BS-957-2008.pdf
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1、BS 957:2008 Specification for feeler gauges ICS 17.040.30 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW BRITISH STANDARD Licensed CopyChinese University of Hong Kong, 21/10/2008 08:06, Uncontrolled Copy, (c) BSI Publishing and copyright information The BSI copyright notice d
2、isplayed in this document indicates when the document was last issued. BSI 2008 ISBN 978 0 580 62080 5 The following BSI references relate to the work on this standard: Committee reference TDW/4 Draft for comment 08/30178090 DC Publication history BS 957 (inch units) first published July 1941 (renum
3、bered as BS 957-1 in July 1969) BS 957-2 (metric units) first published July 1969 BS 957 (inch and metric) (present edition) published 30 September 2008 Amendments issued since publication Amd. no.DateText affected BS 957:2008 Licensed CopyChinese University of Hong Kong, 21/10/2008 08:06, Uncontrol
4、led Copy, (c) BSI BSI 2008i BS 957:2008 Contents Foreword ii 1 Scope 1 2 Normative references 1 3 General 1 4 Material of blades 1 5 Dimensions of blades 2 6 Finish 2 7 Accuracy 3 8 Sheath 3 9 Marking 3 10 Protection against climatic conditions 4 Annexes Annex A (informative) Recommended combination
5、s of blades 5 List of tables Table 1 Hardness test metric units 1 Table 2 Hardness test inch units 1 Table 3 Tolerances on thickness of blades metric units 3 Table 4 Tolerances on thickness of blades inch units 3 Table A.1 Combination of blades metric units 5 Table A.2 Combination of blades inch uni
6、ts 6 Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages 1 to 6, an inside back cover and a back cover. Licensed CopyChinese University of Hong Kong, 21/10/2008 08:06, Uncontrolled Copy, (c) BSI BS 957:2008 ii BSI 2008 Foreword Publishing information
7、This British Standard is published by BSI and came into effect on 30 September 2008. It was prepared by Technical Committee TDW/4, Technology product realization. A list of organizations represented on this committee can be obtained on request to its secretary. Supersession This British Standard sup
8、ersedes BS 957-1:1941 and BS 957-2:1969, which are withdrawn. Information about this document This British Standard has been fully revised to bring it up to date. Presentational conventions The provisions of this standard are presented in roman (i.e. upright) type. Its requirements are expressed in
9、sentences in which the principal auxiliary verb is “shall”. Commentary, explanation and general informative material is presented in smaller italic type, and does not constitute a normative element. Contractual and legal considerations This publication does not purport to include all the necessary p
10、rovisions of a contract. Users are responsible for its correct application. Compliance with a British Standard cannot confer immunity from legal obligations. Licensed CopyChinese University of Hong Kong, 21/10/2008 08:06, Uncontrolled Copy, (c) BSI BSI 20081 BS 957:2008 1 Scope This British Standard
11、 specifies requirements for feeler gauges, comprising a series of gauging blades (blades) of graded thicknesses assembled in a protective sheath or supplied individually. These include requirements for dimensions which are expressed in metric and inch units. This standard is applicable to blades of
12、thicknesses: from 0.03 mm to 1.00 mm inclusive (metric units); and from 0.001 5 in to 0.025 in inclusive (inch units). 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated r
13、eferences, the latest edition of the referenced document (including any amendments) applies. BS EN ISO 6507, Metallic materials Vickers hardness test 3 General The purchaser shall state in his enquiry and order the particular combination of blades and length of blades required. NOTERecommendations r
14、egarding suitable combinations of blades are given in Annex A. 4 Material of blades 4.1 The blades shall be made of good quality steel and shall be hardened and tempered to a hardness of not less than 400 HV nor more than 600 HV1). NOTEConsideration should be given to the corrosion resistance and to
15、ughness of steel used. 4.2 Blades shall be tested for hardness in accordance with BS EN ISO 6507 as shown in Table 1 and Table 2. 1) BS EN ISO 6507. Table 1Hardness test metric units Thickness range mm Test load applied for 15 s kgf W 0.15 u 0.201 (9.8 N approx.) 0.205 (49 N approx.) Table 2Hardness
16、 test inch units Thickness range in Test load applied for 15 s kgf W 0.005 u 0.0081 (9.8 N approx.) 0.0085 (49 N approx.) Licensed CopyChinese University of Hong Kong, 21/10/2008 08:06, Uncontrolled Copy, (c) BSI BS 957:2008 2 BSI 2008 4.3 Blades of thicknesses less than 0.5 mm and 0.005 in shall be
17、 subjected to a scratch comparison test whereby the blade shall be placed on a hard, polished surface and scratched with a diamond tipped or hard steel stylus which has a tip radius of approximately 0.6 mm (0.02 in). The mark produced shall then be compared with a similar mark produced on a steel te
18、st piece of known hardness in the range 400450 HV. The mark shall be made in the same manner and using the same force on both the blade and the test piece. 5 Dimensions of blades Blade lengths, measured overall, shall be as follows. Blades up to 75 mm (3 in) long shall be approximately 12 mm ( in) w
19、ide at the heel and may be parallel or tapered, as may be ordered by the purchaser. Blades greater than 75 mm (3 in) shall be tapered for the outer part of their length so that the width at the tip is approximately 6 mm ( in). NOTEBlades 300 mm (12 in) or more in length may be wider. The other ends
20、of the blades shall be approximately semi-circular. 6 Finish The blades, throughout, shall be free from sharp edges. The blade surfaces and edges shall be free from deformations and have a smooth finish. mmin 753 1004 1506 3009 12 1 2 - - 1 4 - - Licensed CopyChinese University of Hong Kong, 21/10/2
21、008 08:06, Uncontrolled Copy, (c) BSI BSI 20083 BS 957:2008 7 Accuracy The mean thickness of a blade shall not depart from its nominal thickness by more than the amount given in Table 3, Column 2 or Table 4, Column 2. Any local variation in the thickness of a blade shall not exceed the amount given
22、in Table 3, Column 3 or Table 4, Column 3. 8 Sheath When the blades are fitted in a sheath they shall hinge smoothly and be adequately protected when folded into the sheath. The design of the hinge shall preferably facilitate the removal or replacement of blades. 9 Marking 9.1Blades Each blade shall
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