BRITISH STANDARD AEROSPAC E SERIES Procurement of self-locking nuts with non-metallic locking óóÀơ ơ ÀÀÀóÀ óÀơ Àơ ô Àô Àô ô Àóóó elements series Metric Specification IC S 49 íĐđÃạáơ ịđÃơÃ-á ơẳđẳ- ì-ơÃơôơà ẻằđẳôẵằẳ ắĐ ì ỉ ôẳằđ Ãẵằ-ằ âÃơá ịì ú ậ ẵơđằẳ íĐ ề đằđẳôẵơà đ ằơâđàÃạ ằđÃơơằẳ âÃơáôơ Ãẵằ-ằ đ ì ỉ ềơ đ ẻằ-ằ BS 2A 293:2005 BS 2A 293:2005 Committees responsible for this British Standard The p re parat ion of this British Standard w as e ntrust ed t o Te chnic al C o m mitte e, AC E /1 , Aerosp ace fas t ene rs and faste ning, upon w hich the fo llo wing b odie s we re repre sente d: Britis h C oatings Federatio n L td C ivil Aviat ion Authority, Airwo rt hines s E ne rgy Instit ute Minis try of D efence , UK D efe nce S tandardizatio n So c ie ty of Brit is h Aero space C om p anies This B rit ish St anda rd was p ub lis he d unde r the a utho rity o f the Sta nda rds Po licy an d S trat egy C om mitte e on 2 Fe b ruary 00 © BS I 2 Fe bruary 05 Amendments issued since publication Amd No D ate C o m me nt s The fo llo wing BS I re fere nces re la te to the wo rk o n th is B ritish S tan da rd : Co m m itte e re fe ren ce ACE /1 D r aft fo r co mm e nt 03 /31 78 D C ISBN 580 45229 óóÀơ ơ ÀÀÀóÀ óÀơ Àơ ụ ụ ụ ụ úúú íĐđÃạáơ ịđÃơÃ-á ơẳđẳ- ì-ơÃơôơà ẻằđẳôẵằẳ ắĐ ì ỉ ôẳằđ Ãẵằ-ằ âÃơá ịì ú ậ ẵơđằẳ íĐ ề đằđẳôẵơà đ ằơâđàÃạ ằđÃơơằẳ âÃơáôơ Ãẵằ-ằ đ ì ỉ ềơ đ ẻằ-ằ BS 2A 293:2005 Contents úú ô ô ô À À À ó À ó À ô ô À ô ô À ô À ô ô À ó ó ó Page Committees responsible Inside front cover Foreword ii Scope Normative references Terms and definitions Requirements and test methods Quality Assurance and product qualification testing approvals Packing, packaging and labelling 10 Inspection 10 Production acceptance test report 10 Annex A (normative) Axial loads and torque values for thread sizes M8 1.25, M10 1.5 and M12 1.5 17 Bibliography 19 Table Qualification approval testing requirements for self-locking nut samples 11 Table Qualification and production acceptance tests 12 Table Discontinuity depths 12 Table Axial load values 100 % axial load test 13 Table Maximum assembly and wrench torque test values 14 Table Maximum locking torque, minimum breakaway torque, assembly torque (vibration), push out and torque out values 15 Table Classification of defects 15 Table Sampling data for visual and dimensional characteristics 16 Table Sampling data for mechanical and metallurgical characteristics 16 Table 10 Contaminants 16 Table A.1 Maximum assembly and wrench torque test values for thread sizes M8 1.25, M10 1.5 and M12 1.5 17 Table A.2 Axial load values for thread sizes M8 1.25, M10 1.5 and M12 1.5 17 i © BSI 22 February 2005 íĐđÃạáơ ịđÃơÃ-á ơẳđẳ- ì-ơÃơôơà ẻằđẳôẵằẳ ắĐ ì ỉ ôẳằđ Ãẵằ-ằ âÃơá ịì ú ậ ẵơđằẳ íĐ ề đằđẳôẵơà đ ằơâđàÃạ ằđÃơơằẳ âÃơáôơ Ãẵằ-ằ đ ì ỉ ềơ đ ẻằ-ằ B S A 93 : 0 Fore wo rd This British Standard was prepared b y Technical Committee AC E/1 It supersedes BS A 93: 83, which is withdrawn BS A 93 is intended primarily for use in conj unction with thos e A series British S tandard aerosp ace sp ecifications in which conformity to this standard is a s pecific requirement This edition introduces technical changes in line with tes t methods BS A 95: 000 and harmonizes the procurement and testing of the metric series non- metallic self- locking nuts with the equivalent Unified series nuts conta ined in BS 3A 25 to 3A [ ] It may also b e ap plied to other aerosp ace metric threaded fasteners if required by the relevant specification, drawing, contract or order This s tandard invokes: a) quality assurance ap proval of the manufacturer; and b ) product qualification testing approval Annex A is included in this s tandard to p rovide information on the axial loads and torque values for thread sizes M8 5, M1 and M1 When there is no further requirement for these sizes, Annex A will be deleted by amendment This p ublication does not p urp ort to include all the neces sary provisions of a contract Us ers are responsib le for its correct app lication C o mp liance w i th a B ri tish S tandar d does not of its elf confer i mmu nity fro m legal o b ligati on s S ummar y of p ages This document comp rises a front cover, an inside front cover, pages i and ii, p ages to and a b ack cover The BSI copyright notice dis played in this document indicates when the document was last iss ued óóÀơ ơ ÀÀÀóÀ óÀơ Àơ Àơ Àơ Àóóó ii ịđÃơÃ-á ơẳđẳ- ì-ơÃơôơà íĐđÃạáơ ẻằđẳôẵằẳ ắĐ ì ỉ ôẳằđ Ãẵằ-ằ âÃơá ịì ú ậ ẵơđằẳ íĐ ề đằđẳôẵơà đ ằơâđàÃạ ằđÃơơằẳ âÃơáôơ Ãẵằ-ằ đ ì ỉ â ềơ đ ẻằ-ằ BS I 22 Fe bruary 005 BS 2A 293:2005 Scope This British Standard specifies the requirements for the procurement of self- locking nuts with non- metallic locking elements This standard invokes product qualification testing requirements and quality as surance approval procedures for manufacture of aerospace standard parts This s tandard is intended primarily for use with A series British Standard aerospace standards for metric self- locking nuts with non- metallic locking elements It is also applicable to other aerospace self- locking nuts if required by the relevant drawing, contract or order NO TE Where the requirements of the nut standard or drawing differ from this standard, they take precedence over the requirements of this standard Normative references The following referenced documents are indispens able for the ap plication of this document For dated references, only the cited edition app lies For undated references, the latest edition of the referenced document (including any amendments) applies BS 11 34 , Method for the assessment of surface texture BS 15 95- , Propan-2-ol (isopropyl alcohol) for industrial use (isopropyl alcohol) BS A 352- 2/ISO 5855- , MJ threads Part 1: Specification for propan-2-ol Part 2: Limit dimensions for bolts and nuts BS 2A 295/ISO 7481 , Methods of test for self-locking nuts with maximum operating temperature less than BS 3A 125 to 3A [ ] , Specification for stiffnuts (Unified threads) for aircraft or equal to 425 C BS E N 91 00, Aerospace series Quality management systems Requirements (based on ISO 9001:2000) and Quality systems Model for quality assurance in design, development, production, installation and servicing (based on ISO 9001 :1 994) Terms and definitions For the purposes of this British Standard the following terms and definitions apply self-locking nut with non-metallic locking element self- contained unit which cons ists of a nut body surmounted by a non-metallic locking element which imposes friction between its elf and the male screw thread upon which it is mounted nut body portion of the self- locking nut containing the screw thread 3 locking ele ment non-metallic portion of the self- locking nut designed to impose friction between itself and the male screw thread with which it is engaged NO TE The locking element does not operate by means of a sep arate movement as a result of installation and does not depend upon pressure on the b earing surface for the locking action maximum locking torque highest torque to overcome the friction encountered in any assembly or removal cycle with no axial load on the nut minimum breakaway torque torque required to start nut or bolt rotation from a fixed position during any removal cycle with no axial load on the nut óóÀơ ơ ÀÀÀóÀ óÀơ Àơ Àơ ụ ụ úúú â íĐđÃạáơ ịđÃơÃ-á ơẳđẳ- ì-ơÃơôơà BSI 22 February 2005 ẻằđẳôẵằẳ ắĐ ì ỉ ôẳằđ Ãẵằ-ằ âÃơá ịì ú ậ ẵơđằẳ íĐ ề đằđẳôẵơà đ ằơâđàÃạ ằđÃơơằẳ âÃơáôơ Ãẵằ-ằ đ ì ỉ ềơ đ ẻằ-ằ B S A 93 : 0 w rench torque minimum torque which the driving configuration of the nut has to withstand without any permanent deformation which would interfere with the appropriate wrench and preclude the reuse of the nut p er mane nt s et tes t measure of the performance of a nut on a minimum mandrel after having been subjected to a single assembly and removal cycle on a maximum stud re u sab ili ty tes t test to measure the torque required to remove a self-locking nut from a standard test bolt after a specified number of assembly and removal cycles p ro ductio n lot lot of finished nuts which have the basic part number and diameter, the individual elements of which have been fabricated by the same process from a single material batch, and which have been heat treated together to the same specified condition and produced as one continuous run i ns p e ctio n lo t 1 óóÀơ ơ ÀÀÀóÀ óÀơ Àơ Àơ Àơ Àóóó lot of nuts from a single production lot, of the same part number, which completely defines the nut Di s co ntinu iti es 3.1 1 crack rupture in the material which may extend in any direction and which may be intercrystalline or transcrystalline in character 3.1 s eam longitudinal surface defect in the form of an unwelded open fold in the material 3.1 lap surface defect caused by folding over metal fins or sharp corners and then rolling or forging them into the surface rando m samp le sample taken in such a manner that each unit in the inspection lot has the same chance of being the first unit in the random sample; and, after the first unit in the sample is taken, each of the remaining units in the inspection lot has the same chance of being the second unit in the sample; and so on 3 acce p tab le qu ali ty le vel AQL maximum percentage defective (or maximum number of defects per hundred units) that, for purposes of sampling inspection, can be considered acceptable as a process average limiting qu ality LQ magnitude of percentage defective, greater than the AQL, which, in accordance with the operating characteristic of the sampling/inspection plan, the purchaser runs a specified risk of accepting NOTE In this standard the LQ corresponds to a purchaser s risk of 10 % íĐđÃạáơ ịđÃơÃ-á ơẳđẳ- ì-ơÃơôơà ẻằđẳôẵằẳ ắĐ ì ỉ ôẳằđ Ãẵằ-ằ âÃơá ịì ú ậ ẵơđằẳ íĐ ề đằđẳôẵơà đ ằơâđàÃạ ằđÃơơằẳ âÃơáôơ Ãẵằ-ằ đ ì ỉ â BSI 22 February 2005 ềơ đ ẻằ-ằ BS A 93 : 0 R e qui re me n ts and te s t me th ods I ntr o du ctio n The t ec hnical re quireme nts and te st m e thods given in , , 4 , and co mple me nt the require me nt s of the s elf- loc king nut st andard or drawing, b ut c an supp le me nt the re quire m ents o f the m ate rial sp ec ific ation Tab le gives the te s ting fo r e ach characte ris tic of the s elf- lo cking nut sa mple ne ce ss ary for qualificatio n app ro val Tab le sum mariz es the te sting required fo r b o th qualification and p roduction acc ep tance te sting All tes ts shall b e carried o ut at am b ie nt te m pe rature unle s s o therw ise s p ec ifie d in a p artic ular te st m e thod NO TE A n ut is c ons idere d to be ass e mb le d wh en a m inim um o f tw o full m ale t hre ad s p lu s the ch am fer exte nd b e yond th e frictio n e le m e nt of th e n ut NO TE The re m o val c yc le is co ns ide red co m ple te w he n th e frictio n e le me nt is dise nga ged óóÀơ ơ ÀÀÀóÀ óÀơ Àơ ụ ụ ụ úúú â íĐđÃạáơ ịđÃơÃ-á ơẳđẳ- ì-ơÃơôơà BS I 2 Fe b ruary 05 ẻằđẳôẵằẳ ắĐ ì ỉ ôẳằđ Ãẵằ-ằ âÃơá ịì ú ậ ẵơđằẳ íĐ ề đằđẳôẵơà đ ằơâđàÃạ ằđÃơơằẳ âÃơáôơ Ãẵằ-ằ đ ì ỉ ềơ đ ẻằ-ằ B S A 93 : 0 S ubc laus e óóÀô ô ô ÀÀÀóÀ óÀô ô Àô ô Àô Àô ô Àóóó C ract e ris ti c M ate rials D i me nsio ns Ge ner al Th reads S qu arene ss 4 M anu factur e 4 Nu t b odie s 4 H eat tr eatme nt 4 S urfac e textu re 4 S urfac e p r o te cti o n 4 a Lu bri catio n T e chn ic al re qu i re me nt Ins p e cti on and te s t me tho d a S amp le s iz e Q/A The nut shall be made from the material specified by the nut standard or drawing As stated in the material specification The dimensions of the finished nut shall comply with the nut standard or drawing All dimensions shall be Q controlled by the manufacturers quality A system The threads shall comply with the requirements specified by the nut standard or drawing Q 60 (100 %) A Table and Table Q 60 (100 %) A Table and Table The surface texture shall BS 1134 be as specified by the nut standard or drawing prior to protective treatment Q A Table and Table Surfaces shall be coated Relevant coating as specified by the nut specification standard or drawing Q A Table and Table Surfaces shall be coated Relevant coating as specified by the nut specification standard or drawing Q A Table and Table The bearing surface of Bearing surface the nut shall be square to squareness test, the axis of the thread BS 2A 295:2000 within the tolerance specified by the nut standard or drawing Nut bodies shall be produced by machining from bar or by a hot or cold forging process of 60 (100 %) Table and Table The method of manufacture shall be defined by control documentation to the satisfaction of the appropriate airworthiness authority The parts shall be heat treated as necessary, to satisfy the requirements of this specification Q is the qualification approval test requirement and A is the production acceptance test requirement íĐđÃạáơ ịđÃơÃ-á ơẳđẳ- ì-ơÃơôơà ẻằđẳôẵằẳ ắĐ ì ỉ ôẳằđ Ãẵằ-ằ âÃơá ịì ú ậ ẵơđằẳ íĐ ề đằđẳôẵơà đ ằơâđàÃạ ằđÃơơằẳ âÃơáôơ Ãẵằ-ằ đ ì ỉ â BSI 22 February 2005 ềơ đ ẻằ-ằ BS 2A 293:2005 Subclause Characteristic 4.5 Metallurgical properties 4.5 Discontinuities 4.5 Magnetic permeability and residual magnetism (applicable to corrosion resisting steel nuts only) Technical requirement Insp ection and test method Q/Aa Nuts shall be examined for discontinuities Nuts having discontinuities exceeding the limitations specified in Table shall be rejected Non-corrosion resisting Q steel nuts shall be magnetically inspected A by both longitudinal and circular methods The combined method is permissible Care shall be exercised to avoid confusing cracks with other discontinuities (see 1 ) Cracked parts shall be rejected Nuts made from non-magnetic material shall be subjected to a visual examination of magnification 10 The magnetic permeability of corrosion resisting steel nuts shall be as specified in the material specification of the product Residual magnetism shall not exceed 0.5 gauss Sample size 60 (100 %) Table and Table A Parts showing indications which are considered cause for rejection shall be subjected to metallographic examination at a magnification of 100 Table 9, column B Magnetic field indicator Q of suitable calibration, used in accordance with A the manufacturers instructions Table 9, column B NOTE The same test sample may be utilized for more than one test provided that none of the characteristics of the sample are altered during the examination procedure a Q is the qualification approval test requirement and A is the production acceptance test requirement óóÀơ ơ ÀÀÀóÀ óÀơ Àơ Àơ Àơ Àóóó â BSI 22 February 2005 íĐđÃạáơ ịđÃơÃ-á ơẳđẳ- ì-ơÃơôơà ẻằđẳôẵằẳ ắĐ ì ỉ ôẳằđ Ãẵằ-ằ âÃơá ịì ú ậ ẵơđằẳ íĐ ề đằđẳôẵơà đ ằơâđàÃạ ằđÃơơằẳ âÃơáôơ Ãẵằ-ằ đ ì ỉ ềơ đ ẻằ-ằ B S A 93 : 0 S ubc laus e C ract e ris ti c T e chn ic al re qu i re me nt Ins p e cti on and te s t me tho d a S amp le s iz e Q/A P r oduct p e rformance Axial te ns ile Nuts shall withstand the s tr ength minim um te nsile lo ad app ro priate t o the ir strength clas sificatio n as defined in the nut standa rd o r draw ing, and as s p ecifie d in Tab le 4 P er mane nt s et Nuts shall s upp ort the o f BS A 5: 0 re le vant axial tens ile This test shall b e Q A Table , co lumn B Q A Nil Q 10 A Nil o f BS A 5: 00 Q 10 o f BS A 5: 0 A Tab le 9, c olumn B strength load w it ho ut c arried o ut at amb ie nt rup ture te mp e rature The nut shall n ot e xc ee d 1 o f BS A 5: 00 the maximum p ermis sib le lo cking torque during asse mb ly o nto a maxim um mandre l as s p ecifie d in Tab le D uring re moval from a minim um m andre l the nut shall no t e xhib it a b re akaw ay torque less than that s p ecifie d in Tab le 6 Acceler ate d Nuts shall me et the e nvi ronmental minimum b re akaway r eusab ility o f BS A 5: 00 torque and the maximum lock ing to rque sp ec ifie d in Tab le aft er e ac h of fo ur cycles o f loa ded heat so ak E ach cyc le s hall co ns ist of s ix ho urs at minim um o perating te m pe rature fo llo we d b y six ho urs at max im um o pe rating te m pe rature R e u sab ility Qu alifi cati on Nuts shall be capable of accep tance 0 c ycles o f re use w itho ut exhib iting lock ing to rques o uts ide the range s pe cifie d in Tab le Te st s hall be carried out o n nuts in the re ce ive d as c ondition P r oductio n Nuts shall be capable of accep tance c yc le s o f reus e without e xhib iting loc king to rques outs ide th e range sp ec ified in T ab le a Q is th e qua lificatio n ap p ro val te st re quire m e nt an d A is the pro ductio n acce pta nce te st re q uire m e nt óóÀơ ơ ÀÀÀóÀ óÀơ ụ ụ ụ ụ ụ ụ úúú ịđÃơÃ-á ơẳđẳ- ì-ơÃơôơà íĐđÃạáơ ẻằđẳôẵằẳ ắĐ ì ỉ ôẳằđ Ãẵằ-ằ âÃơá ịì ú ậ ẵơđằẳ íĐ ề đằđẳôẵơà đ ằơâđàÃạ ằđÃơơằẳ âÃơáôơ Ãẵằ-ằ đ ì ỉ â ềơ đ ẻằ-ằ BS I 2 Fe b ruary 05 BS A 93 : 0 S ub c lau s e C rac te ri s ti c C ontami natio n Te c hni ca l r e qui re men t In sp ec ti on and te s t me t ho d Nut s s hall b e imme rse d Q/A a S amp le s iz e b Q A Nil Q A Nil Q A Nil in the co ntam inants spe c ifie d in Tab le for the s pec ifie d tim es and at the s p e cified te m perat ures A se parate nut s hall b e used for each co ntaminant Half an hour a ft er the im me rsio n p erio d the nut s shall b e te s ted to de monstrate c om pliance with the reusab ility require me nts o f Br eakaw ay óó À ơ À À À ó À ó À ô ô À ô ô À ô À ô ô À ó ó ó tor qu e after heat so ak At maximum Nuts shall m e et the o f o p er ati ng minimum breakaw ay BS A : 20 0 te mp er ature to rque sp ec ifie d in Tab le after an e ight hour he ating pe riod co ns isting of tw o hours at maximum s oak te mpe rat ure fo llow ed b y six ho urs at maximum op e rating temp e rature , the b re akaway to rque b eing mea sure d at maxim um o pe rating te mpe rat ure and again at am b ie nt tem perat ure At mini mu m Nuts shall m e et the o f o p er ati ng minimum breakaw ay BS A : 20 0 te mp er ature to rque sp ec ifie d in Tab le after an e ight hour he ating pe riod co ns isting of tw o hours at maximum s oak te mpe rat ure fo llow ed b y six ho urs at minimum op e rating temp e rature , the b re akaway to rque b eing mea sure d at minimum op era ting te mpe rat ure and again at am b ie nt tem perat ure a b Q is the qua lifica tio n a p p roval te st re quire m ent an d A is the p ro ductio n acce pt ance te s t req uire m e nt O ne nut p er tam ina nt â íĐđÃạáơ ịđÃơÃ-á ơẳđẳ- ì-ơÃơôơà BS I 2 Fe b ruary 05 ẻằđẳôẵằẳ ắĐ ì ỉ ôẳằđ Ãẵằ-ằ âÃơá ịì ú ậ ẵơđằẳ íĐ ề đằđẳôẵơà đ ằơâđàÃạ ằđÃơơằẳ âÃơáôơ Ãẵằ-ằ đ ì ỉ ềơ đ ẻằ-ằ BS 2A 293:2005 Subclause 4.6.7 Characteristic Accelerated vibration (app licable only to thread sizes MJ5 to MJ12) Technical requirement A n ut asse mbled to Inspection and test metho d 3.1 Sample size Q/A a o f BS A 5: 00 sta ndard b o lt and tighte ned to the as sem b ly torque value s s pe cified in Tab le s hall w it hst and 0 0 cycles continuo us vib ration at frequenc y H z and pe ak to p eak am plitude 1 mm w itho ut re lative ro tat io n e xce eding 60 or crack ing of the nut 4.6.7.1 At ambient temperature C o mp lia nce s hall be Taking into acc ount the dem o ns trate d at am bie nt cap acity o f vib ration te m pe rature m achines , t his te st ap plies o nly to nuts of Q A Nil Q A Nil diam ete r , , , 8, and mm Fo r nuts of diffe re nt diam ete r, the cap ability o f re sisting vib ration is e valuated from result s o bt aine d on one or m o re o f the afo reme ntione d diam ete rs , o n co ndition t hat the se nuts are of ide ntic al de sign and m anufa cture 4.6.7.2 At ambient temperature after heat soak at maximum operating temperature C o mp lia nce s hall be Taking into acc ount the dem o ns trate d at am bie nt cap acity o f vib ration te m pe rature after heat m achines , t his te st so ak o f six hours at ap plies o nly to nuts of maxim um o pe rating te m pe rature ± C diam ete r , , , 8, and mm re m o ving and re asse mb ling fo ur additional times and tighte ning to the ass e mb ly torque s sp ec ified in T ab le Fo r nuts of diffe re nt diam ete r, the cap ability o f re sisting vib ration is e valuated from result s o bt aine d on one or m o re o f the afo reme ntione d diam ete rs , o n co ndition t hat the se nuts are of ide ntic al de sign and m anufa cture a Q is th e qua lificatio n ap p ro val te st re quire m e nt an d A is the pro ductio n acce pta nce te st re q uire m e nt © óóÀơ ô ô ÀÀÀóÀ óÀô ô Àô ô Àô Àô ô úúú ịđÃơÃ-á ơẳđẳ- ì-ơÃơôơà íĐđÃạáơ ẻằđẳôẵằẳ ắĐ ì ỉ ôẳằđ Ãẵằ-ằ âÃơá ịì ú ậ ẵơđằẳ íĐ ề đằđẳôẵơà đ ằơâđàÃạ ằđÃơơằẳ âÃơáôơ Ãẵằ-ằ đ ì ỉ ềơ đ λ-¿´» BS I 2 Fe b ruary 05 BS A 93 : 0 5 Q uality As surance and pro duct qu alification te s ting app ro vals Quali ty As su r ance ap p ro val The nut manufacturers shall have a Quality Management System in accordance with the requirements of BS E N 91 00 NO TE Product certific ation /insp ection /testing Users of this British Standard are advised to consider the desirability of third-party certification/inspection/testing of p roduct conformity with this British Standard Users seeking assistance in identifying app ropriate conformity assessment bodies or schemes may ask BSI to forward their enquiries to the relevant association NO TE The prime contrac tor, in the context of this British Standard, may also be the design authority Pr o du ct qu ali ficati o n testing ap pr oval 5.2.1 Product qualification testing shall be in accordance with Clause of this Britis h Standard A delegated representative accep table to the des ign authority (who may be the prime contractor) s hall indep endently witnes s p roduct qualification testing Records of this product qualification testing shall be retained by the manufacturer and form part of the Quality Assurance records 5.2.2 O nce qualified, the manufacturing route shall be sealed and not changed without the agreement of the qualification body, who might require re- qualification to re- es tablis h manufacturing route compliance to specification C las si fi catio n of te s ts 5.3.1 General The inspection and tes ting of nuts shall be classified as follows: a) product qualification ap proval tests (s ee b) production acceptance tests (see óóÀơ ơ ÀÀÀóÀ óÀô ô Àô ô Àô Àô ô Àóóó 5.3.2 ); and ) Production qualification approval test samples The qualification approval tes t samp les shall consist of nuts for each diameter, to be qualification tes ted as specified in Table The number of sample nuts for each test is listed in C lause against the tes t requirement for qualification (Q) At the option of the qualification authority, qualification of one part number may be accepted as covering nuts of adj acent diameters provided that the manufacturing method is identical 5.3.3 Production acceptance tests General Production acceptance tests shall be carried out for each insp ection lot ( ) The production acceptance tests shall consist of all the tests specified for acceptance (A) in C lause The clas sification of defects for nuts for the visual and dimensional non- destructive tests shall be as given in Table D efects not classified in Table shall be classified as minor B defects All dimensional characteristics shall be considered defective when out of tolerance The sample units for the metallurgical non- destructive tes ts may be selected from those that have been subj ected to and p assed the visual and dimensional inspection, with additional units selected at random from the inspection lot as necess ary The sample units for destructive tests may be selected from those that have been subj ected to and passed the non- destructive tests with additional units selected at random from the inspection lot as necessary Rejection and re- test Lots found unacceptable shall be re- submitted for re- ins pection only after all the units are re- examined or re- tested and all defective units are removed or defects corrected Before the inspection lot is re- submitted, full particulars concerning the cause of the previous rej ection and the action taken to correct the defects found in the ins pection lot shall be recorded Twice the normal sample size s hall be used in the case of destructive tests in lots previously found unacceptable The s ame acceptance level shall be used Lots re- submitted and found unacceptable shall be destroyed â íĐđÃạáơ ịđÃơÃ-á ơẳđẳ- ì-ơÃơôơà BSI 22 February 2005 ẻằđẳôẵằẳ ắĐ ì ỉ ôẳằđ Ãẵằ-ằ âÃơá ịì ú ậ ẵơđằẳ íĐ ề đằđẳôẵơà đ ằơâđàÃạ ằđÃơơằẳ âÃơáôơ Ãẵằ-ằ đ ì ỉ ềơ đ ẻằ-ằ BS A 93 : 0 Packi ng, packaging and labe lli ng Preve nti on of damage The nuts s hall be pac ked so as to p re ven t damage and c orro sion during handling, trans po rtatio n and s to rage Uni t package Unit p ackage s shall cont ain o nly faste ners o f the same p art num be r and p ro duc tio n lot numb e r Labelli ng E ach individual package of nuts s ll have the co mp le te part numb e r, quant ity, pro duc tio n lot num b er and insp ec tor s stamp c le arly show n on the lab el Inspection The manufac turer is re s po ns ib le for the pe rfo rmanc e o f all ins pec tion re quire m ents as sp e cified here in E ach m anufacture r shall us e his ow n or, exce ptio nally, any ot he r facilitie s for ap pro val in acc ordance w ith and fo r the imple m e ntat io n o f thes e insp ec tio n re quire ments Prod uctio n acceptance test report A productio n ac cep tance te st re po rt s how ing actual numeric al value s s hall be p ro vided at the p urchas e r s o ptio n as part o f the te rms o f the p urc has e orde r The manufacturer shall also provide e vide nc e that p roduct qualific ation t esting app ro val has be e n granted in ac co rdance with óóÀơ ơ ÀÀÀóÀ óÀơ Àơ ụ ụ ụ ụ úúú 10 íĐđÃạáơ ịđÃơÃ-á ơẳđẳ- ì-ơÃơôơà ẻằđẳôẵằẳ ắĐ ì ỉ ôẳằđ Ãẵằ-ằ âÃơá ịì ú ậ ẵơđằẳ íĐ ề đằđẳôẵơà đ ằơâđàÃạ ằđÃơơằẳ âÃơáôơ Ãẵằ-ằ đ ì ỉ â ềơ đ ẻằ-ằ BS I 2 Fe b ruary 05 â íĐđÃạáơ ịđÃơÃ-á ơẳđẳ- ì-ơÃơôơà BS I 2 Fe bruary 20 05 ẻằđẳôẵằẳ ắĐ ì ỉ ôẳằđ Ãẵằ-ằ âÃơá ịì ú ậ ẵơđằẳ íĐ ề đằđẳôẵơà đ ằơâđàÃạ ằđÃơơằẳ âÃơáôơ Ãẵằ-ằ đ ì ØÍ Tab le T y p e o f te s t C h arac te ri st ic Q u ali ficatio n ap p ro val tes ti n g re qu i reme n ts fo r se lf-lo cki ng n ut s amp le s S u b c la u s e N u t sam p le 1 1 2 2 3 3 3 4 4 4 45 5 5 17 U n- 26 28 34 35 36 37 38 54 5 59 60 C o a te d co at e d N o n - d es tru c tiv e D im en s ion s 4.3 S u r fac e text ur e 4.4.3 S u r fac e p r ot ec tio n 4.4.4 L u b ric atio n 4.4.5 D is c on t in uitie s 4.5.1 M agn e tic 4.5.2 p er m e a b il ity D e s t ru c tiv e Ax ial ten s ile tes t 4.6.1 P e r m an en t s e t 4.6.2 A cc e le te d 4.6.3 ềơ đ λ-¿´» e n v iro n m e n tal r e us ab ilit y R eu s ab ility 4.6.4 C o n t am in atio n 4.6.5 B re a kaw ay to rq u e 4.6.6 afte r h e at s oa k A cc e le te d 4.6.7 v ib r atio n BS A 293:2005 11 óóÀơ ơ ÀÀÀóÀ óÀơ Àơ Àơ Àơ Àóóó B S A 93 : 0 óóÀô ô ô ÀÀÀóÀ óÀô ô Àô ô Àô Àô ô Àóóó Tab le T yp e of te s t Quali ficatio n and p r o duction accep tance tes ts C har acte r is ti c Qu ali fic ati o n S ubc laus e Non- destructive D im ensions S amp le si z e Acce p ta nce S ub c laus e 60 S ampl e s iz e Tab le and Tab le Surface t exture 4 3 4 Tab le and Tab le Surfac e p ro tec tion 4 4 4 Tab le and Tab le Lub ricat ion 4 4 Tab le and Tab le D is co ntinuitie s 60 Magne tic; Tab le and Tab le Mic ros co pic ; Tab le , co lum n B D e struc tive Magne tic p erme ab ility Tab le , co lum n B Axial te nsile stre ngth Tab le , co lum n B Pe rmane nt se t Ac ce lerate d environme nta l 10 10 Tab le , co lum n B re us abilit y Re us ab ilit y C o nt amina tio n 5 Bre akaway to rque afte r 10 heat s oak Acc elerat ed vib ratio n at amb ient te mpe rature Acc elerat ed vib ratio n at amb ient te mp e rature aft er heat s oak at m inim um op erating te m perat ure Tab le D is continuity de p ths T hre ad no mi nal d i ame te r Di s co n ti nu it y d ep t hs Nut s mad e from s he e t me tal mm Nu ts mad e fro m bar o r w i re mm mm and s maller 10 30 12 2 35 14 39 and larger 0 44 12 íĐđÃạáơ ịđÃơÃ-á ơẳđẳ- ì-ơÃơôơà ẻằđẳôẵằẳ ắĐ ì ỉ ôẳằđ Ãẵằ-ằ âÃơá ịì ú ậ ẵơđằẳ íĐ ề đằđẳôẵơà đ ằơâđàÃạ ằđÃơơằẳ âÃơáôơ Ãẵằ-ằ đ ì ỉ â ềơ đ ẻằ-ằ BS I 2 Fe b ruary 05 BS 2A 293:2005 Table Axial load values 100 % axial load test Thread size Cross-sectional area, S, to be tested mm MJ3 450 MPa class ( B) Full Thin kN kN 439 56 Axial tensile load 650 MPa class ( B) Full Thin kN 3 kN 900 MPa class ( B) Full Thin kN kN 3.1 MJ4 51 71 5.59 MJ5 296 49 98 8 97 MJ6 21 753 37 13 52 74 MJ8 41 682 8 12 22 25 6.25 37 24 38 MJ10 25 65 36 29 05 39 25 42 58 38 09 MJ12 25 97 28 43 28 41 58 37 87 56 81 MJ14 31 562 59 38 48 78 51 29 11 76 96 MJ16 75 613 79 51 35 05 68 51 15 1 02 77 MJ18 225 949 01 66 10 35 88 14 20 32 21 MJ20 282 571 27 82 68 69 101 18 254 65 30 The cross- sectional area taken into consideration to calculate the axial load to be applied to a nut is the same as that of a bolt with an identical diameter and pitch The formula for this cross- sectional area, S, is : S = d3 2 d3 d2 where S d d is the cross -s ectional area (in mm ); is the maximum thread flank diameter of the bolt in accordance with BS A 358- (in mm); is the maximum root diameter of the bolt in accordance with BS A 358- (in mm) Axial tensile load for full nuts f L f is calculated by the formula: B and axial tensile load for thin nuts t 65 L t is calculated by the formula: B where S B is the cross-s ectional area (in mm ); is the strength classification (in MPa) óóÀơ ơ ÀÀÀóÀ óÀơ Àơ Àơ ụ ụ úúú â íĐđÃạáơ ịđÃơÃ-á ơẳđẳ- ì-ơÃơôơà BSI 22 February 2005 ẻằđẳôẵằẳ ắĐ ì ỉ ôẳằđ Ãẵằ-ằ âÃơá ịì ú ậ ẵơđằẳ íĐ ề đằđẳôẵơà đ ằơâđàÃạ ằđÃơơằẳ âÃơáôơ Ãẵằ-ằ đ ì ỉ 13 ềơ đ ẻằ-ằ BS 2A 293:2005 Type of nut Full nut Thin nut Maximum assembly and wrench torque test values Thread size 450 MPa class Wrench Maximum torque assembly torque Nm 650 MPa class Wrench Maximum torque assembly torque Nm Nm Nm 900 MPa class Wrench Maximum torque assembly torque Nm Nm Maximum locking torque Nm MJ3 MJ4 MJ5 1.5 3.1 4.6 3.0 6.2 9.2 1.7 3.7 5.4 3.4 7.4 10.8 2.1 4.5 5.7 4.2 9.0 11.4 0.8 1.6 1.8 MJ6 MJ8 MJ10 8.1 18.0 28.5 16.2 36.0 57.0 9.6 18.0 35.3 19.2 36.0 70.6 9.9 24.7 48.9 19.8 49.4 97.8 3.2 6.0 9.5 MJ12 MJ14 MJ16 45.0 67.1 100.7 90.0 134.2 201.4 61.4 97.0 145.4 122.8 194.0 290.8 85.0 134.3 201.4 170.0 268.6 402.8 15.0 22.0 33.0 MJ18 MJ20 MJ3 MJ4 MJ5 145.4 201.6 1.1 2.3 3.2 290.8 403.2 2.2 4.6 6.4 210.0 291.2 1.3 2.7 3.9 420.0 582.4 2.6 5.4 7.8 290.7 403.2 1.5 3.1 4.6 581.4 806.4 3.0 6.2 9.2 44.0 50.0 0.8 1.6 1.8 MJ6 MJ8 MJ10 5.7 12.2 21.7 11.4 24.4 43.4 6.8 14.9 27.2 13.6 29.8 54.4 8.1 18.0 28.5 16.2 36.0 57.0 3.2 6.0 9.5 MJ12 MJ14 MJ16 36.3 55.6 83.3 72.6 111.2 166.6 45.0 66.0 99.0 90.0 132.0 198.0 45.0 67.1 100.7 90.0 134.2 201.4 15.0 22.0 33.0 MJ18 116.7 233.4 132.0 264.0 145.4 296.8 44.0 MJ20 150.0 300.0 150.0 300.0 201.6 403.2 50.0 Maximum assembly torque values on full nuts are calculated to induce 50 % of the ultimate tensile stress (UTS) On thin nuts, maximum assembly torque values are calculated to induce 25 % of UTS Where the calculated maximum assembly torque is less than three times the maximum locking torque, the maximum assembly torque is adjusted to the calculated value plus the maximum locking torque, except where this value exceeds three times the maximum locking torque, in which case three times the maximum locking torque is the value used w where t t w is the wrench torque (in N m); is the maximum assembly torque (in N m) 14 íĐđÃạáơ ịđÃơÃ-á ơẳđẳ- ì-ơÃơôơà ẻằđẳôẵằẳ ắĐ ì ỉ ôẳằđ Ãẵằ-ằ âÃơá ịì ú ậ ẵơđằẳ íĐ ề đằđẳôẵơà đ ằơâđàÃạ ằđÃơơằẳ âÃơáôơ Ãẵằ-ằ đ ì ỉ â BSI 22 February 2005 ềơ đ ẻằ-ằ úúụ ụ ụ ú úụ ụ ụ ụ Àơ Àơ Àóóó Table BS 2A 293:2005 óóÀơ ô ô ÀÀÀóÀ óÀô ô Àô ô Àô Àô ô Àóóó Table Maximum locking torque, minimum breakaway torque, assembly torque (vibration) , push out and torque out values Thre ad size Maximum locking torque Ambient temperature a Minimum breakaway Assembly torque (vibration test) c torque At ambient temperature after heat soakb Nm MJ6 MJ8 MJ10 3.20 6.00 9.50 6.40 12.00 19.00 0.35 0.70 1.20 6.40 12.00 19.00 MJ12 MJ14 MJ16 15.00 22.00 33.00 30.00 44.00 66.00 1.80 2.60 3.70 30.00 44.00 66.00 MJ18 MJ20 44.00 50.00 88.00 100.00 4.90 6.30 88.00 100.00 b c 0.10 0.15 0.25 Nm 0.80 1.60 1.80 a 1.60 3.20 3.60 Nm MJ3 MJ4 MJ5 1.60 3.20 3.60 Nm Maximum locking torque at ambient temperature is based on reasonable manufacturing tolerance but not less than one third of assembly torque (Table 5) (5 0.8 slightly exceeds one third of the maximum assembly torque) Maximum locking torque after heat soak is double the maximum locking torque at ambient temperature Assembly torque (vibration test) is double the maximum locking torque at ambient temperature Table Cate gory Maj or C A 2.5 B 4.0 B Minor % 0.065 0.4 1.0 A C lassification of defects AQL C haracteristic Penetrant flaw detection Visual examination of locking element Thread size Squareness of bearing surface to threads Surface protection Lubrication Shank diameter Clinch nuts Shank length Rivet hole diameter Rivet hole location Wrench size and configuration Nut height Diameter of bearing surface Float Burrs and sharp corners Depth of counter bore Coaxiality wrench form to thread diameter Coaxiality wrench diameter to thread diameter 15 © BSI 22 February 2005 íĐđÃạáơ ịđÃơÃ-á ơẳđẳ- ì-ơÃơôơà ẻằđẳôẵằẳ ắĐ ì ỉ ôẳằđ Ãẵằ-ằ âÃơá ịì ú ậ ẵơđằẳ íĐ ề đằđẳôẵơà đ ằơâđàÃạ ằđÃơơằẳ âÃơáôơ Ãẵằ-ằ đ ì ỉ ềơ đ ẻằ-ằ BS 2A 293:2005 Table Sampling data for visual and dimensional characteristics Production lot or inspection lot size Sample size (n ) 91 to 50 13 91 to 50 20 151 to 80 32 281 to 500 50 50 to 200 80 01 to 00 25 01 to 0 00 00 00 to 35 000 00 to 50 000 50 001 to 00 000 800 AQL 0.065 % AC LQ % AQL 0.4 % AC LQ % AQL 1.0 % AC LQ % AQL 2.5 % AC LQ % AQL 4.0 % AC LQ % 20 1 2 80 70 80 56 90 5 1 30 3.1 35 42 10 30 2 6 64 10 70 14 10.1 31 2.1 74 14 39 21 95 500 1.86 10 08 21 64 1 00 1 20 AC = Accep t ance n um b e r U se sa mp ling p lan ab ove Us e sa m p ling p lan b e lo w NO TE Sa mp ling det ails have b ee n e xtracte d fro m B S 60 01 Table Sampling data for mechanical and metallurgical characteristics Production lot or inspection lot size Up to 00 Sample size ( n) Non-destructive Destructive A B Acceptance number (AC) 13 to 00 20 5 0 and o ve r 32 01 to 0 Contaminant Table 10 Contaminants Relevant specification Time Immersion Temperature C h E ngine fuel D ef S tan - 88/Iss ue D e - ic ing fluid BS - Hydraulic fluid, m ineral b ase d D ef S tan - 48 Hydraulic fluid, sphate este r D TD 90 /4 881 D E ngine oil 24 a a D ef S tan - 00 /Issue a 45 24 45 24 70 24 70 24 70 O b tain ab le fro m U K D e fence S ta ndardiz at io n, Ro o m 1 8, Ken tige rn H ous e , 65 Bro wn S tre e t, Glas go w G 8E X óóÀơ ơ ÀÀÀóÀ óÀô ô Àô ô Àô Àô ô Àóóó a a 16 íĐđÃạáơ ịđÃơÃ-á ơẳđẳ- ì-ơÃơôơà ẻằđẳôẵằẳ ắĐ ì ỉ ôẳằđ Ãẵằ-ằ âÃơá ịì ú ậ ẵơđằẳ íĐ ề đằđẳôẵơà đ ằơâđàÃạ ằđÃơơằẳ âÃơáôơ Ãẵằ-ằ đ ì ỉ â ềơ đ λ-¿´» BS I 2 Fe b ruary 05 BS 2A 293:2005 Annex A (normative) 25, M1 Axial loads and torque values for thread sizes M8 and M1 The maximum as sem b ly and w re nch torque te st value s, and axial lo ad values fo r t hre ad size s M8 M1 and M1 Maximum assembly and wrench torque test values for thread sizes M8 Thread Nominal 25 , M10 450 MPa class Pitch diameter mm óóÀơ ơ ÀÀÀóÀ óÀơ ô Àô ô Àô Àô ô Àóóó Thin nut 650 MPa class 900 MPa class Wrench Maximum Wrench Maximum Wrench assembly torque assembly torque asse mbly torque N m N m 34 locking torque torque torque N m 17 Maximum N m N m 36 N m 2 45 N m 0.0 5 3 66 45 91 5 45 90 1 6 80 61 25 11 23 4 2 4 0.0 21 42 2 5 2.0 2 44 82 45 0 Thread Axial load values for thread sizes M8 Tensile Pitch mm mm 1.25 , M10 1.5 and M1 1.5 Axial tensile load stress area diameter mm 1.5 2.0 Table A.2 Nominal mm 25 and M12 Maximum torque Full nut 25, are give n in Table A and Table A re sp ec tive ly Table A.1 Type o f nut 45 MPa class 65 MPa class 900 MPa class Full Thin Full Thin Full Thin kN kN kN kN kN kN 25 40 26 36 10 50 64 8 4 41 20 57.6 28 12 50 50 21 62 31 86 43 â íĐđÃạáơ ịđÃơÃ-á ơẳđẳ- ì-ơÃơôơà BS I 2 Fe b ruary 05 ẻằđẳôẵằẳ ắĐ ì ỉ ôẳằđ Ãẵằ-ằ âÃơá ịì ú ậ ẵơđằẳ íĐ ề đằđẳôẵơà đ ằơâđàÃạ ằđÃơơằẳ âÃơáôơ Ãẵằ-ằ đ ì ỉ 17 ềơ đ ẻằ-ằ óóÀô ô ô ÀÀÀóÀ óÀô ô Àô ô Àô Àô ụ úúú 18 íĐđÃạáơ ịđÃơÃ-á ơẳđẳ- ì-ơÃơôơà ẻằđẳôẵằẳ ắĐ ì ỉ ôẳằđ Ãẵằ-ằ âÃơá ịì ú ậ ẵơđằẳ íĐ ề đằđẳôẵơà đ ằơâđàÃạ ằđÃơơằẳ âÃơáôơ Ãẵằ-ằ đ ì ỉ blank ềơ đ ẻằ-ằ BS 2A 293:2005 Bibliography , Sam pling proce dures and tab les for ins pec tion b y attrib ut es óó À ơ À À À ó À ó À ơ À ô À ô À ô ô À ó ó ó BS 6001 19 â BSI 22 February 2005 íĐđÃạáơ ịđÃơÃ-á ơẳđẳ- ì-ơÃơôơà ẻằđẳôẵằẳ ắĐ ì ỉ ôẳằđ Ãẵằ-ằ âÃơá ịì ú ậ ẵơđằẳ íĐ ề đằđẳôẵơà đ ằơâđàÃạ ằđÃơơằẳ âÃơáôơ Ãẵằ-ằ đ ì ỉ ềơ đ ẻằ-ằ BS 2A 293:2005 BSI British Standards Institution BSI is the independent national body responsible for preparing British Standards It presents the UK view on standards in Europe and at the international level It is incorporated by Royal Charter Revisions British Standards are updated by amendment or revision Users of British Standards should make sure that they possess the latest amendments or editions It is the constant aim of BSI to improve the quality of our products and services We would be grateful if anyone finding an inaccuracy or ambiguity while using this British Standard would inform the Secretary of the 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