1、BRITISH STANDARD BS SP121: 1958 Incorporating Amendment No.1 Collars for shear pins for aircraft UDC 621.886.5:629.13-2BSSP121:1958 This BritishStandard, having been approved by the Aircraft Industry Standards Committee and endorsed by the Chairman ofthe Engineering Divisional Council, was published
2、 under theauthority of the General Council of the Institution on 10January1958 BSI02-2000 The following BSI references relate to the work on this standard: Committee reference ACE/14 Draft for comment CV (ACE) 5064 ISBN 0 580 34566 1 A British Standard does not purport to include all the necessary p
3、rovisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pagesi andii, pages1 and 2,
4、an inside back cover 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. Amendments issued since publication Amd. No. Date of issue Comments 3549 November 1959 Indicat
5、ed by a sideline in the marginBSSP121:1958 BSI 02-2000 i Contents Page 1 Scope 1 2 Material 1 3 Dimensions 1 4 Finish 1 5 Protective treatment 1 6 Freedom from defects 1 7 Identification 1 Appendix Conversion of inches to millimetres Inside back cover Figure 1 2 Table 1 Dimensions and code letters f
6、or collars for close tolerance shearpinsfor aircraft 2ii blankBSSP121:1958 BSI 02-2000 1 1 Scope This BritishStandard specifies the material, dimensions and finish of aluminium alloy collars primarily for use with close tolerance shear pins, foraircraft purposes, complying with BS SP113 1) . 2 Mater
7、ial The collars shall be manufactured from bars or tubes complying with the requirements of the latest issue of BS L64 2)or BS L62 3)respectively. 3 Dimensions The collars shall conform to the dimensions and tolerances specified in Table 1. NOTEA table to assist in the conversion of the dimensions t
8、oapproximate metric equivalents is given in the Appendix. 4 Finish The collars shall have a smooth machined or equivalent finish. 5 Protective treatment The collars shall be anodized in accordance with the latest issue of Ministry of Supply aircraft process specification D.T.D.910. 6 Freedom from de
9、fects a) The collars shall be free from sharp edges and from burrs, and split pin holes shall be drilled clean and be free from burrs. b) Collars may be rejected at any time for faults in, or revealed by, manufacture, although they have been made from material passed previously for chemical composit
10、ion and mechanical properties. 7 Identification a) The collars shall be dyed blue by an approved process. b) The collars shall be identified for ordering by the number of this BritishStandard, together with the appropriate code letter shown in Table 1:for example, a collar for a 1 / 4 in. diameter p
11、in isBS SP121E. 1) BS SP113, Cadmium plated close tolerance shear pins for aircraft. 2) BS L64, Aluminium-copper-magnesium-silicon-manganese alloy bars, extruded sections and forgings solution treated and aged at room temperature. 3) BS L62, Aluminium-copper-magnesium-silicon-manganese alloy tubes s
12、olution treated and aged at room temperature.BSSP121:1958 2 BSI 02-2000 Table 1 Dimensions and code letters for collars for close tolerance shear pins for aircraft Third angle projection Figure 1 Code letter Nominal dia. To suit pin BS SP113 Dia. A Dia. B Length C Hole H max. min. 0.010 Drill size D
13、ia. in. in. in. in. in. in. A 1 / 8 A 0.1280 0.1250 0.250 0.220 No.52 0.0635 B 5 / 32 B 0.1593 0.1563 0.281 0.220 No.52 0.0635 C 0.1898 C and X 0.1928 0.1898 0.313 0.220 No.52 0.0635 E 1 / 4 E 0.2525 0.2500 0.375 0.220 No.52 0.0635 G 5 / 16 G 0.3160 0.3125 0.436 0.250 No.41 0.0960 J 3 / 8 J 0.3785 0
14、.3750 0.500 0.290 No.30 0.1285 L 7 / 16 L 0.4415 0.4375 0.563 0.290 No.30 0.1285 N 1 / 2 N 0.5040 0.5000 0.625 0.290 No.30 0.1285 +0 0.010 +0.010 0BSSP121:1958 BSI 02-2000 Appendix Conversion of inches to millimetres Metric equivalents of the dimensions in this BritishStandard may be obtained from t
15、he following table. in. 1 2 3 4 5 6 7 8 9 10 mm 25.4 50.8 76.2 101.6 127.0 152.4 177.8 203.2 228.6 254.0BS SP121: 1958 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstitution BSI is the independent national body responsible for preparing BritishStandards. It presents the UK view on s
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