BS 1916-1-2009 Limits and fits for engineering nPart 1 Guide to limits and tolerances《工程用极限与配合 第1部分 极限与公差指南》.pdf
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1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI British StandardsWB9423_BSI_StandardColCov_noK_AW:BSI FRONT COVERS 5/9/08 12:55 Page 1Limits and fits for engineeringPart 1: Guide to limits and tolerancesBS 1916-1:2009BS 1916-1:2009 BRITISH STANDAR
2、DPublishing and copyright informationThe BSI copyright notice displayed in this document indicates when the document was last issued. BSI 2009ISBN 978 0 580 65212 7ICS 17.040.10The following BSI references relate to the work on this standard: Committee reference TDW/4 Draft for comment 09/30192598 D
3、CPublication historyFirst published March 1953Second (present) edition, September 2009Amendments issued since publicationDate Text affected BRITISH STANDARD BSI 2009 iBS 1916-1:2009ContentsForeword ii1 Scope 12 Normative references 13 Terms and definitions 14 Basis of conversion 25 Diameter steps 36
4、 Explanation of the system 37 Terminology 88 Selection of limits 89 Initial selection for normal use 810 Gauge limits 1011 Equivalent fits 1012 Limits for holes and shafts 10AnnexesAnnex A (informative) Rules for rounding-off tolerances 27Annex B (informative) Derivation of fundamental deviations 28
5、Annex C (informative) Special notes on tables of limits 30Bibliography 31List of figuresFigure 1 Diagram showing the disposition of limits and tolerances (Basic hole) 2Figure 2 Tolerance zones for holes arranged according to symbol 6Figure 3 Tolerance zones for shafts arranged according to symbol 7F
6、igure 4 Recommended selection of fits for general engineering requirements, basic hole system 9List of tablesTable 1 Fundamental tolerances of grades 1 to 16 5Table 2 Limits for holes (inch units) 11Table 3 Limits for shafts (inch units) 19Table A.1 Preferred series of tolerances 27Table B.1 Method
7、of determining the fundamental deviations for the various fits 28Summary of pagesThis document comprises a front cover, an inside front cover, pages i to ii, pages 1 to 32, an inside back cover and a back cover.BS 1916-1:2009ii BSI 2009BRITISH STANDARDForewordPublishing informationThis British Stand
8、ard is published by BSI and came into effect on 30 September 2009. It was prepared by Technical Committee TDW/4, Technical product realization. A list of organizations represented on this committee can be obtained on request to its secretary.SupersessionThis British Standard supersedes BS 1916-1:195
9、3, which is withdrawn.Relationship with other publicationsThis British Standard is published in three parts:Part 1 Guide to limits and tolerances;Part 2 Guide to the selection of fits in BS 1916-1;Part 3 Guide to tolerances, limits and fits for large diameters.The ISO 286 (BS EN 20286) series establ
10、ishes the ISO code-system for tolerances of linear sizes and is published in the following parts:ISO 286-1 (BS EN 20286-1), ISO system of limits and fits Part 1: Bases of tolerances, deviations and fits;ISO 286-2 (BS EN 20286-2), ISO system of limits and fits Part 2: Tables of standard tolerance gra
11、des and limit deviations for holes and shafts.The ISO 286 series covers the metric system of limits and fits; the BS 1916 series provides guidance and recommendations on the equivalent inch system (imperial).Information about this documentIn view of the time elapsed since its original publication in
12、 1953, this British Standard was reviewed in detail in 2009. It was decided that the technical provisions of the previous edition were still generally applicable, but the figures have been redrawn for ease of use, the wording of some guidance updated for clarity, and the opportunity was taken to upd
13、ate references to other standards.Use of this documentAs a guide, this part of BS 1916 takes the form of guidance and recommendations. It should not be quoted as if it were a specification or a code of practice and claims of compliance cannot be made to it.Contractual and legal considerationsThis pu
14、blication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application.Compliance with a British Standard cannot confer immunity from legal obligations.BRITISH STANDARD BSI 2009 1BS 1916-1:20091 ScopeThis part of BS 1916 gives guidance on
15、tolerances, limits and fits for engineering sizes up to 19.69 in. The recommendations apply particularly to fits between cylindrical parts, designated as “holes” and “shafts”, in which case the term “size” refers to the diameter of the mating parts. The data may also be applied in appropriate cases,
16、 by suitable selection of the grades of allowance and tolerances, to fits between other than cylindrical mating parts, in which case the “size” refers to a length, width or other dimension instead of to a diameter.The system described in this British Standard comprises suitable combinations of 16 gr
17、ades of tolerance and 21 types of fit for both hole and shaft, ranging from fits of extreme interference to those of extreme clearance. All but very exceptional engineering requirements are covered, from very coarse work to fine gauge manufacture.A selection of fits for general use is given in Figur
18、e 4, and further guidance on tolerances for shafts and holes for a wide range of fits is given in Part 2 of this British Standard, but it is intended that a particular industry or organization extracts and uses those limits which suit its own product. A unilateral hole basis system is recommended bu
19、t a full range of holes suitable for use on a shaft basis system, unilateral or bilateral, is also included in the tables.2 Normative referencesThe following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated
20、 references, the latest edition of the referenced document (including any amendments) applies.BS 969, Specification for limits and tolerances on plain limit gaugesBS 8888, Technical product specification Specification3 Terms and definitionsFor the purposes of this part of BS 1916, the following term
21、s and definitions apply.NOTE The basic terms used in this standard are illustrated in Figure 1.3.1 fundamental tolerancessixteen grades of tolerance for each size range on which the system is basedNOTE See Clause 6 and Table 1.3.2 deviationsalgebraic amounts by which the limits of size are greater (
22、+) or less () than the nominal sizeNOTE The deviations for the basic member of a mating pair are identical with the limits of tolerance for that member. The difference between the deviations for each member is equal to the tolerance for that member.BS 1916-1:20092 BSI 2009BRITISH STANDARDFigure 1 Di
23、agram showing the disposition of limits and tolerances (Basic hole)13 426111029548712 13 14LHKey1 Fundamental deviation2 Maximum interference (allowance)3 Tolerance4 Maximum clearance5 Minimum clearance (allowance)6 Minimum interference7 Nominal size8 Undersize hole9 Limits for size of shaft10 Limit
24、s for size of hole11 Oversize hole12 Clearance13 Transition14 Interference4 Basis of conversionIn order to obtain fit interchangeability between parts made to the metric system of limits and fits (see BS EN 20286) and to the equivalent inch system, the inch tolerance values have been obtained by dir
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