International Standard INTERNATIONAL ORGANIZATION FOR STANDARDIZATION@MEWYHAPO~HAR OPI AHM3ALWlR fl0 CTAH,QAPTbl3A~MM*ORGANlSATlON INTERNATIONALE DE NORMALISATION Ground thread taps for pipe threads G[.]
International Standard INTERNATIONAL ORGANIZATION FOR STANDARDIZATION@MEWYHAPO~HAR OPI-AHM3ALWlR fl0 CTAH,QAPTbl3A~MM*ORGANlSATlON Ground thread taps for pipe threads on the threaded series - Tolerantes Tarauds filets rectifik First edition pour filetages gaz kies G et Rp - DE NORMALISATION G series and Rp Portion sur Ia Partie taillke - 1979-10-15 U DC 621.993 Descriptors Tolhances INTERNATIONALE : tools, Ref No taps, pipe threads, dimensional ISO 59694979 (EI tolerantes Price based on pages FOREWORD ISO (the International Organization for Standardization) is a worldwide federation of national Standards institutes (ISO member bedies) The work of developing International Standards is carried out through ISO technical committees Every member body interested in a subject for which a technical committee has been set up has the right to be represented on that committee International organizations, governmental and nongovernmental, in liaison with ISO, also take part in the work Draft International Standards adopted by the technical the member bodies for approval before their acceptance the ISO Council International Standard ISO 5969 was developed Small tools, and was circulated to the member lt has been approved Australia Belgium Bulgaria Chile Germany, Hungary India Israel by the member F R bodies of the following cou ntries expressed Czechoslova France International Printed in Switzerland Organization by Technical Committee bodies in March 1978 Italy Japan Korea, Dem P Rep of Korea, Rep of Mexico Netherlands Poland Romania The mem ber bodies of the following on techni cal grounds : committees are circulated as International Standards for Standardization, 1979 countries ISO/TC to by 29, : South Africa, Rep of Spain Sweden Switzerland Turkey United Kingdom USSR Y ugoslavia disapproval of the document INTERNATIONAL STANDARD ISO 59694979 (E) Ground thread taps for pipe threads series - Tolerantes on the threaded Scope and field of application This International Standard specifies the deviations and tolerantes on the major diameter and the pitch diameter together with the limits of these diameters for ground thread taps intended for production of pipe threads G and Rp series according to ISO 228/1 and ISO 7/ respectively the threads tolerantes G series Portion - Part : and Rp Designa tion, ISO 22811, Pipe threads where pressure-tight made on the threads - Part : Designation, tolerantes dimensions join ts are not dimensions and The internal threads produced with these taps are conventionally designated by the simplified denomination of “nut” ISO 2284, Hand taps for pipe threads for parallel threads - General dimensions and marking ISO 2857, Ground thread taps for ISO metric threads tolerantes 4H to 8H and 4G to 6G coarse and fine pitches Manufacturing tolerantes on the threaded Portion References I S / 1, Pipe threads where pressure- tight jein ts are made on and and taper of - ISO 5969-1979 (El 3.1 3.1.1 Tolerantes Basic data Thread Profile H of nuts / / /’ //./’ ,,/ ;// / /’ 1’ / / /i , /’ / / / l ,’ / / /f/- 0,137 P ’ A L / //’ A i ‘/ / // / i-6 r / \ / Jf QI//v* ’ // // /’ -+ : ,’ / -r0 -2 / d’ 1‘&V J \ / L\ t- H , // / /’ v / II + / < /l / n //I ’ / /I / I TDl 5I H I / CY Figure D = Figure diameter D1 = basic minor diameter CY = Profile Q G series pitch P = pitch Thread a basic major Q2= 3.1.2 TDl = - of fundamental = minor diameter pitch diameter diameter TD2 = of thread h = basic depth included angle sf thread Rp series height triangle tolerante tolerante sf thread (55O) of taps Figure - Figure G series d=D = basic major diameter d = minimum Js = minimum permissible clearance d2 max = maximum = minimum pitch - Rp series pitch diameter major diameter ES = upper deviation of pitch diameter on major diameter Em = Iower deviation of pitch diameter Td2 = tolerante d, = D, = pitch diameter d, H diameter on pitch diameter ISO 59694979 (E) 32 Tolerante ISO 228/1 classes of taps and ISO 7/1 each specify See the values of Em and Es in tables and only one class of nut As a consequence, it is sufficient to have one class of taps for ISO 228/1 and another class of taps for ISO 7/1 3.4 Tolerantes on major diameter The tolerantes of these taps are determined in terms of a tolerante unit t, the value of which is equal to the nut pitch diameter tolerante TD2 The minimum value of the tap major diameter is calculated so that it is greater than the minimum permissible value of the nut major diameter by an amount equal to a stated fraction of the tolerante t of the nut 3.3 The upper deviation specif ied Tolerantes on pitch diameter The minimum and maximum values of the tap pitch diameter are calculated so as to be greater than the minimum permissible value of the pitch diameter of the nut by amounts respectively equal to 02 times and 0,4 times the nut tolerante t 3.3.1 Threads G series - The nut tolerante lower deviation 3.4.1 unilateral tolerante with zero The lower minimum See the values of Em and ES in tables and Threads The nut tolerante - Rp series is a positive deviation of the is a bilateral equi-spaced Threads - deviation The of the tap pitch diameter will then be deviation ES = - 0,l t (see lower is a bilateral deviation of the minimum equi-spaced diameter) A4 SS, I -? -,’ Tap I ’ Figure - Thread Pitch diameter of basic Profile G series Pitch diameter of basic Profile Figure - Thread - Rp series tolerante tap major diameter will be greater by 0,2 t than the nut See the values of Js in tables and Nut zero tap major diameter will be greater by 0,3 t than the nut Em = - 0,3 t and the upper figure 6) with Rp series Js = - 0,3 t (i.e tap diameter The lower tolerante diameter) The nut tolerante tolerante unilateral See the values of Js in tables and 3.4.2 (ISO 7/ 1) of the tap is not G series Js = + 0,3 t (i.e tap diameter The lower deviation of the tap pitch diameter will then be Em = + 0,2 t and the upper deviation ES = + 0,4 t (see figure 5) 3.3.2 - The nut tolerante lower deviation (ISO 228/ 1) is a positive Threads on the major diameter ISO 5969-1979 (E) 3.5 Tolerante cr/2 of thread The tolerante on the angle Basic major diameter d lp&+-+ - Taps for pipe threads Major Pitch 0,907 Examples Tables and show calculation examples a tap G WZ and Rp WZ respectively is k 30’ for all sizes Table Size designation cc and the half-angle - G series Basic pitch diameter diameter Lower deviation Js = + 0,3 t -t 0,032 d d2 - Dimensions Pitch diameter Lower deviation Em = + 0,2 t 7,755 d2min- / Upper deviation Es=+o,4t + 0,021 t-i 13,194 9,168 d2max7,185 7,163 + 0,043 t- 9,190 12,326 + 0,037 + 0,025 + 0,050 16,699 15,831 20,998 22,954 1,814 + 0,043 gi + 0,028 m + 0,057 E 26,484 30,244 33,303 31,770 1,806 31,842 37,951 36,418 36,454 36,490 1,964 40,43 + 0,054 53,800 40,503 40,467 + 0,072 + 0,036 /-GF 46,324 46,360 46,395 52,267 52,303 52,339 58,171 58,207 59,668 58,135 65,775 64,231 75,249 73,705 81,599 80,055 87,949 86,405 I 64,274 73,748 2,309 1/2 100,330 113,030 1/2 125,730 138,430 1/2 151,130 163,830 100,395 98,85 + 0,065 + 0,043 pzöc5 0,087 111,551 124,251 b 137,038 162,351 of in millimetres I I of the dimensions Table Basic major diameter Size designation - Taps for pipe threads - G series Number of threads per inch d - Dimensions in inches Pitch diameter Lower deviation Em = + 0,2 t + 0.001 + 0.000 + 0.001 d2 / I ll I 1/4 l 11 0.518 318 0.656 112 0.825 t 19 + 0.001 /,E%-tz + 0.001 + 0.001 + 0.002 0.486 0.6233 0.624 0.7804 0.781 0.485 Upper deviation Es = + 0,4 t ' , 0.8574 + 0.001 + 0.002 ' 0.996 1.311 1.309 118 1.4920 1.494 114 1.6500 1.6521 + 0.002 1 1.2508 1.252 I c / 1.4338 1.435 t 1.591 H 1.253 1.436 1.8820 1.884 1.8238 314 2.116 2.118 2.057 2.059 2 2.347 2.349 2.288 2.290 2 114 2.587 2.5896 2.530 112 2.960 314 3.2100 3.460 112 3.950 4.450 112 4.950 + 0.001 1.594 + 0.002 112 1.825 I t 2.5288 2.9626 1.593 ' 5 1.145 1.1444 0.858 0.997 - 1.826 I i 2.901 2.903 3.151 3.153 3.4626 3.401 3.403 3.9526 3.891 4.4526 4.391 4.9526 4.891 4.893 5.4526 5.391 H ’ 2.060 2.291 3.405 11 3.212 I + 0.0026 5.450 112 5.950 6.450 4.393 t-i t r + 0.003 i- 0.001 t 3.893 5.393 5.893 6.393 4.895 ISO 5969-1979 (El Table t - for pipe threads Taps - Rp series - Dimensions in millimetres Major Basic diameter Lower deviation Js = - 0,3 t 111 / Basic pitch d Pitch diameter Lower deviation Em = - 0,3 t diayrter Upper deviation Es=-0,l t dz max 7,099 7,128 9,104 9,133 - 0,043 0,907 11 - 0,043 t-i - 0,063 l-i -0,014 t- 12,238 /-g-++j - 0,063 1,337 112 20,955 314 26,441 { - 0,086 1,814 - 0,086 33,249 114 41,910 112 47,803 lt3E-tzi 59,614 I t - 0,109 1/2 75,184 87,884 113,030 2,309 59,505 75,054 1 73,705 86,405 -0,130 - 87,754 t 112,900 111,551 138,300 136,951 163,700 162,351 Taps for pipe threads - - 0,109 /q -0,037 pg - 0,130 ~1 -0,043 E 58,135 L Table - 0,029 lGzg-i% -0,021 15,743 Rp series - Dimensions in inches # Basic major diameter d Size designation Number of threads per inch Major diameter Lower deviation Js = - 0,3 t I d Basic pitch diameter d2 1116 0.304 118 0.383 114 0.518 318 0.656 112 0.825 0.302 t- 0.381 Pitch diameter I Lower deviation Em = - 0,3 t Upper deviation Es = - 0,l t 0.279 28 - -0.001 19 - 0.003 -0.005 1.304 1.645 1.877 2.342 =J -0.0043 0.3584 1.0376 - 0.004 - 0.002 - 0.0034 1.041 0.2806 - - 0.001 0.821 14 314 -0.002 0.481 0.619 0.775 0.991 l-i H ~1 0.000 - 0.000 - 0.001 -0.0015 l-i 0.359 pgj Table Example - : Calculation of the dimensions of the threaded of a G 1/2 ground thread tap Portion G 112 Tap designation Tap characteristics Basic major diameter = d = D = 20,955 mm Pitch = 1,814 mm Thread length = 26 mm Minimum d = d + Js = d + 0,3 t d = 20,955 mm Js = 0,3 t = 0,043 mm d = 20,955 + 0,043 = 20,998 major Basic pitch Minimum Minor pitch diameter diameter on angle CYand half-angle oJ2 Cumulative pitch error, +, over any number of threads Table - d2 =d2+Em = d, + 0,2 t d2 = 19,793 mm Em = 0,2 t = 0,028 mm d2 = 19,793 + 0,028 = 19,821 mm d2 max = d2 + Es = d, =I 0,4 t d2 = 19,793 mm Es = 0,4 t = 0,057 mm dz max = 19,793 + 0,057 = 19,850 mm Not specified diameter Tolerante mm d2 = 0, = 19,793 mm diameter pitch Maximum diameter Example f 30’ As in ISO 2857 : Calculation of the dimensions of an Rp l/2 ground thread of the threaded tap Rp 112 Tap designation Tap characteristics Basic major diameter d = D = 20,955 mm Pitch = 1,814 mm Thread length = 26 mm Minimum d = d - Js = d - 0,3 t d = 20,955 mm Js = 0,3 t = 0,086 mm d = 20,955 - 0,086 = 20,869 Basic pitch major Portion diameter mm d2 = D2 = 19,793 mm diameter d2min.=d2-Em=d2-0,3t Minimum pitch d2 = 19,793 diameter mm Em = 0,3 t = 0,086 mm d2 = 19,793 - 0,086 = 19,707 62 max = dz - Es = d2 - 0,l Maximum pitch d2 = 19,793 diameter mm t mm Es = 0,l t = 0,029 mm d2 max = 19,793 - 0,029 = 19,764 mm - Minor Not specified diameter Tolerante on angle cyand half-angle Cumulative pitch over any number error, TP, of threads 42 i 30’ As in ISO 2857 This page intentionally left blank This page intentionally left blank This page intentionally left blank