1、BSI Standards Publication BS SP 122 to 125:2016 AEROSPACE SERIES Washers for unified hexagons for aircraft (primarily for packing purposes)Publishing and copyright information The BSI copyright notice displayed in this document indicates when the document was last issued. The British Standards Insti
2、tution 2016 Published by BSI Standards Limited 2016 ISBN 978 0 580 91580 2 ICS 49.030.50 The following BSI references relate to the work on this document: Committee reference ACE/12 Draft for comment 15/30329891 DC Publication history First published June 1958 Second (current) edition January 2016 A
3、mendments issued since publication Date Text affected BS SP 122 to 125:2016 BRITISH STANDARDContents Foreword ii 1 Scope 1 2 Normative references 1 3 Materials 1 4 Dimensions 1 5 Protective finish 1 6 Freedom from defects 1 7 Identification 2 Bibliography 4 List of figures Figure 1 Dimensions 3 List
4、 of tables Table 1 British Standard numbers and materials 2 Table 2 Dimensions 3 Summary of pages This document comprises a front cover, an inside front cover, pages i to ii, pages 1 to 4, an inside back cover and a back cover. BRITISH STANDARD BS SP 122 to 125:2016 The British Standards Institution
5、 2016 iForeword Publishing information This British Standard is published by BSI Standards Limited, under licence from The British Standards Institution, and came into effect on 31 January 2016. It was prepared by Technical Committee ACE/12, Aerospace fasteners and fastening. A list of organizations
6、 represented on this committee can be obtained on request to its secretary. Supersession This British Standard supersedes BS SP 122 to 125:1958+A2:2011, which is withdrawn. Information about this document This is a full revision of the standard, and introduces the following principal change: a prote
7、ctive finish option has been added to aluminium washers SP124 and SP125. Use of this document It has been assumed in the preparation of this British Standard that the execution of its provisions will be entrusted to appropriately qualified and experienced people, for whose use it has been produced.
8、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”. Commentary, explanation and general informative material is presented in smaller italic type, and does
9、not constitute a normative 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. BRITI
10、SH STANDARD BS SP 122 to 125:2016 ii The British Standards Institution 20161 Scope This British Standard specifies the materials, dimensions and finish of mild steel, corrosion-resisting steel and aluminium alloy washers suitable for use with bolts with Unified hexagons for aircraft. The washers are
11、 intended primarily for use for packing purposes. Provision has been made for oversize bore washers for use when used in conjunction with oversize plain shank bolts, with the oversize washer being fitted onto the bolt head side of the clamped joint. 2 Normative references The following documents, in
12、 whole or in part, are normatively referenced in this document 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 EN 2133, Aerospace series Cadmi
13、um plating of steels with specified tensile strength 1 450 MPa, copper, copper alloys and nickel alloys SAE AMS 03-19, Electro-deposition of cadmium SAE AMS 03-25, Sulfuric acid anodizing of aluminium and aluminium alloys 3 Materials The washers shall be manufactured from the appropriate material sp
14、ecified in Table 1. 4 Dimensions The washers shall conform to the physical form shown in Figure 1 with dimension values as stated in Table 2. NOTE The figures in British units are to be regarded as the standard. 5 Protective finish SP122 washers shall be cadmium plated in accordance with SAE AMS 03-
15、19 or BS EN 2133. SP124 and SP125 washers have an option of sulfuric acid anodized finish in accordance with SAE AMS 03-25; to specify this option, code “A” shall be added to the part number, as shown in Clause 7. CAUTION. SP122 washers have cadmium as a plating material, which has been restricted a
16、nd/or banned for use in many countries owing to environmental and health concerns; they should not be used in new product designs. Local officials should be consulted about any concerns on using cadmium plated parts. 6 Freedom from defects a) The washers shall be free from surface defects, scale, pi
17、tting and burrs. They shall be flat, within a tolerance of .005 in., with parallel faces. b) Washers may be rejected at any time for faults in, or revealed by, manufacture, although they have been made from material passed previously for chemical composition and mechanical properties. BRITISH STANDA
18、RD BS SP 122 to 125:2016 The British Standards Institution 2016 17 Identification The washers shall be identified for any purpose by the relevant British Standard part numbers (see Table 1), together with the appropriate size code (see Table 2), the protective finish code (where appropriate see Clau
19、se 5) and by the oversize code (where appropriate see Table 2). The full part number shall be contiguous. Where an oversize is required, the identity shall be suffixed by the letter Y, for example: SP123J: a corrosion-resisting steel washer for use with a 3/8 in. Unified bolt, standard size; SP123JY
20、: a corrosion-resisting steel washer for use with a 3/8 in. Unified bolt, oversize. Where an anodized finish is required on aluminium alloy washers, the identity shall include a code “A”, for example: SP124J: an aluminium alloy washer with natural finish for use with a 3/8 in. Unified bolt; SP124JA:
21、 an aluminium alloy washer with anodized finish for use with a 3/8 in. Unified bolt. Where an oversize anodized aluminium washer is required, the suffixed identity code letters Y and A shall be ordered as, for example: SP124JAY: an aluminium washer with anodized finish for use with a 3/8 in. Unified
22、 bolt, oversize. Table 1 British Standard numbers and materials BS Part No. Material Description Specification A) Thin washers SP122 Carbon steel BS S 510 SP123 Softened 18/10 chromium-nickel corrosion-resisting steel sheet and strip (titanium stabilized 540 MPa); Softened 18/10 chromium-nickel corr
23、osion-resisting steel sheet and strip (niobium stabilized 540 MPa) BS S 526 BS S 527 SP124 Aluminium alloy BS L 163 BS L 166 BS EN 2088 Thick washers SP125 Aluminium alloy BS L 163 BS L 166 BS EN 2088 A) Latest issue. BRITISH STANDARD BS SP 122 to 125:2016 2 The British Standards Institution 2016Fig
24、ure 1 Dimensions Key A Diameter A or Oversize (Y) 1 Thin washers B Diameter B 2 Thick washers 1) The tolerance on thickness is to be as defined in the material specification. Table 2 Dimensions To suit bolts Size code Diameter A Diameter B Oversize (Y) max. min. max. min. max. min. Dimensions in inc
25、hes No. 440 UNC A .125 .120 .220 .215 .156 .151 No. 632 UNC B .151 .146 .295 .290 .182 .177 No. 832 UNC C .179 .174 .365 .360 .210 .205 No. 1032 UNF D .205 .200 .400 .395 .236 .231 1/4 in. UNF E .270 .265 .515 .505 .301 .296 5/16 in. UNF G .333 .328 .585 .575 .364 .359 3/8 in. UNF J .395 .390 .660 .
26、650 .426 .421 7/16 in. UNF L .458 .453 .805 .795 .489 .484 1/2 in. UNF N .520 .515 .875 .865 .551 .546 9/16 in. UNF P .583 .578 1.020 1.010 .614 .609 5/8 in. UNF Q .645 .640 1.095 1.085 .676 .671 3/4 in. UNF S .770 .765 1.235 1.225 .801 .796 7/8 in. UNF U .895 .890 1.455 1.455 .926 .921 1 in. UNF W
27、1.020 1.015 1.670 1.660 1.051 1.046 BRITISH STANDARD BS SP 122 to 125:2016 The British Standards Institution 2016 3Bibliography Standards publications For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments
28、) applies. BS L 163, Specification for sheet and strip of aluminium-coated aluminium-copper-magnesium-silicon-manganese alloy (Solution treated, cold worked for flattening and aged at room temperature) (Cu 4.4, Mg 0.5, Si 0.8, Mn 0.8) BS L 166, Specification for close toleranced sheet and strip of a
29、luminium-coated aluminium-copper-magnesium-silicon-manganese alloy (solution treated and aged at room temperature) (Cu 4.4, Mg 0.5, Si 0.8, Mn 0.8) BS S 510, Specification for carbon steel sheet and strip (430/540 MPa) (suitable for welding) BS S 526, Specification for softened 18/10 chromium-nickel
30、 corrosion-resisting steel sheet and strip (titanium stabilized: 540 MPa) BS S 527, Specification for softened 18/10 chromium-nickel corrosion-resisting steel sheet and strip (niobium stabilized: 540 MPa) BS EN 2088, Aerospace series Aluminium alloy AL-P2014A T4 or T42 Clad sheet and strip 0,4 mm a 6mm BRITISH STANDARD BS SP 122 to 125:2016 4 The British Standards Institution 2016
