1、BRITISH STANDARD AEROSPACE SERIESBS 2SP 77 to2SP 80:1973(Superseding BS SP 77-80) Incorporating Amendment Nos. 1, 2 and 3 Specification forSnap head aluminium and aluminium alloy rivets*UDC 629.7.02:621.884.2:669.71*Index form of title: Rivets, snap head, in L36, L37, L58 and L86 materials.Licensed
2、Copy: Miss Judi Crimmins, British Standards Institution, 04/12/2012 15:24, Uncontrolled Copy, (c) The British Standards Institution 2012+A4:2015ICS 49.030.60BS 2SP 77 to 2SP 80:1973+A4:2015ISBN 978 0 580 81038 1Amendments issued since publicationAmd. No. Date Comments1884 January 19762389 November 1
3、9773264 June 1980A4 January 2015 See ForewordThis British Standard, having been approved by the Aerospace Industry Standards Committee, was published under the authority of the Executive Board on 31 October 1973 The British Standards Institution 2015 Published by BSI Standards Limited 2015The follow
4、ing BSI references relate to the work on this standard: Committee reference ACE/14 Drafts for approval 72/35865 DC 13/30273392ForewordPublishing informationBS 2SP 77 to BS 2SP 80:1973+A4:2015 is published by BSI Standards Limited, under licence from The British Standards Institution, and came into e
5、ffect on 31 January 2015. It was prepared by Technical Committee ACE/12, Aerospace Fasteners and Fastening. A list of organizations represented on this committee can be obtained on request to its secretary.SupersessionBS 2SP 77 to BS 2SP 80:1973+A4:2015 supersedes BS 2SP 77 to BS 2SP 80:1973 (incorp
6、orating Amendments No.1, No. 2 and No. 3) which is withdrawn.Information about this documentThese standards form part of a series of British Standards for rivets prepared at the request of the aerospace industry. The 1958 edition provided for ranges of snap head aluminium and aluminium alloy rivets
7、with head proportions and shank diameters basically the same as those used hitherto. In general, the dimensions of the rivets were more closely defined than previously, although the shank tolerances on sizes above in are wider than those adopted in BS SP 68 to BS SP 71, “100 countersunk precision he
8、ad aluminium and aluminium alloy rivets”.The distribution of the shank tolerances follows the American practice of allocating the greater part of the tolerance to the positive side, as compared with the practice in A.S. Standards for rivets of distributing the tolerances about the nominal diameter.
9、This principle, as well as the proportions of the rivet heads, has been endorsed by Technical Committee ISO/TC 20 Aircraft and space vehicles, of the International Organization for Standardization, as have the identification markings contained in this revision of the standards. A method for the iden
10、tification of undyed versions of the rivets is also given. Details of rivets with radiused tails for use in auto-riveting machines are given in Appendix A.Text introduced or altered by Amendment No. 4 is indicated in the text by tags . Minor editorial changes are not tagged. Previous amendments are
11、not indicated.Presentational conventionsThe 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”.Commentary, explanation and general informative material is presented in smaller italic typ
12、e, and does not constitute a normative element.Contractual and legal considerationsThis 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 obligatio
13、ns.Summary of pagesThis document comprises a front cover, an inside front cover, pages i and ii, pages 1 to 5 and a back cover.This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover.BS 2SP
14、77 to 2SP 80:1973 BSI 02-2000 iContentsPageForeword Inside front cover1 Scope 12 Materials 13 Condition of rivets 14 Dimensions 15 Finish 16 Identification and marking 17 Freedom from defects 28 Heat treatment of rivets 29 Packaging 2Appendix A Rivets for use in auto-riveting machines 5Appendix B Co
15、nversion of inches to approximate millimetreequivalents 5Figure 1 Dimensions of identification marks 3Figure 2 Rivet dimensions 3Figure 2a Enlarged view of head 3Figure 3 Snap head rivet 4Figure 4 Detail of radiused tail 5Table 1 British Standard numbers, materials, finish and marking of snap head a
16、luminium and aluminium alloy rivets 2Table 2 Dimensions of snap head aluminium and aluminium alloy rivets 3Table 3 Standard lengths and part numbers of snap headaluminium and aluminium alloy rivets 4Table 4 Dimensions of radiused tails 5Licensed Copy: Miss Judi Crimmins, British Standards Institutio
17、n, 04/12/2012 15:24, Uncontrolled Copy, (c) The British Standards Institution 2012BS 2SP 77 to 2SP 80:1973 BSI 02-2000 iContentsPageForeword Inside front cover1 Scope 12 Materials 13 Condition of rivets 14 Dimensions 15 Finish 16 Identification and marking 17 Freedom from defects 28 Heat treatment o
18、f rivets 29 Packaging 2Appendix A Rivets for use in auto-riveting machinesAppendix B Conversion of inches to approximate millimetreequivalents 5Figure 1 Dimensions of identification marks 3Figure 2 Rivet dimensions 3Figure 2a Enlarged view of head 3Figure 3 Snap head rivet 4Figure 4 Detail of radius
19、ed tail 5Table 1 British Standard numbers, materials, finish and marking of snap head aluminium and aluminium alloy rivets 2Table 2 Dimensions of snap head aluminium and aluminium alloy rivets 3Table 3 Standard lengths and part numbers of snap headaluminium and aluminium alloy rivets 4Table 4 Dimens
20、ions of radiused tails 5Licensed Copy: Miss Judi Crimmins, British Standards Institution, 04/12/2012 15:24, Uncontrolled Copy, (c) The British Standards Institution 2012BS 2SP 77 to 2SP 80:1973+A4:2015i The British Standards Institution 2015Protective finishiiblankLicensed Copy: Miss Judi Crimmins,
21、British Standards Institution, 04/12/2012 15:24, Uncontrolled Copy, (c) The British Standards Institution 2012BS 2SP 77 to 2SP 80:1973 BSI 02-2000 11 ScopeThese British Standards specify the material, dimensions, finish, marking and part numbers of snap head aluminium and aluminium alloy rivets for
22、aerospace use.NOTE The figures in inch units are to be regarded as the standard. A table is given in Appendix B to provide a ready means of calculating the approximate metric equivalents of the imperial dimensions. More accurate conversions should be based on the tables in BS 350.2 MaterialsThe rive
23、ts shall be manufactured from the appropriate material specified in Table 1 in the condition as supplied.3 Condition of rivets3.1 Rivets to BS SP 77 require no heat treatment.3.2 Rivets to BS SP 78 require heat treatment in accordance with 8.1 and 8.2 before use.3.3 Rivets to BS SP 79 require no hea
24、t treatment.3.4 Rivets to BS SP 80 shall be finally heat treated by the rivet manufacturer in accordance with 8.3.4 DimensionsThe rivets shall conform to the dimensions specified in Table 2 and Table 3.5 FinishThe finish of the rivets shall be in accordance with the relevant requirements of Table 1.
25、Anodic treatment shall be in accordance with the requirements of the latest issue of Procurement Executive M.O.D. aircraft process specification DEF 151.Chemical oxidation shall be in accordance with the requirements of the latest issue of Procurement Executive M.O.D. aircraft process specification
26、DTD 913.Colouring shall be in accordance with the requirements of the latest issue of Procurement Executive, M.O.D. aircraft process specification DTD 913, or other approved process, e.g., DEF 151.6 Identification and marking6.1 The marking of the rivets shall be as specified in Table 1, and shall b
27、e applied as follows.1) Rivets over 3/32in diameter which do not exceed 8 diameters in length shall be marked on the shank end with the exception of the 1/8in diameter which may be marked on the head.2) Rivets 1/16in and 3/32in diameter in all lengths, and rivets over 3/32in diameter which exceed 8
28、diameters in length, may be marked on either the head or the shank end.The marking, whether indented or embossed, shall be clearly visible and the height or depth shall not exceed the following dimensions:0.006 in on sizes up to and including 1/8in diameter;0.008 in on sizes 5/32in and 3/16in diamet
29、er;0.010 in on sizes 7/32in diameter and over.6.2 Rivets identified by old-style markings may be supplied until existing stocks are consumed. The obsolescent markings are as follows:6.3 The rivets shall be identified for ordering purposes by the relevant British Standard number (see Table 1) and the
30、 appropriate part number (see Table 3), e.g. a rivet in L 58 material 1/8in diameter 5/6in length is BS SP 79-410.Material MarkingL 36 “1”L 37 7L 58 8L 86 0Licensed Copy: Miss Judi Crimmins, British Standards Institution, 04/12/2012 15:24, Uncontrolled Copy, (c) The British Standards Institution 201
31、2BS 2SP 77 to 2SP 80:1973 BSI 02-2000 11 ScopeThese British Standards specify the material, dimensions, finish, marking and part numbers of snap head aluminium and aluminium alloy rivets for aerospace use.NOTE The figures in inch units are to be regarded as the standard. A table is given in Appendix
32、 B to provide a ready means of calculating the approximate metric equivalents of the imperial dimensions. More accurate conversions should be based on the tables in BS 350.2 MaterialsThe rivets shall be manufactured from the appropriate material specified in Table 1 in the condition as supplied.3 Co
33、ndition of rivets3.1 Rivets to BS SP 77 require no heat treatment.3.2 Rivets to BS SP 78 require heat treatment in accordance with 8.1 and 8.2 before use.3.3 Rivets to BS SP 79 require no heat treatment.3.4 Rivets to BS SP 80 shall be finally heat treated by the rivet manufacturer in accordance with
34、 8.3.4 DimensionsThe rivets shall conform to the dimensions specified in Table 2 and Table 3.5 FinishThe finish of the rivets shall be in accordance with the relevant requirements of Table 1.Anodic treatment shall be in accordance with the requirements of the latest issue of Procurement Executive M.
35、O.D. aircraft process specification DEF 151.Chemical oxidation shall be in accordance with the requirements of the latest issue of Procurement Executive M.O.D. aircraft process specification DTD 913.Colouring shall be in accordance with the requirements of the latest issue of Procurement Executive,
36、M.O.D. aircraft process specification DTD 913, or other approved process, e.g., DEF 151.6 Identification and marking6.1 The marking of the rivets shall be as specified in Table 1, and shall be applied as follows.1) Rivets over 3/32in diameter which do not exceed 8 diameters in length shall be marked
37、 on the shank end with the exception of the 1/8in diameter which may be marked on the head.2) Rivets 1/16in and 3/32in diameter in all lengths, and rivets over 3/32in diameter which exceed 8 diameters in length, may be marked on either the head or the shank end.The marking, whether indented or embos
38、sed, shall be clearly visible and the height or depth shall not exceed the following dimensions:0.006 in on sizes up to and including 1/8in diameter;0.008 in on sizes 5/32in and 3/16in diameter;0.010 in on sizes 7/32in diameter and over.6.2 Rivets identified by old-style markings may be supplied unt
39、il existing stocks are consumed. The obsolescent markings are as follows:6.3 The rivets shall be identified for ordering purposes by the relevant British Standard number (see Table 1) and the appropriate part number (see Table 3), e.g. a rivet in L 58 material 1/8in diameter 5/6in length is BS SP 79
40、-410.Material MarkingL 36 “1”L 37 7L 58 8L 86 0Licensed Copy: Miss Judi Crimmins, British Standards Institution, 04/12/2012 15:24, Uncontrolled Copy, (c) The British Standards Institution 2012Licensed Copy: Miss Judi Crimmins, British Standards Institution, 04/12/2012 15:24, Uncontrolled Copy, (c) T
41、he British Standards Institution 2012Licensed Copy: Miss Judi Crimmins, British Standards Institution, 04/12/2012 15:24, Uncontrolled Copy, (c) The British Standards Institution 2012BS 2SP 77 to 2SP 80:1973+A4:20151 The British Standards Institution 2015NOTE The figures in inch units are to be regar
42、ded as the standard. Accurate metric conversions should be based on the tables in BS 350.5 Protective finishAnodic treatment shall be in accordance with the requirements of the latest issue of MoD Defence Equipment and Support Standard Def Stan 03-25.Chemical oxidation shall be in accordance with th
43、e requirements of the latest issue of MoD Defence Equipment and Support Standard DTD 913.Colouring shall be in accordance with the requirements of the latest issue of MoD Defence Equipment and Support Standard DTD 913, or other approved process, e.g., Def Stan 03-25.SP79-410.BS 2SP 77 to 2SP 80:1973
44、2 BSI 02-20006.4 Undyed versions of rivets shall be identified by their part number with the letter “U” in place of the dash.6.5 Example of call-up:7 Freedom from defectsThe rivets shall be free from harmful defects.Rivets may be rejected at any time for faults in, or revealed by, manufacture, altho
45、ugh they have been made from material passed previously for chemical composition and mechanical properties.8 Heat treatment of rivets8.1 Immediately before use or before refrigeration as described in 8.2 rivets to BS SP 78 shall be heated uniformly at a temperature of 495 5 C and quenched in water a
46、t a temperature not exceeding 40 C.8.2 Rivets to BS SP 78 commence to age harden immediately when kept at atmospheric temperature after quenching. Ageing may be delayed, however, by storing the rivets at low temperatures after quenching, and they may be expected to remain in a condition suitable for
47、 closing for a period depending on the storage temperature as shown below:The rivets shall be closed within two hours of solution treatment if kept at atmospheric temperature or within two hours of removal from cold storage.8.3 Rivets to BS SP 80 shall be heat treated by the rivet manufacturer as fo
48、llows.Solution treat at a temperature of 495 5 C and quench in water at a temperature not exceeding 40 C. Age at room temperature for not less than four days.9 PackagingRivets shall be packaged, bagged or labelled, and such packaging, bags and labels shall bear the appropriate complete part number,
49、e.g. BS SP 79-410. See Table 3 for part numbers.Table 1 British Standard numbers, materials, finish and marking of snap head aluminium and aluminium alloy rivetsNOTE Undyed versions of rivets in L 36, L 58 and L 86 are also available. See 6.4.Temperature Maximum storage period0 C to 5 C 45 hours 15 C to 20 C 150 hoursBritish Standard no.Material FinishIdentification mark (see 6.1)DescriptionBritish StandardTreatment ColourBS SP 77 AluminiumaL 36 Anodic or chemical oxidationBlack “I”BS SP 78Aluminium alloyaL 3
