1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS EN ISO 898-5:2012Mechanical properties of fasteners made of carbon steel and alloy steelPart 5: Set screws and similar threaded fasteners with specified hardness classes Coars
2、e thread and fine pitch thread (ISO 898-5:2012)BS EN ISO 898-5:2012 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN ISO 898-5:2012.It supersedes BS EN ISO 898-5:1999 which is withdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee F
3、ME/9/1, Fasteners - Mechanical properties.A list of organizations represented on this committee can beobtained on request to its secretary.This publication does not purport to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. The British Standards I
4、nstitution 2012. Published by BSI StandardsLimited 2012ISBN 978 0 580 70352 2ICS 21.060.10Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Strategy Committee on 30 June 2012.Amendments i
5、ssued since publicationDate Text affectedEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 898-5 June 2012 ICS 21.060.10 Supersedes EN ISO 898-5:1998English Version Mechanical properties of fasteners made of carbon steel and alloy steel - Part 5: Set screws and similar threaded fasteners with
6、 specified hardness classes - Coarse thread and fine pitch thread (ISO 898-5:2012) Caractristiques mcaniques des lments de fixation en acier au carbone et en acier alli - Partie 5: Vis sans tte et lments de fixation filets similaires de classes de duret spcifies - Filetages pas gros et filetages pas
7、 fin (ISO 898-5:2012) Mechanische Eigenschaften von Verbindungselementen aus Kohlenstoffstahl und legiertem Stahl - Teil 5: Gewindestifte und hnliche Verbindungselemente mit Gewinde in festgelegten Hrteklassen - Regelgewinde und Feingewinde (ISO 898-5:2012) This European Standard was approved by CEN
8、 on 31 May 2012. 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 standards may
9、 be obtained on application to the CEN-CENELEC Management Centre 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 t
10、o the CEN-CENELEC Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Lux
11、embourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels 2012 CE
12、N All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 898-5:2012: EBS EN ISO 898-5:2012EN ISO 898-5:2012 (E) 3 Foreword This document (EN ISO 898-5:2012) has been prepared by Technical Committee ISO/TC 2 “Fasteners“ in collaboration wi
13、th Technical Committee CEN/TC 185 “Fasteners” the secretariat of which is held by DIN. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by December 2012, and conflicting national standards shall be wi
14、thdrawn at the latest by December 2012. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN and/or CENELEC shall not be held responsible for identifying any or all such patent rights. This document supersedes EN ISO 898-5:1998. Ac
15、cording to the CEN/CENELEC Internal Regulations, the national standards organisations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland,
16、Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. Endorsement notice The text of ISO 898-5:2012 has been approved by CEN as a EN ISO 898-5:2012 without any modification. BS EN IS
17、O 898-5:2012ISO 898-5:2012(E) ISO 2012 All rights reserved iiiContents PageForeword iv1 Scope 12 Normative references . 13 Terms and definitions . 24 Symbols and abbreviated terms . 25 Designation system 36 Materials . 37 Mechanical and physical properties 48 Applicability of test methods . 58.1 Man
18、ufacturers inspection 58.2 Suppliers inspection . 58.3 Purchasers inspection 59 Test methods 69.1 Hardness test . 69.2 Decarburization test . 79.3 Carburization test 109.4 Proof torque test for hexagonal socket set screws and hexalobular socket set screws of hardness class 45H . 1110 Marking .1310.1
19、 General .1310.2 Manufacturers identification mark .1310.3 Marking set screws with hardness class 1310.4 Marking of packages 13Annex A (informative) Hydrogen embrittlement relief after electroplating of set screws .14Bibliography .15BS EN ISO 898-5:2012ISO 898-5:2012(E)ForewordISO (the International
20、 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. Each member body interested in a subject for which a technical committee has been est
21、ablished 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 International Electrotechnical Commission (IEC) on all matters of electrotechnical standardiz
22、ation.International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting
23、. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote.Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such pa
24、tent rights.ISO 898-5 was prepared by Technical Committee ISO/TC 2, Fastener, Subcommittee SC 11, Fasteners with metric external thread.This third edition cancels and replaces the second edition (ISO 898-5:1998), which has been technically revised.ISO 898 consists of the following parts, under the g
25、eneral title Mechanical properties of fasteners made of carbon steel and alloy steel: Part 1: Bolts, screws and studs with specified property classes Coarse thread and fine pitch thread Part 2: Nuts with specified property classes Coarse thread and fine pitch thread Part 5: Set screws and similar th
26、readed fasteners with specified hardness classes Coarse thread and fine pitch thread Part 6: Nuts with specified proof load values Fine pitch thread Part 7: Torsional test and minimum torques for bolts and screws with nominal diameters 1 mm to 10 mmiv ISO 2012 All rights reservedBS EN ISO 898-5:2012
27、INTERNATIONAL STANDARD ISO 898-5:2012(E)Mechanical properties of fasteners made of carbon steel and alloy steel Part 5: Set screws and similar threaded fasteners with specified hardness classes Coarse thread and fine pitch thread1 ScopeThis part of ISO 898 specifies mechanical and physical propertie
28、s of set screws and similar threaded fasteners made of carbon steel or alloy steel when tested at an ambient temperature range of 10 C to 35 C. Fasteners (the term used when set screws and similar threaded fasteners are considered all together) which conform to the requirements of this part of ISO 8
29、98 are evaluated at that ambient temperature range.Fasteners in conformance with this part of ISO 898 are classified to specified hardness classes and are intended for use under compressive stress only.NOTE Fasteners conforming to the requirements of this part of ISO 898 are used in applications ran
30、ging from -50 C to +150 C. It is the responsibility of users to consult an experienced fastener metallurgist for temperatures outside the range of -50 C to +150 C and up to a maximum temperature of +300 C when determining appropriate choices for a given application.This part of ISO 898 is applicable
31、 to set screws and similar threaded fasteners: made of carbon steel or alloy steel, having a triangular ISO metric screw thread in conformance with ISO 68-1, with a coarse pitch thread of M1,6 to M30, and a fine pitch thread of M81 to M302, with diameter/pitch combinations in conformance with ISO 26
32、1 and ISO 262, and having thread tolerances in conformance with ISO 965-1 and ISO 965-2.It does not specify requirements for such properties as tensile strength, shear strength, weldability, corrosion resistance, or the ability to withstand temperatures above +150 C or below -50 C.2 Normative refere
33、ncesThe 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 (including any amendments) applies.ISO 225, Fasteners Bolts, screws, studs and nu
34、ts Symbols and descriptions of dimensionsISO 965-1, ISO general-purpose metric screw threads Tolerances Part 1: Principles and basic data ISO 2012 All rights reserved 1BS EN ISO 898-5:2012ISO 898-5:2012(E)ISO 965-3, ISO general purpose metric screw threads Tolerances Part 3: Deviations for construct
35、ional screen threadsISO 6157-1, Fasteners Surface discontinuities Part 1: Bolts, screws and studs for general requirementsISO 6506-1, Metallic materials Brinell hardness test Part 1: Test methodISO 6507-1, Metallic materials Vickers hardness test Part 1: Test methodISO 6508-1, Metallic materials Roc
36、kwell hardness test Part 1: Test method (scales A, B, C, D, E, F, G, H, K, N, T)ISO 16426, Fasteners Quality assurance system3 Terms and definitionsFor the purposes of this document, the following terms and definitions apply.3.1base metal hardnesshardness closest to the surface (when traversing from
37、 core to outside diameter) just before an increase or decrease occurs, denoting carburization or decarburization, respectively3.2carburizationresult of increasing surface carbon to a content above that of the base metal3.3decarburizationloss of carbon at the surface of a steel fastener3.4partial dec
38、arburizationdecarburization with sufficient loss of carbon to cause a lighter shade of tempered martensite and a significantly lower hardness than that of the adjacent base metal, without, however, showing ferrite grains under metallographic examination3.5ferritic decarburizationdecarburization with
39、 sufficient loss of carbon to cause a lighter shade of tempered martensite and a significantly lower hardness than that of the adjacent base metal, with the presence of ferrite grains or grain boundary network under metallographic examination3.6complete decarburizationdecarburization with sufficient
40、 carbon loss to show only clearly defined ferrite grains under metallographic examination3.7performance hardnesshardness determined on the surface as near as practicable to the centre position of the point end of the screw4 Symbols and abbreviated termsFor the purposes of this document, the symbols
41、and abbreviated terms given in ISO 225 and ISO 965-1 and the following apply.2 ISO 2012 All rights reservedBS EN ISO 898-5:2012ISO 898-5:2012(E)Symbol or abbreviated termMeaning UnitD Diameter of indenter for Brinell hardness test mmd Nominal thread diameter mmE Height of non-decarburized zone in th
42、read mme Width across corners mmF Applied force to determine Brinell hardness NG Depth of complete decarburization in thread mmH Height of fundamental triangle mmH1Height of external thread in maximum material condition mmP Pitch of thread mms Width across flats mmt Depth of the internal driving fea
43、ture mmmin Abbreviated subscript added to symbol to denote minimum value 5 Designation systemThe hardness classes are designated as specified in Table 1.The numerical part of the designation represents 1/10 of the minimum Vickers hardness.The letter H refers to the hardness.Table 1 Designations of h
44、ardness classes in relation to Vickers hardnessHardness class designation14H 22H 33H 45HVickers hardness, HV min 140 220 330 450The designation system of this part of ISO 898 may be used for sizes outside the limits laid down in this clause (e.g. d 30 mm), provided all applicable mechanical and phys
45、ical requirements in accordance with Tables 2 and 3 are met.6 MaterialsTable 2 specifies limits for the chemical composition of steels for the different hardness classes of fasteners. The chemical composition shall be assessed in accordance with the relevant International Standards.NOTE National reg
46、ulations imposing a restriction or prohibition on certain chemical elements can apply; they are expected to be taken into account in the countries or regions concerned. ISO 2012 All rights reserved 3BS EN ISO 898-5:2012ISO 898-5:2012(E)Table 2 Steel specificationsHardness class Material Heat treatme
47、ntaChemical composition limit (cast analysis, %)bC P Smax. min. max. max.14H Carbon steelc 0,50 0,11 0,1522H Carbon steeldQuenched and tempered 0,50 0,19 0,05 0,0533H Carbon steeldQuenched and tempered 0,50 0,19 0,05 0,0545HCarbon steeldeQuenched and tempered 0,50 0,45 0,05 0,05Carbon steel with add
48、itivesd(e.g. Boron or Mn or Cr)Quenched and tempered 0,50 0,28 0,05 0,05Alloy steeldfQuenched and tempered 0,50 0,30 0,05 0,05aCase hardening is not allowed.bIn case of dispute, the product analysis applies.cFree-cutting steel may be used, with maximum lead content 0,35 %, maximum phosphorus content
49、 0,11 % and maximum sulfur content 0,34 %.dSteel with a maximum lead content of 0,35 % may be used.eFor d M16 only.fThis alloy steel shall contain at least one of the following elements in the minimum quantity given: chromium 0,30 %, nickel 0,30 %, molybdenum 0,20 %, vanadium 0,10 %. Where elements are specified in combinations of two, three or four and have lower alloy contents than those given above in this footnote, the limit value to be applied for steel class d
