BS-ISO-965-1-1998.pdf
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1、BRITISH STANDARD BS ISO 965-1: 1998 ISO general purpose metric screw threads Tolerances Part 1: Principles and basic data ICS 21.040.10 Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 06:04:22 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS ISO 965-1:1998 This British Standard, having been prep
2、ared under the direction of the Engineering Sector Committee, was published under the authority of the Standards Committee and comes into effect on 15 April 1999 BSI 03-2000 ISBN 0 580 32351 X National foreword This British Standard reproduces verbatim ISO 965-1:1998 and implements it as the UK nati
3、onal standard. The UK participation in its preparation was entrusted by Technical Committee FME/9, Bolts, nuts and accessories, to Subcommittee FME/9/3, Reference standards for fasteners, which has the responsibility to: aid enquirers to understand the text; present to the responsible international/
4、European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. A list of organizations represented on this subcommittee can be obtained on request to its secre
5、tary. Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Find” facility of the BSI Standards
6、 Electronic Catalogue. 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 pages T
7、his document comprises a front cover, an inside front cover, pages i and ii, the ISO title page, pages ii to iv, pages 1 to 17 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 f
8、ront cover. Amendments issued since publication Amd. No.DateComments Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 06:04:22 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS ISO 965-1:1998 BSI 03-2000i Contents Page National forewordInside front cover Forewordiii Text of ISO 965-11 Licensed Cop
9、y: sheffieldun sheffieldun, na, Sun Nov 26 06:04:22 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ii blank Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 06:04:22 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 06:04:22 GMT+00:00 2006, Uncontrol
10、led Copy, (c) BSI BS ISO 965-1:1988 ii BSI 03-2000 Contents Page Forewordiii 1Scope1 2Normative references1 3Definitions and symbols1 3.1Definitions1 3.2Symbols2 4Structure of the tolerance system2 5Designation3 5.1General3 5.2Designation of single-start screw threads3 5.3Designation of multiple-sta
11、rt screw threads4 5.4Designation of the left hand threads5 6Tolerance grades5 7Tolerance positions5 8Lengths of thread engagement8 9Crest diameter tolerances10 9.1Minor diameter tolerances of internal threads (TD1)10 9.2Major diameter tolerance of external thread (Td)10 10Pitch diameter tolerances11
12、 11Root contours14 12Recommended tolerance classes15 13Formulae16 13.1Fundamental deviations16 13.2Length of thread engagement16 13.3Crest diameter tolerances17 13.3.1 Tolerances for major diameter of external thread (Td), grade 617 13.3.2 Tolerances for minor diameter of internal thread (TD1), grad
13、e 617 13.4Pitch diameter tolerances17 13.4.1 Tolerances for pitch diameter of external thread (Td2)17 13.4.2 Tolerances for pitch diameter of internal thread (TD2)17 Figure 1 Position of tolerances with respect to zero line (basic size)2 Figure 2 Internal threads with tolerance position G5 Figure 3
14、Internal threads with tolerance position H5 Figure 4 External threads with tolerance positions e, f and g6 Figure 5 External threads with tolerance position h7 Figure 6 External root profile14 Table 1 Fundamental deviations for internal threads and external threads8 Table 2 Lengths of thread engagem
15、ent9 Table 3 Minor diameter tolerance of internal thread (TD1)10 Table 4 Major diameter tolerance of external thread (Td)11 Table 5 Pitch diameter tolerance of internal thread (TD2)12 Table 6 Pitch diameter tolerance of external thread (Td2)13 Table 7 Minimum root radii15 Table 8 Recommended toleran
16、ce classes for internal threads16 Table 9 Recommended tolerance classes for external threads16 Descriptors: Screw threads, ISO metric threads, form specifications, dimensional tolerances, designation, generalities. Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 06:04:22 GMT+00:00 2006, Uncon
17、trolled Copy, (c) BSI BS ISO 965-1:1988 BSI 03-2000iii Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees.
18、 Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the Interna
19、tional Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bod
20、ies casting a vote. International Standard ISO 965-1 was prepared by Technical Committee ISO/TC 1, Screw threads, Subcommittee SC 2, Tolerances. This third edition cancels and replaces the second edition (ISO 965-1:1980), which has been technically revised. ISO 965 consists of the following parts, u
21、nder the general title ISO general purpose metric screw threads Tolerances Part 1: Principles and basic data; Part 2: Limits of sizes for general purpose bolt and nut threads Medium quality; Part 3: Deviations for constructional screw threads; Part 4: Limits of sizes for hot-dip galvanized external
22、threads to mate with internal threads tapped with tolerance position H or G after galvanizing; Part 5: Limits of sizes for internal screw threads to mate with hot-dip galvanized external screw threads with maximum size of tolerance position h before galvanizing. Licensed Copy: sheffieldun sheffieldu
23、n, na, Sun Nov 26 06:04:22 GMT+00:00 2006, Uncontrolled Copy, (c) BSI iv blank Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 06:04:22 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS ISO 965-1:1988 BSI 03-20001 1 Scope This part of ISO 965 specifies the basic profile for ISO general purpose me
24、tric screw threads (M) conforming to ISO 261. The tolerance system refers to the basic profile in accordance with ISO 68-1. 2 Normative references The following standards contain provisions which, through reference in this text, constitute provisions of this part of ISO 965. At the time of publicati
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