BS 3A 1 1 7 1 962+A2 201 6 AEROSPACE SERIES Bolts, Pan Head, Slotted Drive, Unified Threads, Corrosion Resisting Steel, Strength Class 880 MPa, for Aircraft – Specification BSI Standards Publication P[.]
BS 3A 1 7:1 962+A2:201 BSI Standards Publication AEROSPACE SERIES Bolts, Pan Head, Slotted Drive, Unified Threads, Corrosion Resisting Steel, Strength Class 880 MPa, for Aircraft – Specification BRITISH STANDARD BS 3A 1 7:1 962+A2:201 Publishing and copyright information The BSI copyright notice displayed in this document indicates when the document was last issued © The British Standards Institution 201 Published by BSI Standards Limited 201 ISBN 978 580 79484 ICS 49.030.20 The following BSI references relate to the work on this document: Committee reference ACE/1 Drafts for comment AB (ACE) 21 51 , 5/302661 06 DC Amendments issued since publication Date Text affected October 962 Amendment No.1 , (PD 4656) May 201 Amendment No.2, See tags BS 3A 1 7:1 962+A2:201 BRITISH STANDARD Contents Foreword 10 ii Scope Normative references General requirements Material and manufacture Dimensions Screw threads Protective finish Hardness values Identification and marking Inspection procedure List of figures Figure – Dimensions List of tables Table – Materials for manufacture of bolts Table – Dimensions Table – Bearing length L , clamping length M and overall length E Summary of pages This document comprises a front cover, an inside front cover, pages i to ii, pages to 6, an inside back cover and a back cover â ã i BRITISH STANDARD BS 3A 1 7:1 962+A2:201 Foreword Publishing information This British Standard is published by BSI Standards Limited, under licence from The British Standards Institution, and came into effect on 31 May 201 It was prepared by Technical Committee ACE/1 2, Aerospa ce fa steners a nd fa stening systems A list of organizations represented on this committee can be obtained on request to its secretary Supersession BS 3A 1 7:1 962+A2:201 supersedes BS 3A 1 7:1 962 (Incorporating Amendment No :1 962), which is withdrawn Information about this document Amendment No.2:201 introduces the following principle changes: • the addition of high expansion heat resisting steel conforming to BS HR 650, BS EN 2398 and BS EN 2399; • to take account of the mechanical properties of these steels, the introduction of a part number code for bolts made from high expansion heat resisting steels (to be marked on the bolt surface), to distinguish them from bolts made from the BS S 80 material (see Clause ) The start and finish of text introduced or altered by Amendment No.2:201 is indicated in the text by tags Minor editorial changes are not tagged Previous amendments are not indicated Presentational conventions The provisions of this standard are presented in roman (i.e upright) type Its requirements are expressed in sentences in which the principal auxiliary verb is “shall” Commenta ry, expla na tion a nd genera l informa tive ma teria l is presented in sma ller ita lic type, a nd does not constitute a norma tive element Contractual and legal considerations This publication does not purport to include all the necessary provisions of a contract Users are responsible for its correct application Compliance with a British Standard cannot confer immunity from legal obligations ii • © BRITISH STANDARD BS 3A 1 7:1 962+A2:201 Scope This British Standard specifies the materials, dimensions and inspection requirements for corrosion resisting steel pan head bolts (Unified threads), Strength class 880 MPa, for aircraft Normative references thisThedocument following documents, in whole or in part, are normatively referenced in and are indispensable for its application For dated references, only the edition cited applies For undated references, the latest edition of the referenced document (including any amendments) applies BS S 80, High chromium-nickel corrosion resisting steel forging stock, ba rs, forgings a nd pa rts (880 to 080 MPa : limiting ruling section 00 mm) BS 4A 00:2003, Aerospa ce series – Specifica tion for genera l requirements for bolts a nd free running nuts of tensile strength not exceeding 249 MPa BS HR 650, Aerospa ce series – Specifica tion for high expa nsion hea t-resisting steel ba r a nd wire for the ma nufa cture of bolts, studs, set screws a nd nuts (Ni 25 5, Cr 5, Ti 2, Mn 5, Mo 25, Si 7, V 3) (Limiting ruling section 50 mm) BS EN 2398, Aerospa ce series – Hea t resisting steel FE-PA2601 (X6NiCrTiMoV26-1 5) – Rm BS EN 2399, ≥ 900 MPa – Ba rs for ma chined bolts – D ≤ 25 mm Aerospa ce series – Hea t resisting steel FE-PA2601 (X4NiCrTiMoV26-1 5) – Rm ≥ 900 MPa – Ba rs for forged bolts – D ≤ 25 mm BS EN ISO 6506-1 , Meta llic ma teria ls – Brinell rdness test – Pa rt : Test method BS EN ISO 6507-1 , Meta llic ma teria ls – Vickers rdness test – Pa rt : Test method BS EN ISO 6508-1 , Meta llic ma teria ls – Rockwell rdness test – Pa rt : Test method General requirements The bolts shall comply with the relevant requirements of BS 4A 00:2003 in respect of manufacture, screw threads, identification and marking Material and manufacture a) The bolts shall be manufactured by one of the following methods: • machined from bright drawn bars that conform to one of the British Standards specified in Table ; or • forged from material that conforms to one of the British Standards specified in Table b) The materials used for the manufacture of forged bolts shall have the following mechanical properties in the final heat-treated condition: • 0.2% proof stress (min): 590 MPa; • tensile strength (min): 880 MPa; • elongation (min): 2% ; • izod impact (min): 55 J (40 ft·lbf) ) 1) Not applicable to the materials given in BS HR 650, BS EN 2398 and BS EN 2399 © • BS 3A 1 7:1 962+A2:201 BRITISH STANDARD Table – Materials for manufacture of bolts BS No BS S 80 BS HR 650 BS EN 2398 BS EN 2399 Material ⁄2 % nickel-chromium-molybdenum steel High expansion heat-resisting steel High expansion heat-resisting steel High expansion heat-resisting steel Application For the manufacture For the manufacture For the manufacture For the manufacture of of of of machined bolts forged bolts machined bolts forged bolts Dimensions a) b) finished bolts shall conform to the dimensions and tolerances given in All Table and Table 3, and Figure The clamping length of the bolt shall conform to the dimensions and tolerances given in Table , and shall be such that when a standard nut without countersink or a ring gauge without countersink has been screwed on as far as possible by hand, its leading face is within the distance M from the underside of the bolt head The runout of thread shall not exceed twice the pitch c) The nominal length of the bolt shall be the minimum bearing length L , which is determined by the minimum clamping length M, less two thread pitches Screw threads The bolts shall have Unified threads of the form and class of fit specified in the relevant requirements of BS 4A 00:2003 Protective finish A protective finish shall not be applied to the bolts Hardness values BS ENTheISOhardness values of finished bolts shall be as follows; in accordance with 6506-1 (Brinell), BS EN ISO 6507-1 (Vickers) or BS EN ISO 6508-1 (Rockwell ‘C’): a) for machined components: 255 to 321 HBW /30; 26 to 34 HRC; or 270 to 340 HV30 b) for forged components: 248 to 341 HBW /30; 26 to 34 HRC; or 260 to 360 HV30 Identification and marking 9.1 Identification shallThenotBritish Standard identifier and part number (in accordance with Table ) be applied on the bolts, but shall be clearly marked on the labels of parcels of bolts together with the batch identification code • © BRITISH STANDARD BS 3A 1 7:1 962+A2:201 EXAMPLES A1 7-1 D is a bolt with threa d size 32 UNF a nd bea ring length of inches ma nufa ctured in ma teria l conforming to BS S 80; A1 7X1 D is a bolt of the sa me size ma nufa ctured with ma teria ls conforming to BS HR 650, BS EN 2398, or BS EN 2399 9.2 Marking Bolts manufactured with materials conforming to BS HR 650, BS EN 2398, and BS EN 2399 shall be marked with an ‘X’ in accordance with BS 4A 00:2003, Clause Inspection procedure BS 4AThe1 bolts shall be inspected in accordance with the relevant requirements of 00:2003 Figure Dimensions * For bea ring length L, cla mping length M a nd overa ll length E, see Ta ble â ã ã â Thread size (decimal equivalent) in .1 2-40 UNC 38-32 UNC 64-32 UNC 90-32 UNF 250-28 UNF 31 25-24 UNF † Thread size Shank dia 4-40 UNC 6-32 UNC 8-32 UNC 0-32 UNF ⁄4-28 UNF 5/1 6-24 UNF øA max max in in in 0·1 085 0·1 1 0·050 0·1 345 0·1 375 0·063 0·1 605 0·1 635 0·063 0·1 865 0·1 895 0·063 0·2465 0·2495 0·071 0·3090 0·31 20 0·083 Thread Thread Head dia runout length (2× pitch) (F) † in 0·300 0·277 0·327 0·377 0·459 0·497 øB in 0·1 84 0·242 0·273 0·309 0·420 0·527 10 Head thickness D max in 0·1 94 0·252 0·283 0·31 0·440 0·547 in 0·058 0·072 0·085 0·099 0·1 30 0·1 62 max in 0·068 0·082 0·096 0·1 0·1 44 0·1 78 U R nom in 0·042 0·046 0·052 0·061 0·087 0·099 in 0·005 0·005 0·01 0·01 0·01 0·01 max in 0·01 0·01 0·020 0·020 0·030 0·030 14 15 Chamfer depth 16 17 Slot Width 18 G H J in 0·01 0·020 0·020 0·020 0·030 0·030 max in 0·020 0·030 0·030 0·030 0·040 0·040 in 0·031 0·039 0·045 0·050 0·064 0·072 19 Depth ‡ max in 0·039 0·048 0·054 0·060 0·075 0·084 in 0·030 0·037 0·045 0·053 0·070 0·085 max in 0·040 0·050 0·058 0·068 0·087 0·1 06 This dimension is a n a bsolute minimum a ssocia ted with ma ximum length M a nd minimum length E It is not intended for use for ma nufa cturing or inspection purposes ‡ 11 12 13 Radius Underhead around radius head BS 3A 1 7:1 962+A2:201 Table – Dimensions To be mea sured from the top of the hea d to the point a t which the slot brea ks through BRITISH STANDARD BS 3A 1 7:1 962+A2:201 BRITISH STANDARD Table – Bearing length L, clamping length M and overall length E No 4-40 UNC *L Part No Code in ⁄2 A 0·050 1A 0·1 00 2A 0·200 3A 0·300 4A 0·400 5A 0·500 M −0·030 in 0·1 30 0·1 80 0·280 0·380 0·480 0·580 E +0·040 in 0·450 0·500 0·600 0·700 0·800 0·900 No 6-32 UNC *L Part No Code in ⁄2 B 0·050 1B 0·1 00 2B 0·200 3B 0·300 4B 0·400 5B 0·500 M −0·030 in 0·1 43 0·1 93 0·293 0·393 0·493 0·593 E +0·040 in 0·450 0·500 0·600 0·700 0·800 0·900 No 8-32 UNC *L Part No Code in ⁄2 C 0·050 1C 0·1 00 2C 0·200 3C 0·300 4C 0·400 5C 0·500 M −0·030 in 0·1 43 0·1 93 0·293 0·393 0·493 0·593 E +0·040 in 0·500 0·550 0·650 0·750 0·850 0·950 6A 7A 8A 9A 0A 0·600 0·700 0·800 0·900 ·000 0·680 0·780 0·880 0·980 ·080 ·000 ·1 00 ·200 ·300 ·400 6B 7B 8B 9B 0B 0·600 0·700 0·800 0·900 ·000 0·693 0·793 0·893 0·993 ·093 ·000 ·1 00 ·200 ·300 ·400 6C 7C 8C 9C 0C 0·600 0·700 0·800 0·900 ·000 0·693 0·793 0·893 0·993 ·093 ·050 ·1 50 ·250 ·350 ·450 11A 2A 3A 4A 5A ·1 00 ·200 ·300 ·400 ·500 ·1 80 ·280 ·380 ·480 ·580 ·500 ·600 ·700 ·800 ·900 11B 2B 3B 4B 5B ·1 00 ·200 ·300 ·400 ·500 ·1 93 ·293 ·393 ·493 ·593 ·500 ·600 ·700 ·800 ·900 11C 2C 3C 4C 5C ·1 00 ·200 ·300 ·400 ·500 ·1 93 ·293 ·393 ·493 ·593 ·550 ·650 ·750 ·850 ·950 6A 7A 8A 9A 20A ·600 ·700 ·800 ·900 2·000 ·680 ·780 ·880 ·980 2·080 2·000 2·1 00 2·200 2·300 2·400 6B 7B 8B 9B 20B ·600 ·700 ·800 ·900 2·000 ·693 ·793 ·893 ·993 2·093 2·000 2·1 00 2·200 2·300 2·400 6C 7C 8C 9C 20C ·600 ·700 ·800 ·900 2·000 ·693 ·793 ·893 ·993 2·093 2·050 2·1 50 2·250 2·350 2·450 21 A 22A 23A 24A 25A 2·1 00 2·200 2·300 2·400 2·500 2·1 80 2·280 2·380 2·480 2·580 2·500 2·600 2·700 2·800 2·900 21 B 22B 23B 24B 25B 2·1 00 2·200 2·300 2·400 2·500 2·1 93 2·293 2·393 2·493 2·593 2·500 2·600 2·700 2·800 2·900 21 C 22C 23C 24C 25C 2·1 00 2·200 2·300 2·400 2·500 2·1 93 2·293 2·393 2·493 2·593 2·550 2·650 2·750 2·850 2·950 26A 27A 28A 29A 30A 2·600 2·700 2·800 2·900 3·000 2·680 2·780 2·880 2·980 3·080 3·000 3·1 00 3·200 3·300 3·400 26B 27B 28B 29B 30B 2·600 2·700 2·800 2·900 3·000 2·693 2·793 2·893 2·993 3·093 3·000 3·1 00 3·200 3·300 3·400 26C 27C 28C 29C 30C 2·600 2·700 2·800 2·900 3·000 2·693 2·793 2·893 2·993 3·093 3·050 3·1 50 3·250 3·350 3·450 31 A 32A 33A 34A 35A 3·1 00 3·200 3·300 3·400 3·500 3·1 80 3·280 3·380 3·480 3·580 3·500 3·600 3·700 3·800 3·900 31 B 32B 33B 34B 35B 3·1 00 3·200 3·300 3·400 3·500 3·1 93 3·293 3·393 3·493 3·593 3·500 3·600 3·700 3·800 3·900 31 C 32C 33C 34C 35C 3·1 00 3·200 3·300 3·400 3·500 3·1 93 3·293 3·393 3·493 3·593 3·550 3·650 3·750 3·850 3·950 36A 37A 38A 3·600 3·700 3·800 3·680 3·780 3·880 4·000 4·1 00 4·200 36B 37B 38B 3·600 3·700 3·800 3·693 3·793 3·893 4·000 4·1 00 4·200 36C 37C 38C 3·600 3·700 3·800 3·693 3·793 3·893 4·050 4·1 50 4·250 * See Clause 5c) â ã BS 3A 1 7:1 962+A2:201 Table – Bearing length clamping length M and overall length E (continued) No 0-32 UNF *L Part No Code in ⁄2 D 0·050 1D 0·1 00 2D 0·200 3D 0·300 4D 0·400 5D 0·500 M −0·030 in 0·1 43 0·1 93 0·293 0·393 0·493 0·593 E +0·040 in 0·550 0·600 0·700 0·800 0·900 ·000 ⁄ in UNF *L Part No Code in ⁄2 E 0·050 1E 0·1 00 2E 0·200 3E 0·300 4E 0·400 5E 0·500 M −0·030 in 0·1 51 0·201 0·301 0·401 0·501 0·601 E +0·040 in 0·650 0·700 0·800 0·900 ·000 ·1 00 5/1 in UNF *L Part No Code in ⁄2 G 0·050 1G 0·1 00 2G 0·200 3G 0·300 4G 0·400 5G 0·500 M −0·030 in 0·1 63 0·21 0·31 0·41 0·51 0·61 E +0·040 in 0·700 0·750 0·850 0·950 ·050 ·1 50 6D 7D 8D 9D 0D 0·600 0·700 0·800 0·900 ·000 0·693 0·793 0·893 0·993 ·093 ·1 00 ·200 ·300 ·400 ·500 6E 7E 8E 9E 0E 0·600 0·700 0·800 0·900 ·000 0·701 0·801 0·901 ·001 ·1 01 ·200 ·300 ·400 ·500 ·600 6G 7G 8G 9G 0G 0·600 0·700 0·800 0·900 ·000 0·71 0·81 0·91 ·01 ·1 ·250 ·350 ·450 ·550 ·650 11D 2D 3D 4D 5D ·1 00 ·200 ·300 ·400 ·500 ·1 93 ·293 ·393 ·493 ·593 ·600 ·700 ·800 ·900 2·000 11E 2E 3E 4E 5E ·1 00 ·200 ·300 ·400 ·500 ·201 ·301 ·401 ·501 ·601 ·700 ·800 ·900 2·000 2·1 00 11G 2G 3G 4G 5G ·1 00 ·200 ·300 ·400 ·500 ·21 ·31 ·41 ·51 ·61 ·750 ·850 ·950 2·050 2·1 50 6D 7D 8D 9D 20D ·600 ·700 ·800 ·900 2·000 ·693 ·793 ·893 ·993 2·093 2·1 00 2·200 2·300 2·400 2·500 6E 7E 8E 9E 20E ·600 ·700 ·800 ·900 2·000 ·701 ·801 ·901 2·001 2·1 01 2·200 2·300 2·400 2·500 2·600 6G 7G 8G 9G 20G ·600 ·700 ·800 ·900 2·000 ·71 ·81 ·91 2·01 2·1 2·250 2·350 2·450 2·550 2·650 21 D 22D 23D 24D 25D 2·1 00 2·200 2·300 2·400 2·500 2·1 93 2·293 2·393 2·493 2·593 2·600 2·700 2·800 2·900 3·000 21 E 22E 23E 24E 25E 2·1 00 2·200 2·300 2·400 2·500 2·201 2·301 2·401 2·501 2·601 2·700 2·800 2·900 3·000 3·1 00 21 G 22G 23G 24G 25G 2·1 00 2·200 2·300 2·400 2·500 2·21 2·31 2·41 2·51 2·61 2·750 2·850 2·950 3·050 3·1 00 26D 27D 28D 29D 30D 2·600 2·700 2·800 2·900 3·000 2·693 2·793 2·893 2·993 3·093 3·1 00 3·200 3·300 3·400 3·500 26E 27E 28E 29E 30E 2·600 2·700 2·800 2·900 3·000 2·701 2·801 2·901 3·001 3·1 01 3·200 3·300 3·400 3·500 3·600 26G 27G 28G 29G 30G 2·600 2·700 2·800 2·900 3·000 2·71 2·81 2·91 3·01 3·1 3·250 3·350 3·450 3·550 3·650 31 D 32D 33D 34D 35D 3·1 00 3·200 3·300 3·400 3·500 3·1 93 3·293 3·393 3·493 3·593 3·600 3·700 3·800 3·900 4·000 31 E 32E 33E 34E 35E 3·1 00 3·200 3·300 3·400 3·500 3·201 3·301 3·401 3·501 3·601 3·700 3·800 3·900 4·000 4·1 00 31 G 32G 33G 34G 35G 3·1 00 3·200 3·300 3·400 3·500 3·21 3·31 3·41 3·51 3·61 3·750 3·850 3·950 4·050 4·1 50 36D 37D 38D 3·600 3·700 3·800 3·693 3·793 3·893 4·1 00 4·200 4·300 36E 37E 38E 3·600 3·700 3·800 3·701 3·801 3·901 4·200 4·300 4·400 36G 37G 38G 3·600 3·700 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