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raising standards worldwide™ NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW BSI Standards Publication AEROSPACE SERIES Specifcation for Hexagon self‑locking nuts with non‑metal[.]
BS A 275, A 276, A 277, A 278, A 279, A 280:1 981 +A2:201 BSI Standards Publication AEROSPACE SERIES Specifcation for Hexagon sel f‑locking nuts with non‑metallic locking inserts Metric series Série aérospatiale: Spécifcation des écrous hexagonaux auto-blocables avec grains de blocage non métalliques Série métrique Lu ft- und Raum fahrt-Reihe: Spezifkation für Sechskant-Sicherungsmuttern mit nichtmettallischen Sperreinsätzen Metrische Reihe NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW raising standards worldwide ™ BS A 275, A 276, A 277, A 278, A 279, A 280:1 981 +A2:201 BRITISH STANDARD Publishing and copyright in formation The BSI copyright notice displayed in this document indicates when the document was l ast issued © BSI 201 ISBN 978 580 72746 ICS 49.030.30 The foll owing BSI re ferences rel ate to the work on this standard: Committee re ference ACE/1 Dra ft for comment 79/701 24 DC; 0/30234053 DC Publication history First published February 981 Amendments issued since publication Date Text a ffected 30 September 982 See Foreword 31 J anuary 201 See Foreword BRITISH STANDARD BS A 275, A 276, A 277, A 278, A 279, A 280:1 981 +A2:201 Contents Foreword ii Scope Re ferences Performance and procurement General requirements Designation 6 Identifcation and marking Appendices Appendix A Coarse thread pitch series for size codes 080, 00 and 20 Appendix B Foreign materials and fnishes List of fgures Figure – Confguration List of tables Table Table Table Table Table Table Table – Dimensions – Materials – Strengths – M arking – Dimensions – Materials – Strengths Summary of pages This document comprises a front cover, an inside front cover, pages i to ii, pages to 0, an inside back cover and a back cover © BSI 201 • i BS A 275, A 276, A 277, A 278, A 279, A 280:1 981 +A2:201 BRITISH STANDARD Foreword Publishing in formation This British Standard is published by BSI and came into e ffect on 27 February 981 It was prepared by Technical Committee ACE/1 2, Aerospa ce fa steners a nd fa stening systems, deta ils a nd pa rts A list o f organizations represented on this committee can be obtained on request to its secretary Supersession BS A 275, A 276, A 277, A 278, A 279, A 280:1 981 +A2:201 supersedes BS A 275, A 276, A 277, A 278, A 279, A 280:1 981 +A1 :1 982, which is withdrawn Relationship with other publications These British Standards provide a series o f metric, hexagon nuts with non-metallic locking inserts The dimensional data is based on that already agreed in ISO/TC 20/SC 4, Aircra ft and space vehicles – Aerospace fastener systems However, it should be noted that the across f ats dimensions for diameters MJ3, MJ 0, MJ1 and MJ1 are di fferent from the dimensions agreed in ISO/TC 2, Fasteners, for non aerospace use In formation about this document !" #$ The start and fnish o f text introduced or altered by Amendments No and No is indicated in the text by tags and M inor editorial changes are not tagged Contractual and legal considerations This publication does not purport to include all the necessary provisions o f a contract Users are responsible for its correct application Compliance with a British Standard cannot fer immunity from legal obligations ii ã â BSI 201 BRITISH STANDARD BS A 275, A 276, A 277, A 278, A 279, A 280:1 981 +A2:201 1 Scope These British Standards speci fy materials, dimensions, protective treatment, identifcation and marking, together with part numbers for hexagon (thick) sel f-locking nuts, with non-metallic inserts and having MJ screw threads They are primarily intended for use on non-structual aerospace applications and have operational temperature limitations o f −40 °C to +1 20 °C Coarse thread series for size codes 080, 00 and 20 have been included in Appendix A for those users wishing to speci fy them References These standards make re ference to the following standards publications and Ministry o f De fence publications # BS EN 0083 Stainless steel Part Technical delivery conditions for semi-fnished products, bars, rods, wire, sections and bright products o f corrosion resisting steels for general purposes $ BS 1 34 Method for the assessment o f surface texture # Part Method and instrumentation BS EN 21 64 Copper and copper alloys Rod for free machining purposes BS EN 21 33 Cadmium plating o f steels with specifed tensile strength ≤1 450 MPa, copper, copper alloys and nickel alloys BS 3643 ISO metric screw threads # ! A 358 $ MJ Threads Part General requirements Part Limit dimensions for bolts and nuts S 05 $ Carbon steel (bar for the manu facture o f forged bolts only) S 47 0.5 per cent nickel-chromium-molybdenum steel bars for the manu facture o f forged bolts and forged nuts S 54 2½ per cent nickel -chromium-molybdenum steel billets, bars, forgings and parts (880-1 080 MPa; limiting ruling section 50 mm) ! # # " S 58 Specifcation for per cent chromium-molybdenum steel bars for the manu facture o f forged bolts and forged nuts A 293 Procurement o f sel f-locking nuts with non-metallic locking elements Metric Series Specifcation " Ministry of Defence publica tions DEF STAN 03-1 Electro-deposition o f cadmium DEF STAN 03-2 $ $ Cleaning and preparation o f metallic surfaces The latest issue o f these publications shall be used © BSI 201 • BS A 275, A 276, A 277, A 278, A 279, A 280:1 981 +A2:201 BRITISH STANDARD Performance and procurement # $ The nut performance and procurement requirements shall comply with the requirements o f BS A 293 General requirements 4.1 Dimensions All nuts shall form to the dimensions and tolerances given in Table and Figure Unless otherwise specifed, the dimensions shall apply a fter the application o f the protective treatment # $ 4.2 Screw threads The screw threads shall be as given in BS A 358 to the tolerance class specifed in Table 4.3 Materials The materials shall be as given in Table or Appendix B 4.4 Mechanical properties The mechanical properties shall form to those given in Table 4.5 Surface roughness The surface roughness shall be Ra 6.3 mm except where indicated otherwise in Figure and shall be in accordance with BS 1 34 This requirement does not apply to the threads, which shall be as achieved by normal methods o f manu facture Tool marks resulting from the securing o f the non-metallic insert shall be permissible ã â BSI 201 BRITISH STANDARD Figure BS A 275, A 276, A 277, A 278, A 279, A 280:1 981 +A2:201 Confguration ! " NOTE Contour a t ma nufa cturer’s option, but to lie within dimensions quoted NOTE fa ts to intrude on ØM Bea ring surfa ce ma y be fa t to conca ve, but sha ll not be convex NOTE Form of entry to be either cha mfer or dius within limiting dimensions NOTE Brea k sha rp corners mm to mm NOTE Locking insert housing externa l pla nform sha ll lie within the bounda ries of the hexa gona l NOTE No wrenching fea ture After securing the locking insert, the closing dia meter sha ll not be less tha n the nomina l threa d dia meter â BSI 201 ã Dimensions Al l dimensions are in mil limetres Size code D Thread Dia × pitch – Tol class max E F tol G H J K 10 11 L 12 ± 0.3 max max max 13 14 max M 15 N P 16 17 Q 01 M J1 × 0.35 – 4H 6H 3.3 3.2 3.08 2.5 2.3 1 2.2 – – – 0.08 0.1 020 M J2 × 0.4 – 4H 6H 4.2 3.88 2.9 2.7 2.6 2.0 – – – 0.08 0.1 025 M J2.5 × 0.45 – 4H 6H 5.3 4.88 3.6 3.3 3.1 2.5 – – – 0.08 0.1 030 M J3 × 0.5 – 4H 6H 6.5 5.88 2.4 4.1 3.8 2.0 3.6 5.4 0.4 0.2 0.1 0.2 040 M J4 × 0.7 – 4H 6H 7.6 6.85 3.2 5.5 5.1 2.6 4.6 6.4 0.5 0.2 0.1 0.2 050 M J5 × 0.8 – 4H 6H 8.7 7.85 6.7 6.2 3.3 5.6 7.4 0.5 0.2 0.1 0.2 060 M J6 × – 4H5H 0.9 10 9.78 8.1 7.5 3.9 6.8 9.3 0.5 0.2 0.1 0.2 *080 M J8 × – 4H5H 4.3 13 2.73 6.5 9.8 9.0 5.2 8.8 2.2 0.5 0.2 0.1 0.2 *1 00 M J1 × 25 – 4H 5H 8.9 17 6.73 2.3 1 6.5 0.8 10 6.0 0.6 0.3 0.1 0.25 *1 20 M J1 × 25 – 4H 5H 21 19 8.67 10 4.0 2.8 7.8 2.8 12 8.0 0.6 0.3 0.1 0.25 40 M J1 × – 4H 5H 24.5 22 21 67 11 6.4 5.0 9.1 4.8 14 21 0.6 0.3 0.1 0.25 60 M J1 × – 4H 5H 26.8 24 23.67 13 8.1 6.5 0.4 6.8 16 23.0 0.6 0.3 0.1 0.3 80 M J1 × – 4H 5H 30.2 27 26.67 15 9.8 8.0 1 8.8 18 26.0 0.6 0.3 0.1 0.3 200 M J20 × – 4H 5H 33.6 30 29.67 16 21 9.5 3.0 20.8 20 29.0 0.6 0.3 0.1 0.3 * h1 h1 BS A 275, A 276, A 277, A 278, A 279, A 280:1 981 +A2:201 ã â BSI 201 Table For users wishing to speci fy coarse thread pitches for size codes 080, 00 and 20, see Appendix A BRITISH STANDARD Materials Basic Type of material BS number Rockwell A 275 28 to 35 H RC Steel S1 05 !" Hardness* Vickers 280 to 335 H V Nut fnish Insert material Soak † temperature limits Operational temperature limits Cadmium plate and passivate to DEF STAN 03-1 or BS EN 21 33 Nylon type −60 °C to +200 °C −40 °C to +1 20 °C Passivate to DEF STAN 03-2 Method M Nylon type −60 °C to +200 °C −40 °C to +1 20 °C Cadmium plate and passivate to DEF STAN 03-1 or BS EN 21 33 Nylon type −60 °C to +200 °C −40 °C to +1 20 °C # § S1 47 S1 54 S1 58 A 276 Corrosion resisting steel‡ # ! 94 H RB " to 26 H RC ! " 200 to 265 H V X5CrNi1 7-7 $ X5CrNiMo1 7-1 2-2 X6CrNiTi1 8-1 X8CrNiS1 8-9 X5CrNi1 8-1 A 277 Brass # $ — — # $ BS EN 21 64 (CW 61 4N) $ * In the event o f a dispute, the Vickers hardness shal l take precedence † Items shall not be damaged a fter these soak temperature l imits have been applied in accordance with performance and procurement specifcation ‡ According to ! # BS EN 0088 : Part $ § S1 05 is an obsolescent standard and its use is onl y permitted while existing stocks l ast " # BS A 293 $ â BSI 201 ã BS A 275, A 276, A 277, A 278, A 279, A 280:1 981 +A2:201 BRITISH STANDARD Table BS A 275, A 276, A 277, A 278, A 279, A 280:1 981 +A2:201 Table BRITISH STANDARD Strengths Size code D Thread size 01 MJ × 0.35 – 4H 6H 0.91 0.66 0.45 020 MJ × 0.4 – 4H 6H 53 1 0.76 025 MJ 2.5 × 0.45 – 4H 6H 2.57 86 28 030 MJ × 0.5 – 4H 6H 3.88 2.80 94 040 MJ × 0.7 – 4H 6H 6.76 4.88 3.38 050 MJ × 0.8 – 4H 6H 1 8.04 5.56 060 MJ × – 4H 5H 5.70 1 34 7.85 080 MJ × – 4H 5H 31 86 23.00 5.93 00 MJ × 25 – 4H 5H 49.95 36.1 24.97 20 MJ × 25 – 4H 5H 76.40 55.20 38.20 40 MJ × – 4H5H 03.30 74.60 51 65 60 MJ × – 4H5H 40.30 01 30 70.1 80 MJ × – 4H5H 82.90 32.1 91 45 200 MJ 20 × – 4H5H 231 20 67.00 1 5.60 ! Axial tensile strength* kN A 275 (Steel) A 276 (C.R.S.) A 277 (Brass) * When used with bolts o f strength cl assifcation (σB ) 900 MPa for steel, 650 MPa for C.R.S and 450 MPa for brass the axial tensil e strength = where d3 is the core diameter " π d32σ B Designation 5.1 An example o f part number is as follows 5.2 Unassigned part numbers shall not be used Identifcation and marking 6.1 Marking of parts Each nut shall be marked at the position indicated in Figure with the following ã â BSI 201 a) The manu facturer’s monogram b) The minimum data on the f at opposite that bearing the manu facturer’s monogram, as shown in Table BRITISH STANDARD Table BS A 275, A 276, A 277, A 278, A 279, A 280:1 981 +A2:201 Marking Size code Minimum marking Example 01 to 040 No marking (bag and label with complete designation) Not applicable 050 to 080 Last fgure o f basic British Standard number 00 Designation as 5.1 without prefx ‘A’ or size code 277 Designation as 5.1 without size code A277 Complete designation as 5.1 A277-200 20 40 60 80 200 6.2 Method o f marking The marking shall be etched, stamped, or engraved at the manu facturer’s option The impressed characters shall be not greater than 0.25 mm in depth and shall be o f rounded root form The marking shall not have an adverse e ffect on performance â BSI 201 ã Coarse thread pitch series for size codes 080, 00 and 20 A.1 (see This appendix gives the requirements for the manu facture (see A.2 and Tables 5, and 7) and designation A.3 ) of the coarse thread pitch series for size codes 080, 00 and 20 For all other in formation see the previous clauses Table Dimensions All dimensions are in millimetres Size code 080 00 20 D Thread E Dia × pitch − Tol class max M × 25 − 4H 5H 4.3 13 2.73 8.9 17 6.73 21 19 8.67 ! M × − 4H 5H M × − 4H5H " A.2 Table Table F tol h1 10 G H J K ± 0.3 max max 6.5 9.8 9.0 2.3 10 4.0 11 12 L 13 14 15 M N 16 17 P Q max min max 5.2 8.8 2.0 0.5 0.2 0.1 0.2 1 6.5 0.8 10 6.0 0.6 0.3 0.1 0.25 2.8 7.8 2.8 12 8.0 0.6 0.3 0.1 0.25 The screw threads shall be as given in BS 3643 to the tolerance class specifed in Table Materials Basic BS number Type of material A 278 Steel A 279 C.R.S A 280 Brass } Material specifcation See Table Protective treatment See Table or Appendix B BS A 275, A 276, A 277, A 278, A 279, A 280:1 981 +A2:201 ã â BSI 201 Appendix A Strengths Axial tensile strength * kN A 279 (C.R.S.) A 280 (Brass) D Thread size A 278 (Steel) 080 M8 × 25 – 4H 5H 29.0 21 4.5 00 M1 × – 4H 5H 46.3 33.4 23.1 20 M1 × – 4H 5H 71 51 35.9 * See footnote to Tabl e BRITISH STANDARD Size code BRITISH STANDARD BS A 275, A 276, A 277, A 278, A 279, A 280:1 981 +A2:201 A.3 Appendix B Designation A.3.1 An example o f part number is as follows A.3.2 Unassigned part numbers shall not be used Foreign materials and fnishes B.1 General This appendix lists the materials and fnishes that may be substituted for those listed in this standard It is the manu facturer’s responsibility to ensure complete traceability o f the materials used and to guarantee that the part made from these materials satisfes the requirements o f the procurement specifcation in every detail to the satis faction o f the Quality Assurance Authority B.2 Materials B.3 UK material as called for in this standard French alternative S1 54 35NC6 f(AIR 91 60) or # 35CD4S(AIR 91 60) BS EN 21 64 (CW 61 4N) $ UZ39Pb2(AIR 9070) Finishes UK fnish as called for in this standard # # De f stan 03-1 DEF STAN 03-2 BS EN 21 33 $ $ French alternative } AIR 3376 © BSI 201 • BS A 275, A 276, A 277, A 278, A 279, A 280:1 981 +A2:201 1 ã â BSI 201 BRITISH STANDARD This pa ge delibera tely left bla nk This page deliberately left blank British Standards Institution (BSI) BSI is the independent national body responsible for preparing British Standards and other standards-related publications, information and services 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 technical committee responsible, the identity of which can be found on the inside front cover Tel: +44 (0)20 8996 9001 Fax: +44 (0)20 8996 7001 BSI offers Members an individual updating service called PLUS which ensures that subscribers automatically receive the latest editions of standards Tel: +44 (0)20 8996 7669 Fax: +44 (0)20 8996 7001 Email: plus@bsigroup.com Buying standards You may buy PDF and hard copy versions of standards directly using a credit card from the BSI Shop on the website www.bsigroup.com/shop In addition all orders for BSI, international and foreign standards publications can be addressed to BSI Customer Services Tel: +44 (0)20 8996 9001 Fax: +44 (0)20 8996 7001 Email: orders@bsigroup.com In response to orders for international standards, it is BSI policy to supply the BSI implementation of those that have been published as British Standards, unless otherwise requested In formation on standards BSI provides a wide range of information on national, European and international standards through its Knowledge Centre Tel: +44 (0)20 8996 7004 Fax: +44 (0)20 8996 7005 Email: knowledgecentre@bsigroup.com Various BSI electronic information services are also available which give details on all its products and services Tel: +44 (0)20 8996 71 1 Fax: +44 (0)20 8996 7048 Email: info@bsigroup.com BSI Subscribing Members are kept up to date with standards developments and receive substantial discounts on the purchase price of standards For details of these and other benefits contact Membership Administration Tel: +44 (0)20 8996 7002 Fax: +44 (0)20 8996 7001 Email: membership@bsigroup.com Information regarding online access to British Standards via British Standards Online can be found at www.bsigroup.com/BSOL Further information about BSI is available on the BSI website at www.bsigroup.com/standards Copyright Copyright subsists in all BSI publications BSI also holds the copyright, in the UK, of the publications of the international standardization bodies Except as permitted under the Copyright, Designs and Patents Act 988 no extract may be reproduced, stored in a retrieval system or transmitted in any form or by any means – electronic, photocopying, recording or otherwise – without prior written permission from BSI This does not preclude the free use, in the course of implementing the standard of necessary details such as symbols, and size, type or grade designations If these details are to be used for any other purpose than implementation then the prior written permission of BSI must be obtained Details and advice can be obtained from the Copyright & Licensing Manager Tel: +44 (0)20 8996 7070 Email: copyright@bsigroup.com BSI Group Headquarters 389 Chiswick High Road London W4 4AL UK Tel +44 (0)20 8996 9001 Fax +44 (0)20 8996 7001 www.bsigroup.com/standards raising standards worldwide™