8 7.2 4.0 7.2 5.0 8.2 5.8 9.4 5.8 9.4 6.5 10.6 4.5 6.1 5.0 7.0 6.0 7.0 6.0 11.6 - +2.0 - +2.0 - +2.2 - +2.2 -0 4~2.5 -0 - Standard Limits Loo " Hole E Hole H7 Shaft 0.8 t0.8 2.1 - 1.0 + 2.6 - 41.2 ~1.0 2.8 - 2.4 1.8 + 2.7 + 2.0 + 2.9 + 2.2 + 3.7 + 2.8 + 3.9 I +1.2 3.2 I - -11.2 1.8 + 3.7 - + + + + + + + + + + + 2.8 + 2.2 +1 3.2 +2.5 I + + 3.7 3.0 4.4 3.5 + I 4.2 , - 2.8 + 4.7 - 5.9 - I + 13.2 + l o 10.0 13.2 12.0 - + 9.0 15.2 + +11.4 13.8 - +10.0 17.4 15.8 +2.2 - +12.0 19.4 17.5 9.0 13.6 - 21.6 11.5 ++11.6 +2.5 7.5 +15.6 + 23.6 15.6 -+10.0 7.0 10.2 7.0 10.2 7.8 11.4 9.8 13.4 14 +2.0 - +2.0 t 9.0 liole H8 t 0.6 1.3 - +0.5 + 0.7 0.4 1.7 - 2.0 2.3 0.8 2.5 3.0 + t- +1 03 - + 2.2 + 3.3 + 1.2 1.3 3.3 - 1.4 + 1.6 4.0 - t 4.2 3.5 + t 21 38 6.2 - 4.2 + 1.8 7.2 - + + 5.9 + 5.0 +4.66.9 - +4.8 + 32 62 8.4 - +2.5 4.0 +3.0 + + 5.0 2.4 + 4.0 +3 26 +5.0 7.2 6.0 + + + + + + 8.4 7.0 5.8 + 9.4 - 715 + 2.5 11.6 - + 2.5 13.6 - +9.5 + 2.5 13.6 - 11.2 + 15.8 - 2.8 13.2 ++11.2 17.8 - 9.4 8.0 +11.6 +10.0 9+13.6 1-12.0 +13.6 +12.0 +15.8 +14.0 +17.8 +1.8 +16.0 17.8 -+12.0 t17.8 +16.0 13.2 + 2.8 3.0 15.0 ++13.2 20.0- - + 3.0 - +14.0 22.0 - + t 18.5 + 3.5 - +16.0 24.2 + ++13.4 +19.4 21.5 + 3.5 -0 27.2 -+18.0 4.0 +13.6+21.6 +2.5 +2.5 9.5 + +10.6 -+12.0 +20.0 30.5 - + 4.0 +2.5 +23.6 19.5 - +22.0 32.5 - +2.0 - +12.0 ++10.2 2.0 + + + x7 1.3 0.9 1.7 1.2 0+ 52.0 + + 1.6 5.0 - 4.7 4.0 + 0.9 3.4 2.8 + + Shaft - + 1.4 + 0+ 62.3 - + 1.6 + 2.5 t- + 1.8 - + 4.9 +1.4 6.9 - + 6.0 8.0 6.0 4-1.6 +5.4 5.0 8.0 - + + +5 84 6.0 5.0 8.0 - + + 9.0 6.4 + 8.0 6.0 - + +10.2 8.2 10.2 - + 8.2 11.2 - +10.0 8.0 d 0.95 0.7 1.2 0.9 + + + 1.6 + 1.2 +0.7 1.8 +1.8 1.0 3.4 - ,E Standard Limits :i Class FN 0.6 + 1.6 - + 0.7 - + 1.4 0.7 + 0.7 4- 1.8 - + 1.4 0.8 + 0.8 -t 2.1 2.1 - + 1.0 + + 2.3 2.3 - + 1.8 1.5 + + 3.1 3.1 - + 2.5 2.1 t1.6 + 2.6 + 2.0 , " u6 6.2 +1.8 t 9.2 10.2 t t13.2 6.0 7.2 6.0 8.2 7.0 9.4 8.0 9.4 8.0 Shaft J.5 + 9.2 - + 7.2 i Ilole ti7 1.2 - + 3.5 5.0 + + E Standard Limits 0.3 + 0.95 - 5.5 +4.5 + 6.2 + 5.0 + 6.2 + 5.0 +1 4.5 + - -" c vi t6 +2.1 4+ + 4.4 - + 4-1.4 2.6 + + - 0+ 0+ 3.4 +1.6 + 6.0 - + + 3.4 6+ + - +04 0+ 4.4 +1.6 + 7.0 - + 5.2 + + 8.2 - + 5.2 + + 8.2 - + + 0.85 +0.4 0.6 1.0 +0.5 0.7 1.4 1.4 - + 1.0 0.5 + + 1.6 - + 1.2 0.5 +0.7 + 1.6 1.6 - + 1.2 0.6 + + 1.9 1.9 - + 1.4 1.9 1-0.8 +0.6 + 1.4 1.9 - 0.8 + + 2.4 2.4 - + 0.5 Class FN Class FN e., .3 Shaft s6 + 0.75 0.4 + + + 0.4 +0.7 3.5 1.8 3.8 2.3 4.3 "- ,0 0.6 E Standard Limits CJ E i - + 0.5 + 0.9 +0.4 -0 + 0.6 + 1.1 +0.5 - + 0.7 + 1.2 +0.5 - +0.8 + + 1.3 - + 0.9 + 1.4 +0.6 - + 1.0 0.7 1.9 3.2 + + +0.4 -0 0.6 + 1.8 ~.~ - 1.5 + 0.5 0.3 ' Class FN a T vi" Shaft 0.05 + 0.5 - 0.1 + 0.6 - 2.4 4.73 Standard Limits c vi - - 8.2 +20.0 +18.0 17.0 422.0 +15.2 +2O.O +24.2 +22.0 +27.2 +25.0 24.0 +30.5 ~ +28.0 26.0 +32.5 +30.0 C o n t i n u e d o n p a g e 15 Copyrighted material licensed to Stanford University by Thomson Scientific (www.techstreet.com), downloaded on Oct-05-2010 by Stanford University User No further reproduction or distribution is permitted Uncontrolled w USA STANDARD T A B L E F O R C E AND SHRINK FITS (Continued from p a g e 14) L i m i t s a r e i n t h o u s a n d t h s of an inch Limits for hole and shaft are applied algebraically to the basic size to o b t a i n t h e l i m i t s of s i z e for the parts Data in bold face are in accordance with ABC agreements ABC System (Appendix 1) S y m b o l s H , s , etc., are Hole and Shaft designations used in Nominal SizeRange Inches To Over 19.69 -24.34 - 30.09 30'09 - 35.47 -41.49 41'49 -48'28 48.28 - C l a s s FN r r o Standard Limits g II - E ; 6.0 9.2 7.0 10.2 Hole H6 + 2.0 - + 2.0 - + 2.5 Shaft t- 9.2 + 8.0 -tlO.2 + 9.0 Class F N ;;8 -II 9JE ,52 9.0 14.0 11.0 16.0 C l a s s FN Standard Limits Hole + + 3.0 - + 3.0 - + + + Standard Limits s6 ,sz 14.0 12.0 16.0 14.0 15.0 + 3.0 + 20.0 - +17.0 + + 22.0 - + Shaft H7 z: = ; c U Hole Shaft H7 t6 20.0 18.0 22.0 20.0 Class FN $ z vI ;j $ Standard Limits c Hole Shaft H7 u6 2 I 22.0+ 27.0 27.0+ 32.0 - 3.0 3.0 + 27.0 + 25.0 + 32.0 Class FN 38 Standard Limits g Hole 30.0 + - 5.0 35.0 + 5.0 43.0 - 38.0 Shaft x7 H8 + 38.0 35.0 + 43.0 + 40.0 + + 30.0 21.0 + 4.0 + 27.5 + 44.0 + 6.0 + 54.0 + 37.5 4.0 - +10.0 20.5 - + 18.0 27.5 - + 25.0 37.5 - + 35.0 54.0 - + 50.0 + 2.5 +13.6 + 4.0 16.0 + 2 24.0 t 4.0 + 30.5 36.0 + 4.0 + 43.5 54.0 + 6.0 + 64.0 - +12.0 22.5 - + 20.0 30.5 - + 28.0 43.5 - + 40.0 64.0 - + 60.0 11.0 + 3.0 +16.O 17.0 + 5.0 + 30.0 + 5.0 + 38.0 45.0 + 5.0 + 53.0 62.0 + - ~+ 75.0 16.0 - +14.0 25.0 - + 22.0 38.0 - + 35.0 53.08.- + 50.0 75.0 - + 70.0 13.0 + 3.0 +18.0 20.0 + 5.0 + 28.0 35.0 + 5.0 -t 43.0 55.0 + 5.0 + 63.0 72.0 + 8.0 + 85.0 18.0 - +16.O 28.0 + 25.0 43.0 - + 40.0 63.0 - + 60.0 85.0 - + 80.0 14.0 + 4.0 +20.5 24.0 + 6.0 + 34.0 39.0 + 6.0 t 49.0 + 6.0 +64.0 74.0 90.0 +10.0 +I06 20.5 - +18.0 34.0 - + 30.0 49.0 - -t 45.0 74.0 - + 70.0 106 - +lo0 18.0 -t 4.0 +24.5 + 39.0 (t4.0+ 6.0;- ~%-+ 6.0 +84.0110~+126 - 24.5 +22.0 39.0 - +/35.0 54.0 - -t 50.0 84.0 - + 80.0 126 - +120 20.0 + 5.0 +28.0 + 8.0 t32.045.0 52.0 + 8.0 + 65.0 + 8.0 + 95.0 128 +12.0 +I48 28.0 - +25.0 45.0 - + 40.0 65.0 - t 60.0 95.0 - + 90.0 148 - +I40 23.0 + 5.0 +31.0 37.0 + 8.0 t 50.0 62.0 + 8.0 + 75.0 92.0 + 8.0 + l o 148 +12.0 +I68 31.0 - +28.0 50.0 - + 45.0 75.0 - + 70.0 105 - + l o 168 - +I60 2ilO +6.0+34.040.0+10.0+56.070.0+10.0+86.0110+10.0+12/3~+16.0+130 34.0 - +30.0 56.0 - + 50.0 86.0 - + 80.0 126 - +I20 190 - + I + 6.0 +39.0 50.0 +10.0 + 66.0 80.0 +10.0 + 96.0 130 +10.0 +146 184 29.0 +210 +16.0 39.0 - +35.0 66.0 - + 60.0 96.0 - + 90.0 146 - +140 210 - +200 37.0 + 8.0 +50.0 58.0 +12.0 + 78.0 88.0+12.0+108 200 +20.0 +232 148 +168 +12.0 50.0 - 78.0 +45.0 - + 70.0 108 - +IO0 168 - +160 232 - +22O 42.0 + 8.0 +55.0 68.0 +12.0 + 88.0 108 230 +*O.O +26* +128 +12.0 168 +188 12.0 - +50.0 88.0 - o + 80.0 128 - o - 188 55.0 o +I80 262 - +250 50.0 +10.0 +66.O 74.0 +16.0 +IO0 124 +16.O +150 184 +16.0 +210 275 +25.0 +316 66.0 - +6O.O 100 - + 90 150 - +140 210 - +200 316 - +300 7.5 11.6 9.5 13.6 +11.6 + 4.0 +14.020.5 1- - 5G.19 - ~ 65.54 - 76'39 ""' -87'79 87'79 -100'9 100.9 - 1 1 -131.9 131.9 -152.2 ~~~ 152.2-171.9 -'O0 E n d of T a b l e 15 Copyrighted material licensed to Stanford University by Thomson Scientific (www.techstreet.com), downloaded on Oct-05-2010 by Stanford University User No further reproduction or distribution is permitted Uncontrolled wh P R E F E R R E D LIMITS A N D FITS I Limits for Holes C to X Tolerance Unit 0.001 in IJ-Upper Limit L-Lower Limit Diameters Over: To ( I n c h e s ) N ' IL- !.U+ g.0 0.1 0.4 0.1 L- .0.5 !L- lu+ 0.0 0.1 0.2 0.7 0.4 0.2 0.5 0.2 0.8 0.5 0.2 0.6 0.3 0.7 0.5 0.3 0.7 1.1 16 0.6 0.4 0.8 0.5 1.3 0.7 0.4 1.0 0.5 0.7 1.5 0.8 0.5 1.1 0.8 1.7 1.0 0.5 1.3 0.8 2.0 1.2 1.2 0.6 1.6 0.8 1.1 2.2 2.4 Continued on page 1.0 0.6 1.4 0.7 1.8 1.3 2.7 17 Copyrighted material licensed to Stanford University by Thomson Scientific (www.techstreet.com), downloaded on Oct-05-2010 by Stanford University User No further reproduction or distribution is permitted Uncontrolled wh APPENDIX Limits for Holes C to X ( C o n t i n u e d from p a g e 16) U-Upper Limit L-Lower Limit Tolerance Unit 0.001 in 17 End of Table Copyrighted material licensed to Stanford University by Thomson Scientific (www.techstreet.com), downloaded on Oct-05-2010 by Stanford University User No further reproduction or distribution is permitted Uncontrolled whe APPENDIX I LIMITS FOR SHAFTS c to x Tolerance Unit 0.001 in U-Upper L-Lower Limit Limit I I I Over:Diameters To (Inches) Copyrighted material licensed to Stanford University by Thomson Scientific (www.techstreet.com), downloaded on Oct-05-2010 by Stanford University User No further reproduction or distribution is permitted Uncontrolled whe APPENDIX I LIMITS FOR SHAFTS c to x (continued from page 18) Tolerance Unit 0.001 in L-Lower Limit U-Upper Limit I I (Inches) To Over: Diameters 0.5 0.7 1.1 0.1 I iU+ (0.3510.410.451 0.6 I 1.6 2.5 4.0 6.0 0.0 , I 0.6 0.8 1.3 0.1 1.8 3.0 4.5 7.0 0.0 0.8 1.1 1.7 0.1 2.5 4.0 0.7 1.0 I 1.5 0.1 2.2 3.5 5.0 9.0 0.0 I I 6.0 I 10.0 0.0 I 1.0 1.4 2.0 0.2 2.8 4.5 7.0 12.0 0.0 I 1.1 1.4 2.2 0.2 3.0 5.0 8.0 12.0 0.0 I 1.2 1.6 2.4 0.2 1.2 1.8 2.7 0.2 3.5 4.0 6.0 10.0 16.0 6.0 9.0 14.0 0.0 I 0.0 0.7 E 5-7 L+ U+ U+ 5-7 L+ 5-7 L+ u+ ~ 5-7 L+ U+ 5-7 U+ u+ iJ Y * 5-7 L+ 1.1 1.15 1.3 0.9 1.41.651.92.12.62.9 3.0 1.5 1.8 2.0 2.22.7 2.3 2.5 3.0 3:3 1.72.0 1.21.4 1.6 ,1.8 12.2 12.5 1 19 End of Table Copyrighted material licensed to Stanford University by Thomson Scientific (www.techstreet.com), downloaded on Oct-05-2010 by Stanford University User No further reproduction or distribution is permitted Uncontrolled wh APPENDIX I ' , Temperature Deg F , Coefficient of thermal expansion of material per degree F, X IO6 10 15 20 25 Total change in length from standard, microinches per inch of length 38 39 40 41 42 -30 -29 -28 -27 -26 -60 -58 -56 -54 -52 -90 -8 -84 -8 -78 -120 -116 -1 12 -108 -104 -1 50 -145 -140 -135 -130 -300 -290 -280 -270 -260 43 44 45 46 47 -25 -24 -23 -22 -21 -50 -48 -46 -44 -42 -7 -7 -69 -66 -63 -100 - 96 - 92 - 88 - 84 -125 -120 -1 15 -1 10 -105 -250 -240 -23 -220 -2 10 48 49 50 51 52 -20 -19 -18 -17 -16 -40 -38 -36 -3 -3 -60 -57 -54 -5 -48 80 76 72 68 64 -100 - 95 - 90 - 85 80 53 54 55 56 57 -1 -14 -13 -12 -11 -30 -28 -26 -4 -4 -3 - 58 59 60 61 60 56 52 48 44 40 36 32 28 24 20 16 12 - - - -2 -36 -33 62 -10 - - - - -20 -18 -16 -14 -12 -30 -2: -2 -2 -18 63 64 - - -10 - -15 -1 66 67 - - - - 68 0 69 71 72 73 74 75 76 77 78 10 - - 3 12 15 12 16 20 10 12 14 16 18 20 18 21 24 27 30 24 28 32 36 40 79 80 81 82 83 11 12 13 14 15 22 24 26 28 30 33 36 39 42 45 84 85 86 87 88 16 17 18 19 20 34 36 38 40 32 48 51 89 90 91 92 93 21 22 23 24 25 94 95 96 97 98 26 27 28 29 30 65 70 - -24 - - - - 30 -450 -43 -420 -405 -390 -600 -580 -560 -540 -520 -750 -725 -700 -675 -650 -900 -870 -840 -810 -780 -375 -345 -3 30 -315 -500 -480 -460 -440 -420 -625 -600 -575 -550 -525 -750 -720 -690 -660 -630 -200 -190 -180 -1 70 -160 -300 -285 -270 -255 -240 -400 -3 80 -3 60 -3 40 -3 20 -500 -475 -450 -425 -400 -600 -570 -540 -510 -480 75 70 65 60 55 -150 -140 -130 -120 - 110 -225 -2 10 -195 -180 -165 -300 -280 -2 60 -240 -220 -3 75 -3 50 -325 -3 00 -275 -450 -420 -390 -360 -330 - 50 - 45 - 40 - 35 - 30 -100 - 90 - 80 - 70 - 60 -1 50 -135 -120 -105 - 90 -200 -1 80 -1 60 -140 -1 20 -250 -225 -200 -175 -1 50 -300 -270 -240 -210 -180 - - - 60 - 45 - -125 -150 -120 - 90 - 60 - 30 - 25 20 15 - 10 - 5 10 50 40 30 20 - 10 10 20 -3 60 - 75 - 30 - 15 -100 80 60 40 20 -100 - 70 - 50 - 25 0 30 20 40 60 80 100 25 50 30 60 40 50 I5 30 45 60 75 100 125 120 150 30 35 40 45 50 60 70 80 90 100 90 105 120 135 150 120 140 160 180 200 150 175 200 225 50 180 210 240 270 300 44 48 52 56 60 55 60 65 70 75 110 120 130 140 150 165 180 195 210 225 220 240 60 80 00 275 330 60 90 420 50 80 54 85 90 95 100 46 48 50 63 66 69 72 75 84 88 92 96 100 105 110 115 120 125 160 170 180 190 200 210 220 230 240 250 240 57 60 64 68 72 76 80 52 54 56 58 60 78 81 84 87 90 104 108 112 116 120 130 135 140 145 150 60 270 280 290 300 42 44 1s 20 25 75 00 325 50 375 90 480 510 540 570 600 20 400 60 380 400 450 475 500 315 33 345 360 375 420 440 460 480 500 525 50 575 600 625 660 690 720 750 90 520 540 60 580 600 650 67 700 725 750 780 810 840 870 900 255 40 270 285 300 405 420 43 450 425 63 For intermediate coefficients add appropriate listed values For example, a length change for a coefficient o f is the sum of values in the and columns Fractional interpolation maybe similarly calculated *Or hundredths of micron (microns/100) per centimeter 20 Copyrighted material licensed to Stanford University by Thomson Scientific (www.techstreet.com), downloaded on Oct-05-2010 by Stanford University User No further reproduction or distribution is permitted Uncontrolled wh APPEND1X I I LENGTH DIFFERENCES PER INCH FROM STANDARD FOR TEMPERATURES 38 TO 98 F FROM STANDARDTEMPERATURE TO 40 LENGTHDIFFERENCESPERCENTIMETER TemperCoefficient ature Deg -20 -19 -18 -17 -16 -40 -3 -3 -3 -3 -60 -57 -5 -5 -48 -80 -76 -7 -68 -64 -3 -28 -26 -24 -22 -4 -42 -39 -36 -33 -60 -1 -14 -13 -1 -1 10 -10 -20 -3 -27 -24 -2 -18 -40 -3 -3 -28 -24 -15 -12 -20 -16 -12 - - x 10 of thermal expansion of material per degree C, 15 10 20 25 30 Total change in length from standard, hundredths of microns (microns/lOO)per centimeter of length CELSIUS 11 12 13 14 - - - -18 -16 -14 -12 15 16 17 18 19 - -10 - - - - - 20 21 22 23 24 25 26 27 28 29 - - - 0 -56 -52 -48 -44 -100 - 95 - 90 - 85 - 80 - 75 - 70 - 65 - 60 - 55 - 50 - 45 - 40 35 30 - 10 25 - 20 - 15 - 0 -200 -190 -180 -170 -160 -150 -140 -13 -1 20 -1 10 -100 - 90 - 80 - 70 - 60 - 50 - 40 - 30 - 20 - 10 -3 00 -400 -3 -360 -3 40 -3 20 -500 -475 -4 50 -425 -400 -600 -570 -540 -510 -480 -225 -195 -180 -165 -3 00 - 280 -2 60 -240 -220 -375 -350 -325 -3 00 -27 -450 -420 -3 90 -360 -330 -1 50 -135 -120 -105 - 90 -200 -180 -1 60 -140 -1 20 -2 50 -225 -200 -175 -150 -3 00 -270 -240 -2 10 -180 75 - 60 - 45 - 30 - 15 - -1 25 -1 50 -120 - 90 - 60 - 30 -28 -270 -255 -240 -2 10 - -1 00 80 60 40 20 -100 - 75 - 50 - 25 0 12 12 16 10 15 20 10 20 30 40 15 30 45 60 20 40 60 80 25 50 75 100 30 60 90 120 15 18 21 24 27 20 24 28 32 36 25 30 35 40 45 50 60 70 80 90 75 90 105 120 13 100 10 12 14 16 18 120 140 160 180 125 150 175 200 225 150 180 210 240 270 30 31 32 10 11 12 20 22 24 30 33 36 40 44 48 50 55 60 100 110 120 150 165 180 14 28 42 56 70 140 210 250 275 00 325 50 00 330 34 200 220 240 60 280 75 80 85 90 95 100 150 160 170 180 190 200 225 240 255 70 285 300 300 320 40 60 380 400 75 400 425 50 475 500 450 480 10 40 570 600 33 35 36 37 38 39 40 13 15 16 17 18 19 20 26 30 32 34 36 38 40 39 45 48 51 54 57 60 52 60 64 68 72 76 80 65 130 195 60 90 420 For intermediate coefficients add appropriate listed values For example, a length change for a coefficient of 11 i s thesumofthe values inthe and columns Fractional interpolations may be similarly calculated *Or microinches per inch C = 1.8 F 21 Copyrighted material licensed to Stanford University by Thomson Scientific (www.techstreet.com), downloaded on Oct-05-2010 by Stanford University User No further reproduction or distribution is permitted Uncontrolled wh APPENDIX I1 Copyrighted material licensed to Stanford University by Thomson Scientific (www.techstreet.com), downloaded on Oct-05-2010 by Stanford University User No further reproduction or distribution is permitted Uncontrolled wh _- L00022 ~