1、BS 957:2008Specification for feeler gaugesICS 17.040.30NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBRITISH STANDARDIncorporating Corrigendum No.1Publishing and copyright informationThe BSI copyright notice displayed in this document indicates when the document was last issu
2、ed.The following BSI references relate to the work on this standard:Committee reference TDW/4Draft for comment 08/30178090 DCPublication historyBS 957 (inch units) first published July 1941 (renumbered as BS 957-1 in July 1969)BS 957-2 (metric units) first published July 1969BS 957 (inch and metric)
3、 (present edition) published 30 September 2008BS 957:2008Amendments issued since publicationAmd. No. Date Text affected BSI 2009ISBN978 0 580 687440C1 Corrections to Table 4, Column 1September 2009 iBS 957:2008ContentsForeword ii1 Scope 12 Normative references 13 General 14 Material of blades 15 Dim
4、ensions of blades 26 Finish 27 Accuracy 8 Sheath 39 Marking 310 Protection against climatic conditions 4AnnexesAnnex A (informative) Recommended combinations of blades 5List of tablesTable 1 Hardnesstest metric units 1Table 2 Hardnesstest inch units 1Table 3 Tolerances on thickness of blades metric
5、units 3Table 4 Tolerances on thickness of blades inch units 3Table A.1 Combination of blades metric units 5Table A.2 Combination of blades inch units 6Summary of pagesThis document comprises a front cover, an insidefront cover, pages iand ii, pages 1 to 6, an inside back cover and a back cover. BSI
6、20092BS 957:2008ii ForewordPublishing informationThis 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 organizationsrepresented on this committee can be obtained on request to its s
7、ecretary.SupersessionThis British Standard supersedes BS 957-1:1941 and BS 957-2:1969, which are withdrawn.Information about this documentThis British Standard has been fully revised to bring it up to date.Presentational conventionsThe provisions of this standard are presented in roman (i.e. upright
8、) 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 not constitute a normative element.Contractual and legal considerationsThis publication does not
9、 purport to include all the necessary provisions of a contract. Users are responsible for its correct application.Compliance with a British Standard cannot conferimmunity from legal obligations.BSI 2009 1BS 957:20081ScopeThis British Standard specifies requirements for feeler gauges, comprising a se
10、ries 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 thicknesses:from 0.03 mm to 1.00 mm inclusive (metric units
11、); andfrom 0.001 5 in to 0.025 in inclusive (inch units).2Normative referencesThe following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies.For undated references, the latest edition of the referenced document (includi
12、ng any amendments) applies.BS EN ISO 6507, Metallic materials Vickers hardness test3GeneralThe purchaser shall state in his enquiry and order the particular combination of blades and length of blades required.NOTE Recommendations regarding suitable combinations of blades are given in Annex A.4Materi
13、al of blades4.1 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).NOTE Consideration should be given to the corrosion resistance and toughness of steel used. 4.2 Blades shall be tested for hardness in accord
14、ance with BS EN ISO 6507 as shown in Table 1 and Table 2.1) BS EN ISO 6507.Table 1 Hardness test metric unitsThickness rangemmTest load applied for 15 skgfW 0.15 u 0.20 1 (9.8 N approx.) 0.20 5 (49 N approx.)Table 2 Hardness test inch unitsThickness rangeinTest load applied for 15 skgfW 0.005 u 0.00
15、81 (9.8 N approx.) 0.0085 (49 N approx.) BSI 2009BS 957:20082 4.3 Blades of thicknesses less than 0.5 mm and 0.005 in shall be subjected to a scratch comparison test whereby the blade shall be placed on a hard, polished surface and scratched with adiamond tipped or hard steel stylus which has a tip
16、radius ofapproximately 0.6 mm (0.02 in).The mark produced shall then be compared with a similar mark produced on a steel test 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.5Dimensions of bladesB
17、lade lengths, measured overall, shall be as follows.Blades up to 75 mm (3 in) long shall be approximately 12 mm ( in) wide 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 oftheir length so that the wi
18、dth at the tip is approximately 6 mm (in). NOTEBlades 300 mm (12 in) or more in length may be wider.The other ends of the blades shall be approximately semi-circular.6FinishThe blades, throughout, shall be free from sharp edges.The blade surfaces and edges shall be free from deformations and have a
19、smooth finish.mm in75 3100 4150 6300 91212-14-BSI 20097AccuracyThe 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 in Table
20、 3, Column 3 or Table 4, Column 3. 3BS 957:20088SheathWhen the blades are fitted in a sheath they shall hinge smoothly and beadequately protected when folded into the sheath. The design of the hinge shall preferably facilitate the removal or replacement of blades.9Marking9.1 BladesEach blade shall b
21、e legibly and permanently marked with its nominal thickness in:millimetres, e.g. 0.04; orthousandths of an inch.9.2 SheathThe sheath shall be legibly and permanently marked to indicate whether dimensions are expressed in metric or inch units and to display the manufacturers or vendors name or trade
22、mark.Table 3 Tolerances on thickness of blades metric units12 3Nominal thickness of blademmPermissible departure from nominal thicknessmmPermissible variation in local thickness of blademm 0.03 u 0.04 0.004 0.004 0.005 0.005 0.35 u 0.65 0.008 0.008 0.65 u 1.0 0.010 0.010Table 4 Tolerances on thickne
23、ss of blades inch units 0.04 u 0.35 BSI 20091Nominal thickness of blade in2Permissible departure from nominal thicknessin3Permissible variation in local thickness of bladein 0.000 20.000 30.000 20.000 30.015 0.020 0.0250.009 0.010 0.0120.006 0.007 0.0080.001 5 0.002 0.002 5 0.003 0.004 0.005BS 957:2
24、008410 Protection against climatic conditionsDuring storage and transit all feeler gauges shall be protected against climatic conditions with a suitable corrosion preventative.NOTE Examples of suitable corrosive preventatives include lanolin, plasticized resin and soft-film grease.BSI 2009 5BS 957:2
25、008Annex A (informative) Recommended combinations of bladesThe past practice of manufacturers in regard to the various combinations of blades assembled together in sets has been verydiverse.With a view to simplifying the considerable number of combinations at present listed, recommendedseries in met
26、ric and inch units are given in Table A.1 and Table A.2. These series are so devised as to furnish setsof the greatest utility with a minimum number of blades.The order in which the blades are given in the series below is not thatmost suitable for assembly. It is desirable that each thin blade shoul
27、d be given the maximum protection by being interleaved between two thicker blades.Table A.1 Combination of blades metric unitsSet 1mmSet 2mmSet 3mmSet 4mm0.03 A)0.04 A)0.05 0.05 0.05 0.050.060.070.080.090.10 0.10 0.10 0.100.15 0.15 0.15 0.150.20 0.20 0.20 0.200.25 0.25 0.250.30 0.30 0.30 0.300.350.4
28、0 0.40 0.40 0.400.450.50 0.50 0.50 0.500.550.60 0.600.650.70 0.700.750.80 0.800.850.90 0.900.951.00 1.00A) In view of the delicate nature of the 0.03 mm and 0.04 mm blades it is recommended that these blades beincluded in duplicate. BSI 2009BS 957:20086 Table A.2 Combination of blades inch unitsSet
29、7inSet 10inSet 15in0.001 5 A) 0.001 5 A)0.0020.002 0.0020.002 50.0030.003 0.0030.0040.004 0.0040.0050.005 0.0050.0060.006 0.0060.0070.0080.0080.0090.0100.010 0.0100.0120.0150.015 0.0150.0200.0200.025NOTE By combining not more than two blades, a sequence of thicknesses each may be obtained in Set 7 u
30、p toSet 15 up to 0.035 in. The inclusion ofSet 15 enables any thickness in half-thousandths to be obtained A) In view of the delicatenature of the 0.001 5 in blade it is recommendedthat this blade be included in duplicate in sets 10 and 15.advancing by consecutive steps of0.001 in0.021 in, in Set 10
31、 up to 0.026 in, and in the 0.001 5 in and 0 002 5 in blades in from 0.001 5 in up to 0.015 in by the combination of not more than two blades.BSI 2009This page deliberately left blankBS 957:2008BS 957:2008BSI Group Headquarters389 Chiswick High Road,London W4 4AL, UKTel +44 (0)20 8996 9001Fax +44 (0
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