1、BRITISH STANDARD AEROSPACE SERIES CONFIRMED APRIL 1998 BS 2SP 93: 1974 Incorporating Amendment No. 1 Specification for Elastomeric grommets (acrylonitrile- butadiene) for aerospace use UDC 629.7:62 761 477:678.745.32 136.22:678.762.2 134.532:678.074BS2SP 93:1974 This British Standard having beenappr
2、oved by the AerospaceIndustry Standards Committee, was published underthe authority of the Executive Board on 31 December 1974 BSI 01-2000 The following BSI references relate to the work on this standard: Committee reference ACE/14 Draft for approval 73/32568 ISBN 0 580 08489 2 Amendments issued sin
3、ce publication Amd. No. Date of issue Comments 3514 February 1981 Indicated by a sideline in the marginBS2SP 93:1974 BSI 01-2000 i Contents Page Foreword ii 1 Scope 1 2 References 1 3 Material 1 4 Dimensions 1 5 Finish 1 6 Identification and packaging 1 7 Inspection and life control in stores 1 8 Ex
4、ample of call up 3 Figure 1 Grommet 2 Table 1 Dimensions and part numbers 2 Table 2 Tolerances 3BS2SP 93:1974 ii BSI 01-2000 Foreword This British Standard has been prepared at the request of the Aerospace Industry to provide a range of grommets manufactured from acrylonitrile-butadiene rubber compl
5、ying with BS 2751, grade BA 60. The dimensional requirements of this standard are identical with those of BS 1767:1951 1) . For grommets manufactured from other elastomeric materials refer also to BSSP93 “Elastomeric grommets (polychloroprene”) and to AS 44404, AS 44405 and AS 44406 (Elastomeric gro
6、mmets various) (SBAC series). A British Standard does not purport to include all the necessary provisions 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
7、pages This document comprises a front cover, an inside front cover, pages i and ii, pages1 to 3 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. 1) The range of BS
8、1767 is slightly greater than that of this standard.BS2SP 93:1974 BSI 01-2000 1 1 Scope This British Standard specifies the requirements relating to material, dimensions, finish, packaging, identification and storage inspection of elastomeric grommets resistant to mineral lubricating oils and to spl
9、ash attack by fuels, synthetic lubricating oils and mineral hydraulic fluids in aircraft for operating temperatures up to 90 C with peaks above this maximum. 2 References This standard makes reference to the following British Standards: BS 1916, Limits and fits for engineering Part1:Limits and toler
10、ances. BS 2751, Acrylonitrile/butadiene rubbers. BS F 68, The storage and inspection in store of vulcanized rubber items. BS F 69, Packaging and identification of vulcanized rubber items. 3 Material The material shall comply with the requirements specified in BS 2751, grade BA 60 (Hardness 60 + 5, 4
11、 IRHD). NOTEAlternatively, only when specifically requested by the customer, the grommets may be manufactured from material complying with M.O.D. specification DTD 5509, gradeD (obsolescent) until that specification has been withdrawn. 4 Dimensions 4.1 The grommets shall conform to the dimensions sh
12、own in Table 1, within the tolerances shown in Table 2. 4.2 The diameters of the panel holes into which the grommets are fitted should be equal to dimension W shown in Table 1, with H12 tolerances in accordance with BS 1916 NOTEThe dimensions in Table 1 are identical with those of BS1767 2) , BS SP
13、95, SBAC series AS 44404, AS 44405 and AS44406. 5 Finish 5.1 All flash and spew shall be removed by the manufacturer. 5.2 The surfaces shall be free from imperfections such as blisters and excessive porosity and bloom. 6 Identification and packaging The grommets shall be identified and packaged to t
14、he requirements specified in BS F 69. 7 Inspection and life control in stores When required, and unless otherwise controlled, the inspection and stores lifting shall be accordance with BS F 68. 2) The range of BS 1767 is slightly greater than that of this standard.BS2SP 93:1974 2 BSI 01-2000 Table 1
15、 Dimensions and part numbers Figure 1 Grommet Dimensions in inches V W X Y Z 0.04 0.07 0.10 0.15 0.20 0.25 PART NUMBERS 1 / 16 1 / 8 3 / 16 3 / 16 1 / 4 5 / 16 0.313 0.375 0.438 0.094 0.094 0.094 A02 A04 A06 B02 B04 B06 C04 C06 D04 D06 E04 E06 F04 F06 1 / 4 5 / 16 3 / 8 3 / 8 7 / 16 1 / 2 0.500 0.62
16、5 0.688 0.094 0.125 0.125 A08 A10 A12 B08 B10 B12 C08 C10 C12 D08 D10 D12 E08 E10 E12 F08 F10 F12 7 / 16 1 / 2 9 / 16 5 / 8 11 / 16 3 / 4 0.813 0.875 1.000 0.125 0.125 0.125 A14 A16 A18 B14 B16 B18 C14 C16 C18 D14 D16 D18 E14 E16 E18 F14 F16 F18 5 / 8 11 / 16 3 / 4 13 / 16 15 / 16 1 1.063 1.188 1.25
17、0 0.125 0.125 0.125 A20 A22 A24 B20 B22 B24 C20 C22 C24 D20 D22 D24 E20 E22 E24 F20 F22 F24 7 / 8 1 1 1 / 8 1 1 / 8 1 1 / 4 1 3 / 8 1.438 1.563 1.688 0.156 0.156 0.156 A28 A32 A36 B28 B32 B36 C28 C32 C36 D28 D32 D36 E28 E32 E36 F28 F32 F36 1 1 / 4 1 3 / 8 1 1 / 2 1 1 / 2 1 5 / 8 1 3 / 4 1.813 1.938
18、2.125 0.156 0.156 0.188 A40 A44 A48 B40 B44 B48 C40 C44 C48 D40 D44 D48 E40 E44 E48 F40 F44 F48 1 3 / 4 2 2 2 1 / 4 2.375 2.625 0.188 0.188 A56 A64 B56 B64 C56 C64 D56 D64 E56 E64 F56 F64BS2SP 93:1974 BSI 01-2000 3 Table 2 Tolerances 8 Example of call-up A grommet with bore diameter of 1 / 2inch and
19、 a groove of 0.1 inch would be called up as: Dimensions in inches Dimension Range of sizes Tolerance V 1 / 16to 3 / 4inclusive 7 / 8to 2 +0.0000.020 +0.0000.040 W 3 / 16to 1 inclusive 1 1 / 8to 2 1 / 4 +0.0200.000 +0.0400.000 X all sizes +0.0300.000 Y all sizes +0.0100.000 Z all sizes +0.0200.000 Co
20、ncentricity of diameters W andV Diameter V: 1 / 16to 1 / 2 9 / 16to 2 W in relation to V to beconcentricwithin 0.010 F.I.M. 0.020 F.I.M.BS 2SP 93: 1974 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstitution BSI is the independent national body responsible for preparing BritishStanda
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