1、BRITISH STANDARD AEROSPACE SERIES BS SP 166:1982 Specification for Spring retaining rings for aerospace application: carbon steel circlips (metricseries) UDC 629.7.028:621.882.54BSSP166:1982 This BritishStandard, having been prepared under the directionof the Aerospace Standards Committee, waspublis
2、hed under the authorityofthe Board of BSI and comes into effect on 31 May1982 BSI02-2000 The following BSI references relate to the work on this standard: Committee reference ACE/14 Draft for comment80/79939 ISBN 0 580 12692 7 Foreword This BritishStandard specifies a range of internal and external
3、retaining rings (circlips) and related grooves for aerospace applications and is based on BS3673-4. It replaces the metric series specified in BS SP96. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their corr
4、ect 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 to15 and a back cover. This standard has been updated (see copyright date) and may have h
5、ad amendments incorporated. This will be indicated in the amendment table on the inside front cover. Amendments issued since publication Amd. No. Date of issue CommentsBSSP166:1982 BSI 02-2000 i Contents Page Foreword Inside front cover 1 Scope 1 2 References 1 3 Definitions and nomenclature 1 4 Mat
6、erial 2 5 Form, dimensions and tolerances 2 6 Heat treatment and hardness 2 7 Finish 3 8 Protective treatment 3 9 Tests 3 10 Dimensions of circlips and grooves 4 11 Production batch acceptance 4 12 Marking 5 Figure 1 Circlip nomenclature 1 Figure 2 Radial flatness error d-T 2 Figure 3 Spiral flatnes
7、s error (helical pitch) 2 Figure 4 Bend test 3 Table 1 Hardness ranges 3 Table 2 Circlips: external series 6 Table 3 Circlips: internal series 11ii blankBSSP166:1982 BSI 02-2000 1 1 Scope This BritishStandard specifies the requirements for internal and external metric series circlips manufactured fr
8、om carbon steel, for aerospace applications. Requirements for material, heat treatment, hardness and manufacture are stated, together with dimensions and tolerances. The requirements for the finish and testing of the circlips are also given. 2 References This standard makes reference to the followin
9、g standards publications. BritishStandards BS427, Method of Vickers hardness test Part1:Testing of metals Part2: Verification of the testing machine. BS891, Method for Rockwell hardness test Part1:Testing of metals Part2: Verification of testing machine. BS1449, Steel plate, sheet and strip Part1:Ca
10、rbon steel plate, sheet and strip. BS3673, Spring retaining rings Part4: Carbon steel circlips metric series. BS4500, ISO limits and fits. BS6001, Sampling procedures and tables for inspection by attributes. BS S513, Spring steel strip. BS SP96, Specification for internal retaining rings. Ministry o
11、f Defence standards BS6001, Sampling procedures and tables for inspection by attributes. BS S513, Spring steel strip. BS SP96, Specification for internal retaining rings. 3 Definitions and nomenclature For the purposes of this BritishStandard the nomenclature used in Figure 1 applies together with t
12、he following definitions. 3.1 nominal size of a circlip the nominal diameter of shaft or bore for which the circlip is designed 3.2 radial flatness error (dish) the minimum distance separating two parallel planes which just contain the sectional profile of a circlip, the free ends of which are posit
13、ioned in a common plane in order to discount any spiral effect which may be present (seeFigure 2) Figure 1 Circlip nomenclatureBSSP166:1982 2 BSI 02-2000 3.3 spiral flatness error (helix) the minimum distance separating two parallel planes, perpendicular to the axis of the circlip, which just contai
14、n the circlip, the free ends being mutually displaced by the helix in the circlip (seeFigure 3) 3.4 edge margin the distance from the end of the shaft or bore to thenearest groove wall 3.5 beam the maximum radial depth of the circlip section with the exception of the lugs 4 Material Circlips manufac
15、tured from cold rolled strips shall be manufactured from strip complying with the requirements of grade70 or grade80 range of BS1449-1 or BS S513. Circlips not manufactured from strip should utilize similar material which will ensure that the circlips are capable of complying with the test requireme
16、nts of clause9. 5 Form, dimensions and tolerances 5.1 General. The form, dimensions and tolerances of internal and external circlips shall be as given in Table 2 and Table 3 and in accordance with5.2 to5.7 (see also clause10). 5.2 Holes (or slots). Each end of each circlip shall have a hole (or, in
17、the case of external circlips, a hole or a slot) in order to facilitate assembly by use of circlip pliers. The holes (or slots) shall be so positioned that, when the circlip is fitted in a groove of appropriate dimensions, the hole (or slot) shall be clear of the external diameter of the shaft or, i
18、n the case of internal circlips, clear of the internal diameter of the bore. The diameter of the holes (or width of slots) shall be as given in Table 2 and Table 3 and sufficient material shall be retained around each hole (or on either side of each slot) to ensure that no permanent distortion of th
19、e circlip ends shall result when circlip pliers are applied during assembly of the circlip under normal conditions. 5.3 Lugs. Circlips up to and including150mm designating size shall have integrally formed lugs. The profile of the lug may vary at the discretion of the manufacturer provided that the
20、following conditions are met. a) External circlips. When passed over a shaft of the maximum diameter as given in Table 2, the circlip shall be capable of passing through the clearance diameter C 1 . b) Internal circlips. When passed through a bore of the minimum diameter as given in Table 3, thecirc
21、lip shall be capable of passing over the clearance diameter C 1 . 5.4 Lug fillet. A fillet of minimum radius equal to the maximum thickness T of the circlip shall be formed adjacent to each lug. The fillet shall blend smoothly with the lug profile and with the wing depth. At no point around the cont
22、our shall the fillet undercut either the lug profile or the wing (seeFigure 1). 5.5 Tolerance on radial flatness. Departures from radial flatness (see3.2) shall be not greater than the values stated in10.4.2. 5.6 Tolerance for helix. Departures from spiral flatness (see3.3) shall be not greater than
23、 the values stated in10.4.3. 5.7 Tolerance on thickness. Thickness tolerances shall be inclusive of the thickness of the finish applied. 6 Heat treatment and hardness Circlips shall be austempered or hardened and tempered in accordance with the hardness ranges given in Table 1. Figure 2 Radial flatn
24、ess error d-T Figure 3 Spiral flatness error (helical pitch)BSSP166:1982 BSI 02-2000 3 Table 1 Hardness ranges Hydrogen de-embrittlement treatment shall be carried out after phosphating in accordance with clause8. 7 Finish The circlips shall be completely free of burrs and scale, and no cracks, pitt
25、ing or other surface defects shall be present. In addition, particular attention shall be paid to the “fitting corners” of the circlips such that no evidence of sharp edges or defects which could produce “stress-raisers” is present. NOTEIt is recommended that in order to achieve these requirements,
26、barrelling with aluminium oxide chippings or similar agent or process be used. Examination shall be made prior to phosphating at a minimum magnification of 10. 8 Protective treatment 8.1 The circlips shall be phosphated in accordance with DEF STAN0311, class1, and de-embrittled at180 C to200 C for n
27、ot less than18h beginning within30min of completing the phosphating treatment. 8.2 Temporary anti-corrosion oil PX-4 in accordance with DEF STAN8034 shall be applied immediately following de-embrittlement. 9 Tests 9.1 General. Each circlip shall comply with the requirements of the tests described in
28、9.2 to9.5. 9.2 Permanent set and grip. The circlips shall grip firmly on the groove diameters, minima for external circlips and maxima for internal circlips, given in Table 2 and Table 3 after having been passed three times over a shaft (for the external type) or through a bore (for the internal typ
29、e) which are1% greater than the shaft nominal diameter or1% less than the bore nominal diameter, respectively. The circlips shall be relaxed between each phase of the test. NOTEBy “grip firmly” it is meant that with the shaft or bore positioned vertically the circlip will remain correctly in positio
30、n on the groove diameter, unaided and under its own weight. Provision should be made to ensure that at all times during the test the circlip is normal to the axis of the test shaft or test bore as applicable. 9.3 Bend and fracture test. The circlip shall be positioned so that it is gripped across th
31、e beam section, as shown in Figure 4. The circlip shall then be bent through30 by repeated light hammer blows around a test block of radius equal to the maximum thickness of the circlip, following which, there shall be no visible signs of fracture, cracks or similar defects. The circlip shall then b
32、e further bent until fracture occurs, following which examination of the fracture shall reveal a uniform grain structure with no sign of laminations or other defects. 9.4 Hardness. Tests shall be carried out in accordance with BS891-1 using a machine verified in accordance with BS891-2 for the Rockw
33、ell hardness values or in accordance with BS427-1 using a machine verified in accordance with BS427-2 for the Vickers hardness values. The hardness of each circlip shall be within the appropriate range as given in Table 1. 9.5 Stress embrittlement (see clause8). After de-embrittlement treatment, ext
34、ernal circlips shall be stressed by placing them for a period of24h on a shaft of appropriate nominal diameter. Internal circlips shall be stressed by placing them for a period of24h in a bore of appropriate nominal diameter. After release, the circlips, under a magnification of at least 10, shall s
35、how no evidence of cracks or other surface defects. Size range Hardness values Austempered Hardened and tempered HRC HV HRC HV mm Up to38 39 to150 49 to54 46 to51 523 to600 470 to560 47 to52 44 to49 480 to572 440 to523 NOTEThe Rockwell method of hardness testing is not suitable for circlips of less
36、than1.75mm thickness (BS891refers). Figure 4 Bend testBSSP166:1982 4 BSI 02-2000 10 Dimensions of circlips and grooves 10.1 Tolerances on thickness T. Tolerances shall be based on h11 1) . 10.2 Tolerances on M. A range of5% of the value given shall be applied up to and including150mm nominal size. N
37、OTEThe values given in Table 2 and Table 3 are approximate. 10.3 Lug fillet. Minimum radius= T max. 10.4 Groove diameters 10.4.1 General. Groove diameters shall be as given in Table 2 and Table 3 subject to the tolerances specified in10.4.2 and10.4.3. The bottoms of grooves shall have radii of10% ma
38、ximum of groove depth. 10.4.2 Tolerances on radial flatness. Maximum error shall be as follows (see3.2). 10.4.3 Tolerances for spiral flatness. Maximum error shall be as follows (see3.3). The pitch of the helix shall not exceed T, where T is the maximum thickness of the circlip. 10.5 Groove widths.
39、Groove widths shall be as given in Table 2 and Table 3, subject to tolerances toH13 1) . 10.6 Edge margins. Minimum edge margins shall be as given in Table 2 and Table 3. 10.7 Maximum shaft diameter. Maximum shaft diameter shall be S, subject to tolerance h11 1) , where S is the nominal size of shaf
40、t. 10.8 Minimum bore diameter. Minimum bore diameter shall be B, subject to tolerance H11 1) , where B is the nominal size of bore. 11 Production batch acceptance 11.1 Batch. A batch shall consist of finished circlips which are of the same type and size, formed by the same process from material of t
41、he same cast, heat-treated and protectively treated as one lot and produced without changes or interruption which could cause significant variations in the quality of the finished product. 11.2 Sampling. Random samples shall be taken from each batch in accordance with11.3 for dimensional and non-des
42、tructive inspection, and with11.4 for destructive inspection. 11.3 Samples for dimensional and non-destructive inspection. Samples shall be taken from each batch in accordance with BS6001 at general inspection level II. The acceptance or rejection shall depend upon the acceptable quality levels (AQL
43、s) applied to the characteristics as follows. 11.4 Samples for destructive inspection. For each of the following tests a sample of five circlips shall be taken from the finished batch. a) Hardness(9.3) b) Permanent set and grip(9.1) c) Bend and fracture test(9.2) d) De-embrittlement test(9.4) Any si
44、ngle failure shall cause rejection of the entire batch. 1) See BS4500. Up to and including22mm nominal size of circlip 0.10mm 23mm up to and including39mm nominal size of circlip 0.15mm 40mm up to and including82mm nominal size of circlip 0.20mm 85mm up to and including150mm nominal size of circlip
45、0.25mm AQL Characteristics 0.4 Cracks and other surface defects Burrs Sharp edges on fitting corners 1.0 Thickness and fitting diameters Radial and spiral flatness 2.5 Other dimensions Phosphating (visual examination)BSSP166:1982 BSI 02-2000 5 12 Marking Each package of circlips shall be clearly and
46、 indelibly marked with the following details. a) The number of this BritishStandard, i.e.BSSP166 2) . b) The appropriate size-designating reference number or manufacturers designation as given in column1 of Table 2 and Table 3 3) . c) The manufacturers name or trademark. 2) Marking BS SP166 on or in
47、 relation to a product is a claim by the manufacturer that the product has been manufactured in accordance with the requirements of the standard. The accuracy of such a claim is therefore solely the manufacturers responsibility. Enquiries as to the availability of third party certification to suppor
48、t such claims should be addressed to the Director, Quality Assurance Division, BritishStandards Institution, Maylands Avenue, Hemel Hempstead, Herts HP24SQ in the case of certification marks administered by BSI or to the appropriate authority for other certification marks. 3) The basis of these refe
49、rence numbers is as follows. The reference number of the circlip has to be as given in column1 of Table 2 and Table 3 adding, if necessary, a cypher or cyphers in order to retain, in all cases, the same number of digits; also adding the appropriate prefix “S”, (shaft) or “B”, (bore) and the suffix “M” (metric) as shown in the following examples. S012 M. External circlip to suit12mm nominal diameter shaft. B150 M. Internal circlip to suit150mm nominal diameter bore.BS SP 166:1982 6 BSI 02-2000 Table 2 Circlips: external series
