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1、BRITISH STANDARD BS EN 24033:1992 ISO 4033:1979 Hexagon nuts, style 2 Product grades A and B The European Standard EN 24033:1991 has the status of a British Standard Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 01 05:13:46 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN 24033:1992 This Briti
2、sh Standard, having been prepared under the direction of the General Mechanical Engineering Standards Policy Committee, was published under the authority of the Standards Board and comes into effect on 1 April 1992 BSI 08-1999 The following BSI references relate to the work on this standard: Committ
3、ee reference GME/9 Special announcement in BSI News, February 1990 ISBN 0 580 20712 9 Cooperating organizations The European Committee for Standardization (CEN), under whose supervision this European Standard was prepared, comprises the national standards organizations of the following countries. Au
4、striaOesterreichisches Normungsinstitut BelgiumInstitut belge de normalisation DenmarkDansk Standardiseringsraad FinlandSuomen Standardisoimisliito, r.y. FranceAssociation franaise de normalisation GermanyDeutsches Institut fr Normung e.V. GreeceHellenic Organization for Standardization IcelandTechn
5、ological Institute of Iceland IrelandNational Standards Authority of Ireland ItalyEnte Nazionale Italiano di Unificazione LuxembourgInspection du Travail et des Mines NetherlandsNederlands Normalisatie-instituut NorwayNorges Standardiseringsforbund PortugalInstituto Portugus da Qualidade SpainAsocia
6、cin Espaola de Normalizacin y Certificacin SwedenStandardiseringskommissionen i Sverige SwitzerlandAssociation suisse de normalisation United KingdomBritish Standards Institution Amendments issued since publication Amd. No.DateComments Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 01 05:13:46
7、GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN 24033:1992 BSI 08-1999i Contents Page Cooperating organizationsInside front cover National forewordii Foreword2 Text of EN 240333 National annex NA (informative) Committees responsibleInside back cover National annex NB (informative) Cross-referencesI
8、nside back cover Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 01 05:13:46 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN 24033:1992 ii BSI 08-1999 National foreword This British Standard has been prepared under the direction of the General Mechanical Engineering Standards Policy Committee a
9、nd is the English language version of EN 24033:1991 “Hexagon nuts, style 2 Product grades A and B”, published by the European Committee for Standardization (CEN). It is identical with ISO 4033:1979, published by the International Organization for Standardization (ISO). EN 24033:1991 was produced as
10、a result of international discussion in which the UK took an active part. 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
11、immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, the EN title page, pages 2 to 8, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This w
12、ill be indicated in the amendment table on the inside front cover. Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 01 05:13:46 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 24033 October 1991 UDC 621.882.31 Descriptors: Fasteners, nuts, fasteners
13、, hexagonal nuts, specifications, dimensions, designation English version Hexagon nuts, style 2 Product grades A and B (ISO 4033:1979) Ecrous hexagonaux, style 2 Classes de produit A et B (ISO 4033:1979) Sechskantmuttern, Typ 2 Produktklassen A und B (ISO 4033:1979) This European Standard was approv
14、ed by CEN on 1991-10-10. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national stand
15、ards may be obtained on application to the Central Secretariat or to any CEN member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to
16、the Central Secretariat has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CEN E
17、uropean Committee for Standardization Comit Europen de Normalisation Europisches Komitee fr Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels CEN 1991 Copyright reserved to all CEN members Ref. No. EN 24033:1991 E Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 01 05:13:46 GMT+00:
18、00 2006, Uncontrolled Copy, (c) BSI EN 24033:1991 BSI 08-1999 2 Foreword In 1990, ISO 4033:1979 was submitted to the CEN P.Q.-procedure. Following the positive result of the P.Q., CEN/BT agreed to submit ISO 4033:1979 with the following modifications to Formal Vote. In the French version, replace: “
19、boulon” by “vis partiellement filete”, “vis” by “vis entirement filete”, “boulon, vis” by “vis” “classe de produit” by “grade”, “classe de caractristique” by “classe de qualit” In accordance with the Common CEN/CENELEC Rules, the following countries are bound to implement this European Standard: Aus
20、tria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. Contents Page Foreword2 0Introduction3 1Scope and field of application3 2References3 3Dimensions3 4Specifications and reference
21、 standards5 5Designation5 Annex6 Table 16 Table 27 Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 01 05:13:46 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 24033:1991 BSI 08-19993 0 Introduction This International Standard is part of the complete ISO product standards series on hexagon drive fa
22、steners. The series comprises: 1 Scope and field of application This International Standard gives specifications for hexagon nuts, style 2, with metric dimensions and thread diameters from 5 up to and including 36 mm, with product grade A for sizes u M16 and product grade B for sizes M16. NOTEFor he
23、xagon nuts style 1, see ISO 4032. 2 References ISO 261, ISO general purpose metric screw threads General plan. ISO 898, Mechanical properties of fasteners. ISO 965, ISO general purpose metric screw threads Tolerances. ISO 4759-1, Tolerances for fasteners Part 1: Bolts, screws and nuts with thread di
24、ameters W 1,6 u 150 mm and product grades A, B and C. 3 Dimensions a) Hexagon head bolts (ISO 4014, ISO 4015 and ISO 4016) b) Hexagon head screws (ISO 4017 and ISO 4018) c) Hexagon nuts (ISO 4032, ISO 4033, ISO 4034, ISO 4035 and ISO 4036) d) Hexagon flanged bolts e) Hexagon flanged screws(in prepar
25、ation) f) Hexagon flanged nuts g) Structural bolting Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 01 05:13:46 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 24033:1991 4 BSI 08-1999 Dimensions in millimetres Thread size dM5M6M8M10M12(M14) P a 0,811,251,51,752 cmax. 0,50,50,60,60,60,6 da min. 5
26、68101214 max. 5,756,758,7510,81315,1 dwmin. 6,98,911,614,616,619,6 emin. 8,7911,0514,3817,7720,0323,35 m max. 5,15,77,59,31214,1 min. 4,85,47,148,9411,5713,4 mmin. 3,844,325,717,159,2610,7 s max. 81013161821 min. 7,789,7812,7315,7317,7320,67 Thread size dM16M20M24M30M36 P a 22,533,54 cmax.0,80,80,80
27、,80,8 da min. 1620243036 max. 17,321,625,932,438,9 dwmin. 22,527,733,242,751,1 emin. 26,7532,9539,5550,8560,79 m max. 16,420,323,928,634,7 min. 15,71922,627,333,1 mmin. 12,615,218,121,826,5 s max. 2430364655 min. 23,6729,16354553,8 a P = pitch of the thread. Sizes in brackets should be avoided if po
28、ssible. Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 01 05:13:46 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 24033:1991 BSI 08-19995 4 Specifications and reference standards 5 Designation Example for the designation of a hexagon nut with metric thread d = M12 and property class 9: Hexagon n
29、ut ISO 4033 M12-9 MaterialSteel Thread Tolerance6H International StandardsISO 261, ISO 965 Mechanical properties Classes912 International StandardISO 898-2 Tolerances Product gradeA for products with d k M 16 B for products with d M 16 International StandardISO 4759-1 Finish as processed Requirement
30、s for electroplating are covered in ISO . . .a If different electroplating requirements are desired or if requirements are needed for other finishes, they should be negotiated between customer and supplier. Acceptability For acceptance procedure see ISO . . .a. a In preparation. Licensed Copy: sheff
31、ieldun sheffieldun, na, Wed Nov 01 05:13:46 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 24033:1991 6 BSI 08-1999 Annex This annex is included for explanatory and informative purposes only and is not to be considered as part of this International Standard. This International Standard incorporates s
32、ome changes, primarily in width across flats, from the previous metric practice in a number of countries. These changes were made to achieve international agreement and to improve product design and utilization of material. At its meeting in May 1977, ISO/TC 2 studied several technical reports analy
33、sing design considerations influencing determination of the best series of widths across flats for hexagon bolts, screws and nuts. A primary technical objective was to achieve a logical ratio between underhead bearing surface area (which determines the magnitude of the compressive stress on the bolt
34、ed members) and the tensile stress area of the screw thread (which governs the clamping force which can be developed by tightening the fastener.) Table 1 lists the ratios for the sizes selected by ISO/TC 2 to be ISO standard (bold type) and in addition four sizes (light type) which currently are bei
35、ng produced and used in substantial quantities in many countries of the world. The four sizes (widths across flats of 15, 17, 19 and 22 mm) will be phased out of production and use. During a transitional period, to assist designers and manufacturers, and in particular to give needed information for
36、maintenance and repair requirements, the dimensions of the four sizes are given in Table 2. Table 1 Nominal thread diameter Width across flats a mmmm 581,08 6101,44 8131,23 150,90 10161,30 171,73 12 180,91 191,16 14 210,96 221,24 16241,02 20300,95 24360,86 30461,02 36551,04 a Calculation based on cl
37、earance holes ISO 273 (revised), medium series. Annular bearing area Thread stress area - - Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 01 05:13:46 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 24033:1991 BSI 08-19997 Table 2 Thread size dM10M12M14 P a 1,51,752 dwmin.13,615,617,420,4 emin.16
38、,6418,9021,1024,49 m max.108,811,313,13 min.9,648,4410,8712,7 mmin.7,76,758,710,2 s max.15171922 min.14,7316,7318,6721,67 a P = pitch of the thread. Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 01 05:13:46 GMT+00:00 2006, Uncontrolled Copy, (c) BSI 8 blank Licensed Copy: sheffieldun sheffield
39、un, na, Wed Nov 01 05:13:46 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN 24033:1992 BSI 08-1999 National annex NA (informative) Committees responsible The United Kingdom participation in the preparation of this European Standard was entrusted by the General Mechanical Engineering Standards Polic
40、y Committee (GME/-) to Technical Committee GME/9 upon which the following bodies were represented: BEAMA Ltd. British Constructional Steelwork Association Ltd. British Industrial Fasteners Federation British Railways Board British Steel Industry British Steel Industry (Wire Section) Gauge and Tool M
41、akers Association Ministry of Defence Society of Motor Manufacturers and Traders Ltd. Washer Manufacturers Association of Great Britain The following bodies were also represented in the drafting of the standard, through subcommittees and panels: Defence Manufacturers Association General Municipal Bo
42、ilermaker and Allied Trades Union Screw Thread Tool Manufacturers Association Society of British Aerospace Companies Ltd. National annex NB (informative) Cross-references Publication referred toCorresponding British Standard ISO 261:1973BS 3643 ISO metric screw threads Part 1:1981 Principles and bas
43、ic data ISO 4759-1:1979BS 6322 Tolerances for fasteners Part 1:1982 Specification for tolerances of bolts, screws and nuts with thread diameters U 1.6 mm and k 150 mm and product grades A, B and C Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 01 05:13:46 GMT+00:00 2006, Uncontrolled Copy, (c)
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