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1、BRITISH STANDARD BS EN 20898-1:1992 ISO 898-1:1988 Reprinted, incorporating Amendment No. 1 Mechanical properties of fasteners Part 1: Bolts, screws and studs The European Standard EN 20898-1:1991 has the status of a British Standard Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 01 05:13:23 GM
2、T+00:00 2006, Uncontrolled Copy, (c) BSI BS EN 20898-1:1992 This British 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 01-1999 The
3、 following BSI references relate to the work on this standard: Committee reference GME/9 Draft for comment 86/74337 DC ISBN 0 580 20628 9 Cooperating organizations The European Committee for Standardization (CEN), under whose supervision this European Standard was prepared, comprises the national st
4、andards organizations of the following countries. AustriaOesterreichisches Normungsinstitut BelgiumInstitut belge de normalisation DenmarkDansk Standardiseringsraad FinlandSuomen Standardisoimisliito, r.y. FranceAssociation franaise de normalisation GermanyDeutsches Institut fr Normung e.V. GreeceHe
5、llenic Organization for Standardization IcelandTechnological Institute of Iceland IrelandNational Standards Authority of Ireland ItalyEnte Nazionale Italiano di Unificazione LuxembourgInspection du Travail et des Mines NetherlandsNederlands Normalisatie-instituut NorwayNorges Standardiseringsforbund
6、 PortugalInstituto Portugus da Qualidade SpainAsociacin Espaola de Normalizacin y Certificacin SwedenStandardiseringskommissionen i Sverige SwitzerlandAssociation suisse de normalisation United KingdomBritish Standards Institution Amendments issued since publication Amd. No.DateComments 7300July 199
7、2Indicated by a sideline in the margin Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 01 05:13:23 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN 20898-1:1992 BSI 01-1999i Contents Page Cooperating organizationsInside front cover National forewordii Foreword2 1Scope and field of application3 2
8、References3 3Designation system3 4Materials3 5Mechanical properties6 6Mechanical properties to be determined7 7Minimum ultimate tensile loads and proofing loads8 8Test methods11 9Marking18 Annex Properties at elevated temperature20 National annex NA (informative)Inside back cover National annex NB (
9、informative)Inside back cover Figure 1 Test piece for tensile test12 Figure 2 Application of proofing load to full-size bolts13 Figure 3 Wedge loading of full-size bolts14 Figure 4 Head soundness test15 Figure 5 Zones of decarburization17 Figure 6 Hardness measurements for decarburization test17 Fig
10、ure 7 Examples of marking on hexagon bolts and screws18 Figure 8 Examples of marking on hexagon socket head cap screws18 Figure 9 Marking of stud19 Figure 10 Left-hand thread marking19 Figure 11 Alternative left-hand thread marking19 Table 1 System of coordinates4 Table 2 Steels5 Table 3 Mechanical
11、properties of bolts, screws and studs6 Table 4 Key to test programmes7 Table 5 Test programmes A and B for acceptance purposes7 Table 6 Minimum ultimate tensile loads ISO metric coarse pitch thread8 Table 7 Proofing loads ISO metric coarse pitch thread9 Table 8 Minimum ultimate tensile loads ISO met
12、ric fine pitch thread10 Table 9 Proofing loads ISO metric fine pitch thread10 Table 10 Hole diameters for wedge loading test14 Table 11 Wedge dimensions15 Table 12 Values of angle b15 Table 13 Values for H1 and E17 Table 14 Marking symbols18 Table 15 Identification marks for studs19 Table 16 Propert
13、ies at elevated temperature20 Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 01 05:13:23 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN 20898-1:1992 ii BSI 01-1999 National foreword This British Standard has been prepared under the direction of the General Mechanical Engineering Standards Pol
14、icy Committee and is the English language version of EN 20898-1 “Mechanical properties of fasteners Part 1: Bolts, screws and studs”, published by the European Committee for Standardization (CEN). EN 20898-1 was produced as a result of international discussion in which the UK took an active part. It
15、 is one of a series of standards that are under preparation based on ISO 898. This Part of this standard is based on ISO 898-1:1988 “Mechanical properties of fasteners Part 1: Bolts, screws and studs”, published by the International Organization for Standardization (ISO). BS EN 20898-2 is also publi
16、shed. BS 6104-1:1981, which was technically equivalent to ISO 898-1:1988, is now superseded by this British Standard and has been withdrawn in accordance with the CEN/CENELEC Internal Regulations. Attention is drawn to the fact that at a recent meeting of Technical Committee ISO/TC2/SC1 a resolution
17、 was approved which put forward an amendment to ISO 898-1:1988 (upon which BS EN 20898-1:1992 is based), altering clause 1 by rewriting the last paragraph, to insert after + 300 C “(+ 250 C for 10.9)”. A British Standard does not purport to include all the necessary provisions of a contract. Users o
18、f 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 This document comprises a front cover, an inside front cover, pages i and ii, the EN title page, pages 2 to 20, an inside
19、back cover 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 front cover. Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 01 05:13:23 GMT+00:00 2006, Uncontrolled Copy, (c) B
20、SI EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 20898-1 February 1991 UDC 621.882.2-034.14:620.17 Descriptors: Fasteners, bolts, screws, studs, specifications, mechanical properties, tests, designation, marking English version Mechanical properties of fasteners Part 1: Bolts, screws and stud
21、s (ISO 898-1:1988) Caractristiques mcaniques des lments de fixation Partie 1: Boulons, vis et goujons (ISO 898-1:1988) Mechanische Eigenschaften von Verbindungselementen Teil 1: Schrauben (ISO 898-1:1988) This European Standard was approved by CEN on 1991-02-11. CEN members are bound to comply with
22、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 standards may be obtained on application to the Central Secretariat
23、 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 the Central Secretariat has the same status as the official ve
24、rsions. 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 European Committee for Standardization Comit Europen de Normali
25、sation Europisches Komitee fr Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels CEN 1991 Copyright reserved to all CEN members Ref. No. EN 20898-1:1991 E CEN European Committee for Standardization Comit Europen de Normalisation Europisches Komitee fr Normung Central Secretariat: rue d
26、e Stassart 36, B-1050 Brussels Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 01 05:13:23 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 20898-1:1991 BSI 01-1999 2 Foreword In 1989, ISO 898-1:1988 was submitted to the CEN Primary Questionnaire Procedure. According to the results of this question
27、naire, the BT asked CEN/TC 185 to prepare a prEN for submission to the Formal Vote. CEN/TC 185 decided to submit ISO 898-1:1988 to the Formal Vote procedure without modifications. The text of the International Standard ISO 898-1:1988 having been approved by CEN as a European Standard without modific
28、ations, the following countries are bound to implement this standard: Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. Endorsement notice The text of the International Stand
29、ard ISO 898-1:1988 was approved by CEN as a European Standard without modifications. NOTEIn Table 3, line 5.10, the sign “%” shall be added after the symbol A. In the first line of Table 5 and in the head-lines of Table 6 and Table 8, the symbol “Rm” shall be replaced by “Rmmin”. Licensed Copy: shef
30、fieldun sheffieldun, na, Wed Nov 01 05:13:23 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 20898-1:1991 BSI 01-19993 1 Scope and field of application This part of ISO 898 specifies the mechanical properties of bolts, screws and studs when tested at room temperature (see ISO 1). Properties will vary
31、at higher and lower temperature. This part of ISO 898 applies to bolts, screws and studs with nominal thread diameter d 39 mm), provided that all mechanical requirements of the property classes are met. 2 References ISO 1, Standard reference temperature for industrial length measurements. ISO 68, IS
32、O general purpose screw threads Basic profile. ISO 83, Steel Charpy impact test (U-notch). ISO 225, Fasteners Bolts, screws, studs and nuts Symbols and designations of dimensions. ISO 261, ISO general purpose metric screw threads General plan. ISO 262, ISO general purpose metric screw threads Select
33、ed sizes for screws, bolts and nuts. ISO 273, Fasteners Clearance holes for bolts and screws. ISO 965-1, ISO general purpose metric screw threads Tolerances Part 1: Principles and basic data. ISO 965-2, ISO general purpose metric screw threads Tolerances Part 2: Limits or sizes for general purpose b
34、olt and nut threads Medium quality. ISO 6157-1, Fasteners Surface discontinuities Part 1: Bolts, screws and studs for general requirements.1) ISO 6157-3, Fasteners Surface discontinuities Part 3: Bolts, screws and studs for special requirements.1) ISO 6506, Metallic materials Hardness test Brinell t
35、est. ISO 6507-1, Metallic materials Hardness test Vickers test Part 1: HV 5 to HV 100. ISO 6507-2, Metallic materials Hardness test Vickers test Part 2: HV 0,2 to less than HV 5. ISO 6508, Metallic materials Hardness test Rockwell test Scales A, B, C, D, E, F, G, H, K. ISO 6892, Metallic materials T
36、ensile testing. 3 Designation system The designation system for property classes of bolts, screws and studs is shown in Table 1. The abscissae show the nominal tensile strength values, Rm, in newtons per square millimetre, while the ordinates show those of the minimum elongation after fracture, A mi
37、n., as a percentage. The property class symbol consists of two figures: the first indicates 1/100 of the nominal tensile strength in newtons per square millimetre (see Rm in Table 3); the second figure indicates 10 times the ratio between lower yield stress ReL (or proof stress Rp0,2) and nominal te
38、nsile strength Rm (yield stress ratio). The multiplication of these two figures will give 1/10 of the yield stress in newtons per square millimetre. Lower yield stress ReL (or proof stress Rp0,2) and minimum tensile strength Rm are equal to or greater than the nominal values (see Table 3). 4 Materia
39、ls Table 2 specifies steels for the different property classes of bolts, screws and studs. The minimum tempering temperatures listed in Table 2 are mandatory for property classes 8.8 to 12.9 in all cases. The chemical composition limits are mandatory only for those fasteners which are not subject to
40、 tensile testing. 1) At present at the stage of draft. Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 01 05:13:23 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 20898-1:1991 4 BSI 01-1999 Table 1 System of coordinates NOTEAlthough a great number of property classes are specified in this part of
41、ISO 898, this does not mean that all classes are appropriate for all items. Further guidance for application of the specific property classes is given in the relevant product standard. For non-standard items, it is advisable to follow as closely as possible the choice already made for similar standa
42、rd items. 1) Applies only to thread diameter d 16 mmb 5.1 and 5.2 Tensile strength, Rmd,e, N/mm2 nom.3004005006008008009001 000 1 200 min.3304004205005206008008309001 040 1 220 5.3Vickers hardness, HV, F 98 N min.95120130155160190250255290320385 max.250320335360380435 5.4Brinell hardness, HB, F = 30
43、 D2 min.90114124147152181238242276304366 max.238304318342361414 5.5Rockwell hardness, HR min. HRB526771798289 HRC2223283239 max. HRB99,5 HRC 3234373944 5.6Surface hardness, HV 0,3max. f 5.7Lower yield stress, ReLg, N/mm2 nom.180240320300400480 min.190240340300420480 5.8Proof stress, Rp0,2, N/mm2 nom
44、. 6406407209001 080 min. 6406607209401 100 5.9 Stress under proofing load, SpSp/ReL or Sp/ Rp0,2 0,940,940,910,930,900,920,910,910,900,880,88 N/mm2180225310280380440580600650830970 5.10Elongation after fracture, Amin.2522142010812121098 5.11Strength under wedge loadingeThe values for full size bolts
45、 and screws (not studs) shall not be smaller than the minimum values for tensile strength shown in 5.2 5.12Impact strength, Jmin. 25 3030252015 5.13Head soundnessno fracture 5.14 Minimum height of non-decarburized thread zone, E Maximum depth of complete decarburization, G mm0,015 a For bolts of pro
46、perty class 8.8 in diameters d 2,5d. Minimum hardness applies to products of length l 4 mm and length l 2,5d Test decisive for acceptance a Also bolts and screws with special head or shank configurations which are weaker than the threaded section. (These procedures apply to mechanical but not chemic
47、al properties.) Test group Property Test programme ATest programme B Test method Property class Test method Property class 3.6,8.8, 9.83.6, 4.68.8, 9.8 4.6,10.94.8, 5.610.9 5.612.95.8, 6.812.9 I 5.1 and 5.2 Minimum tensile strength, Rm8.1Tensile test8.2Tensile testa 5.3Minimum hardnessb 8.3Hardness
48、testc 8.3Hardness testc 5.4 and 5.5 Maximum hardness 5.6Maximum surface hardness II 5.7Minimum lower yield stress, ReL8.1Tensile test 5.8Proof stress, Rp0,28.1Tensile test 5.9Stress under proofing load, Sp 8.4 Proofing load test III 5.10Minimum elongation after fracture, A min. 8.1Tensile test 5.11S
49、trength under wedge loadingd 8.5 Wedge loading testa IV 5.12Minimum impact strength 8.6Impact testef8.6 5.13Head soundnessg8.7 Head soundness test V 5.14Maximum decarburized zone8.8 Decarburization test 8.8 Decarburization test 5.15Minimum tempering temperature 8.9 Retempering test 8.9 Retempering test 5.16Su