1、BS EN ISO10644:2009ICS 21.060.10; 21.060.30NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBRITISH STANDARDScrew and washerassemblies madeof steel with plainwashers Washerhardness classes 200HV and 300 HVThis British Standardwas published under theauthority of the StandardsPoli
2、cy and StrategyCommittee on 31 July 2009 BSI 2009ISBN 978 0 580 58314 8Amendments/corrigenda issued since publicationDate CommentsBS EN ISO 10644:2009National forewordThis British Standard is the UK implementation of EN ISO 10644:2009.It supersedes BS EN ISO 10644:1998 which is withdrawn.The UK part
3、icipation in its preparation was entrusted to TechnicalCommittee FME/9/3, Product standards for fasteners.A list of organizations represented on this committee can be obtained onrequest to its secretary.This publication does not purport to include all the necessary provisionsof a contract. Users are
4、 responsible for its correct application.Compliance with a British Standard cannot confer immunityfrom legal obligations.EUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN ISO 10644July 2009ICS 21.060.30 Supersedes EN ISO 10644:1998 English VersionScrew and washer assemblies made of steel with plain
5、washers- Washer hardness classes 200 HV and 300 HV (ISO10644:2009)Vis en acier rondelle plate incorpore - Rondelles declasses de duret 200 HV et 300 HV (ISO 10644:2009)Kombi-Schrauben aus Stahl mit flachen Scheiben -Hrteklassen der Scheiben 200 HV und 300 HV (ISO10644:2009)This European Standard was
6、 approved by CEN on 20 June 2009.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationa
7、lstandards may be obtained on application to the CEN 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 translationunder the responsibility of a CEN member into its own language and notifi
8、ed to the CEN Management Centre has the same status as theofficial versions.CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta,
9、Netherlands, Norway, Poland, Portugal,Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGManagement Centre: Avenue Marnix 17, B-1000 Brussels 2009 CEN All rights of exploitation
10、in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN ISO 10644:2009: EBS EN ISO 10644:2009EN ISO 10644:2009 (E) 3 Foreword This document (EN ISO 10644:2009) has been prepared by Technical Committee ISO/TC 2 “Fasteners“ in collaboration with Technical Committee CEN/TC 1
11、85 “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 January 2010, and conflicting national standards shall be withdrawn at the latest by January
12、 2010. 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 10644:1998. According to the CEN/CENELEC Intern
13、al Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malt
14、a, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. Endorsement notice The text of ISO 10644:2009 has been approved by CEN as a EN ISO 10644:2009 without any modification. BS EN ISO 10644:2009ISO 10644:2009(E) ISO 2009 All rights
15、reserved iiiForeword 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. Each member body interested in a subject f
16、or 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 International Electrotechnical Commission (IEC) on
17、 all matters of electrotechnical standardization. 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 a
18、re circulated to the member bodies for voting. 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
19、responsible for identifying any or all such patent rights. ISO 10644 was prepared by Technical Committee ISO/TC 2, Fasteners, Subcommittee SC 10, Product standards for fasteners. This second edition cancels and replaces the first edition (ISO 10644:1998), which has been technically revised. BS EN IS
20、O 10644:2009BS EN ISO 10644:2009INTERNATIONAL STANDARD ISO 10644:2009(E) ISO 2009 All rights reserved 1Screw and washer assemblies made of steel with plain washers Washer hardness classes 200 HV and 300 HV 1 Scope This International Standard specifies the requirements for metric screw and plain wash
21、er assemblies made of steel with coarse thread M2 to M12 inclusive, flat seating heads, property classes up to and including 10.9 and washer hardness classes 200 HV or 300 HV. The plain washers are captive, i.e. prevented from disassembly and free to rotate. NOTE The manufacturing of screw and washe
22、r assemblies takes into consideration material and production procedure of screw blank and washer as well as the assembly process of components, in order to meet specification requirements (see Annex A). 2 Normative references The following referenced documents are indispensable for the application
23、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 898-1, Mechanical properties of fasteners made of carbon steel and alloy steel Part 1: Bolts, screws and studs with sp
24、ecified property classes Coarse thread and fine pitch thread ISO 1207, Slotted cheese head screws Product grade A ISO 1580, Slotted pan head screws Product grade A ISO 4014, Hexagon head bolts Product grades A and B ISO 4015, Hexagon head bolts Product grade B Reduced shank (shank diameter approxima
25、tely equal to pitch diameter) ISO 4017, Hexagon head screws Product grades A and B ISO 4042, Fasteners Electroplated coatings ISO 4762, Hexagon socket head cap screws ISO 7045, Pan head screws with type H or type Z cross recess Product grade A ISO 9717, Phosphate conversion coatings for metals Metho
26、d of specifying requirements ISO 10673, Plain washers for screw and washer assemblies Small, normal and large series Product grade A ISO 10683, Fasteners Non-electrolytically applied zinc flake coatings ISO 14579, Hexalobular socket head cap screws BS EN ISO 10644:2009ISO 10644:2009(E) 2 ISO 2009 Al
27、l rights reservedISO 14583, Hexalobular socket pan head screws ISO 15071, Hexagon bolts with flange Small series Product grade A ISO 15072, Hexagon bolts with flange with metric fine pitch thread Small series Product grade A 3 Dimensions The dimensions of plain washers shall be in accordance with IS
28、O 10673. The dimensions of the assembled screws shall conform to those of loose parts, i.e. ISO 1207, ISO 1580, ISO 4014, ISO 4015, ISO 4017, ISO 4762, ISO 7045, ISO 14579, ISO 14583, ISO 15071, ISO 15072, with the following exceptions: Bolts and screws shall have a reduced shank of such diameter, d
29、s, that the washer with dimensions in accordance with ISO 10673 is free to rotate. NOTE ds pitch diameter. The maximum distance from the underside of the head to the commencement of full thread is increased by an amount necessary to accommodate the washer thickness for those products which are appro
30、ximately threaded to the washer. For examples of screw and washer assemblies, see Figures 1 and 2. Figure 1 Screw threaded up to the washer Figure 2 Screw with shank The transition diameter, da, as specified in the reference International Standards (see Table 3) shall be reduced by an amount equival
31、ent to the difference between the nominal diameter, d, and pitch diameter to create the transition diameter, da1(see Figure 3 and Table 1). The curvature under head, as specified in the ISO International Standards for loose parts, shall not be changed. BS EN ISO 10644:2009ISO 10644:2009(E) ISO 2009
32、All rights reserved 3Figure 3 Transition diameter, da1, and shank diameter, dsTable 1 Dimensions of transition diameter Dimensions in millimetres Dimensions of plain washerscSmall series Normal series Large series ThreadaType S Type N Type L (Nominal thread diameter) d abda1h d2h d2h d2max. max. nom
33、. max. nom. max. nom. max. M2 2,4 0,6 4,5 0,6 5 0,6 6 M2,5 2,8 0,6 5 0,6 6 0,6 8 M3 3,3 0,6 6 0,6 7 0,8 9 (M3,5) 3,7 0,8 7 0,8 8 0,8 11 M4 4,3 0,8 8 0,8 9 1 12 M5 5,2 1 9 1 10 1 15 M6 6,2 1,6 11 1,6 12 1,6 18 M8 8,4 1,6 15 1,6 16 2 24 M10 10,2 2 18 2 20 2,5 30 M12 2Pd12,6 2 20 2,5 24 3 37 aSizes in
34、parentheses should be avoided. bMaximum distance from the underside of the washer to the commencement of the first full thread with the washer in contact with the screw bearing face or underhead radius, when measured using a faced-off, i.e. unchamfered, ring gauge, see Figure 1. cDimensions extracte
35、d from ISO 10673 for information only. dP is the pitch of the thread. BS EN ISO 10644:2009ISO 10644:2009(E) 4 ISO 2009 All rights reserved In the case of hexagon head screws, the alternative underhead configuration with undercut (type U) may be used by agreement between the supplier and the purchase
36、r, see Figure 4 and Table 2. aSmooth transition. Figure 4 Alternative underhead configuration, type U Table 2 Type U dimensions Dimensions in millimetres Thread d M3 M4 M5 M6 M8 M10 M12 da2max. 3,6 4,7 5,7 6,8 9,2 11,2 13,7 r min. 0,1 0,2 0,2 0,25 0,4 0,4 0,6 max. 0,20 0,25 0,25 0,30 0,4 0,4 0,5 v m
37、in. 0,05 0,05 0,05 0,05 0,1 0,1 0,1 NOTE For other dimensions, see Table 1. 4 Specifications and reference International Standards The components of screw and washer assemblies shall satisfy the material and mechanical property requirements specified in the respective product International Standards
38、 in the finished condition. For referee purposes, in case of dispute, testing of the mechanical properties in accordance with ISO 898-1 shall be carried out with the washer component removed. The hardness classes of the washers used for screw and washer assemblies shall be as follows: property class
39、 of screw u 8.8: hardness class of washer 200 HV or 300 HV in accordance with ISO 10673; property class of screw 9.8 and 10.9: hardness class of washer 300 HV in accordance with ISO 10673. NOTE The washer hardness class of the finished products can be obtained with the production methods described i
40、n Annex A. 5 Screw and washer combinations The standardized combinations of screws and washers and the symbols to be used for the components are given in Table 3. Washers with minimum internal diameter, d1, assembled with screws with maximum transition diameter, da1, may cause interference between w
41、asher and underhead radius. In that case, contact traces at the underhead radius may appear and the torque/clamp load performance may be affected. BS EN ISO 10644:2009ISO 10644:2009(E) ISO 2009 All rights reserved 5In order to avoid interference and contact traces, the use of screws with head type U
42、 or chamfered washers is recommended. Table 3 Combinations of screws and washers Symbols Screw WasheraType S N L Reference International Standard Symbol Symbol S Symbol N Symbol L ISO 4017 S1 x x ISO 4014bS2 x x ISO 7045 S3 x x ISO 4762 S4 x x x ISO 1580 S5 x x ISO 1207 S6 x x x ISO 14579 S10 x x x
43、ISO 14583 S11 x x ISO 15071 S12 x x ISO 15072 S13 x x aIn accordance with ISO 10673. bBolts in accordance with ISO 4014 with reduced shank according to Clause 3 will be similar to bolts in accordance with ISO 4015. 6 Coatings Coatings shall be in accordance with ISO 4042 for electroplated coatings,
44、ISO 10683 for non-electroplated zinc flake coatings and ISO 9717 for phosphate conversion coatings. Agreement may be made between the manufacturer and the purchaser on other types of coatings. 7 Designation The designation of a screw and washer assembly shall consist of the following: the descriptio
45、n of the component; reference to this International Standard, i.e. ISO 10644; the characteristics of the screw component; the screw symbol indicating the type of screw (see Table 3); the washer symbol indicating the type of washer (see Table 3); the hardness class of the washer. BS EN ISO 10644:2009
46、ISO 10644:2009(E) 6 ISO 2009 All rights reservedEXAMPLE 1 A hexagon head screw and washer assembly consisting of a screw M6 30-8.8 in accordance with ISO 4017 (symbol S1) and a washer (hardness class 200HV), normal series, in accordance with ISO 10673 (symbol N), is designated as follows: Screw and
47、washer assembly ISO 10644-M6 30-8.8-S1-N 200 HV EXAMPLE 2 A hexagon head screw and washer assembly of a screw M6 30-8.8 in accordance with ISO 4017 (symbol S1) with undercut (type U) and a washer (hardness class 300HV), normal series, in accordance with ISO 10673 (symbol N), is designated as follows
48、: Screw and washer assembly ISO 10644-M6 30-8.8-U-S1-N 300 HV BS EN ISO 10644:2009ISO 10644:2009(E) ISO 2009 All rights reserved 7Annex A (informative) Methods for the production of screw and captive washer assemblies Unless otherwise agreed between the manufacturer and the purchaser, the manufactur
49、er delivers bolt and washer assemblies according to the manufacturing method of his choice. There are two different methods for the production of screw and captive washer assemblies: a) Method 1 utilizes the practice of assembling a screw blank with a washer and then thread rolling the assembly. Subsequent heat treating of the assembly completes the process. The material of both the screw blank and the washer have to be chosen so that all requir
