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1、A Reference number ISO 10644:1998(E) INTERNATIONAL STANDARD ISO 10644 First edition 1998-08-01 Screw and washer assemblies with plain washers Washer hardness classes 200 HV and 300 HV Vis rondelle plate incorpore Rondelles de classes de duret 200 HV et 300 HV Copyright International Organization for
2、 Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/24/2007 22:21:23 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 10644:1998(E) ISO 1998 All rights reserved. Unless otherwise specified, no part of
3、this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the publisher. International Organization for Standardization Case postale 56 CH-1211 Genve 20 Switzerland Internetisoiso.ch
4、Printed in Switzerland ii 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. Each member body interested
5、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 International Electrotechnical Comm
6、ission (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 bodies casting a vote. Internat
7、ional Standard ISO 10644 was prepared by Technical Committee ISO/TC 2, Fasteners. Annex A of this International Standard is for information only. Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Res
8、ale, 04/24/2007 22:21:23 MDTNo reproduction or networking permitted without license from IHS -,-,- INTERNATIONAL STANDARD ISOISO 10644:1998(E) 1 Screw and washer assemblies with plain washers Washer hardness classes 200 HV and 300 HV 1 Scope This International Standard specifies the requirements for
9、 metric screw and plain washer assemblies with coarse thread M2 to M12 inclusive, flat seating heads, property classes up to and including 10.9 and washer hardness classes 200 HV and 300 HV. The plain washers are captive, i. e. prevented from disassembly and free to rotate. 2 Normative references Th
10、e following standards contain provisions which, through reference in this text, constitute provisions of this International Standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this International Standard a
11、re encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. Members of IEC and ISO maintain registers of currently valid International Standards. ISO 898-1:1998, Mechanical properties of fasteners made of carbon steel and alloy steel Part 1: Bo
12、lts, screws and studs. ISO 1207:1992, Slotted cheese head screws Product grade A. ISO 1580:1994, Slotted pan head screws Product grade A. ISO 4014: 1), Hexagon head bolts Product grades A and B. ISO 4017: 2), Hexagon head screws Product grades A and B. ISO 4042: 3), Fasteners Electroplated coatings.
13、 ISO 4762:1997, Hexagon socket head cap screws. ISO 7045:1994, Pan head screws with type H or type Z cross recess Product grade A. ISO 10673:1998, Plain washers for screw and washer assemblies Small, normal and large series Product grade A. 1) To be published. (Revision of ISO 4014:1988) 2) To be pu
14、blished. (Revision of ISO 4017:1988) 3) To be published. (Revision of ISO 4042-1989) Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/24/2007 22:21:23 MDTNo reproduction or networking per
15、mitted without license from IHS -,-,- ISO 10644:1998(E) ISO 2 3 Dimensions The dimensions for the assembled screws shall conform to those in the ISO standards for loose parts with the following exceptions: Bolts and screws shall have a reduced shank of such diameter (ds) that the washer with dimensi
16、ons according to 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 approximately threaded to the washer. The
17、transition diameter da as specified in the reference standards (see table 3) shall be reduced by an amount equivalent to the difference between the nominal and pitch diameter to create the transition diameter da1 (see figure 1 and table 1). The curvature under head, as specified in the ISO standards
18、 for loose parts, shall not be changed. The dimensions for plain washers shall be in accordance with ISO 10673. Figure 1 Transition diameter da1 and shank diameter ds Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9
19、972545001 Not for Resale, 04/24/2007 22:21:23 MDTNo reproduction or networking permitted without license from IHS -,-,- ISOISO 10644:1998(E) 3 Table 1 Dimensions Dimensions in millimetres Dimensions of plain washers3) Thread1) Small series Type S Normal series Type N Large series Type L (d) a2) da1h
20、d2hd2hd2 max.max.nom.max.nom.max.nom.max. M22,40,64,50,650,66 M2,52,80,650,660,68 M33,30,660,670,89 (M3,5)3,70,870,880,811 M4 2P4) 4,30,880,89112 M55,219110115 M66,21,6111,6121,618 M88,41,6151,616224 M1010,22182202,530 M1212,62202,524337 1) Size in brackets should be avoided. 2) Maximum distance fro
21、m 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. 3) Dimensions extracted from ISO 10673 for information only. 4)P is the pitch of the
22、thread. Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/24/2007 22:21:23 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 10644:1998(E) ISO 4 For examples of
23、 screw and washer assemblies see figures 2 and 3. Figure 2 Screw threaded up to the washer Figure 3 Screw with shank In the case of hexagon head screws the alternative underhead configuration with undercut (type U) may be used by agreement between supplier and purchaser, see figure 4 and table 2. 1)
24、 Smooth transition Figure 4 Alternative underhead configuration, type U Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/24/2007 22:21:23 MDTNo reproduction or networking permitted withou
25、t license from IHS -,-,- ISOISO 10644:1998(E) 5 Table 2 Type U dimensions Dimensions in millimetres Thread (d)M3M4M5M6M8M10M12 da2max.3,64,75,76,89,211,213,7 rmin.0,10,20,20,250,40,40,6 v max.0,200,250,250,300,40,40,5 min.0,050,050,050,050,10,10,1 NOTE For other dimensions see table 1. 4 Specificati
26、ons and reference standards The components of screw and washer assemblies shall satisfy the material and mechanical property requirements specified in the respective product standards in the finished condition. The requirements for electroplating are covered in ISO 4042. For referee purposes, in cas
27、e of dispute, testing 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 of screw 8.8: hardness class of washer 200 HV according to ISO 10673; property class
28、 of screw 9.8 and 10.9: hardness class of washer 300 HV according to ISO 10673. 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. Copyright International Organization for Standardization Provided by
29、 IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/24/2007 22:21:23 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 10644:1998(E) ISO 6 Table 3 Combinations of screws and washers Symbols Screw Washer1) Type SNL Reference standa
30、rdSymbolSymbol SSymbol NSymbol L ISO 4017:S1 ISO 4014:2) S2 ISO 7045:1994S3 ISO 4762:1997S4 ISO 1580:1994S5 ISO 1207:1992S6 1) In accordance with ISO 10673 2) Bolts in accordance with ISO 4014 with reduced shank according to clause 3 will be similar to bolts in accordance with ISO 4015. 6 Designatio
31、n The designation of a screw and washer assembly shall consist of the description of the component, reference to this International Standard, the characteristics of the screw component, the screw symbol indicating the type of screw (see table 3), and the washer symbol indicating the type of washer (
32、see table 3). EXAMPLE 1 A hexagon head screw and washer assembly consisting of a screw M6 30 8.8 according to ISO 4017 (symbol S1) and a washer, normal series, according to ISO 10673 (symbol N) is designated as follows: Screw and washer assembly ISO 10644 M6 30 8.8 S1 N EXAMPLE 2 A hexagon head scre
33、w and washer assembly of a screw M6 30 8.8 according to ISO 4017 (symbol S1) with undercut (type U) and a washer, normal series, according to ISO 10673 (symbol N) is designated as follows: Screw and washer assembly ISO 10644 M6 30 8.8 U S1 N Copyright International Organization for Standardization P
34、rovided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/24/2007 22:21:23 MDTNo reproduction or networking permitted without license from IHS -,-,- ISOISO 10644:1998(E) 7 Annex A (informative) Bibliography 1 ISO 4015:1979, Hexagon head bolts Product gra
35、de B Reduced shank (shank diameter approximately equal to pitch diameter). Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/24/2007 22:21:23 MDTNo reproduction or networking permitted wit
36、hout license from IHS -,-,- ISO 10644:1998(E) ISO ICS 21.060.30 Descriptors: fasteners, washers, plain washers, specifications, dimensions, hardness, designation. Price based on 7 pages Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/24/2007 22:21:23 MDTNo reproduction or networking permitted without license from IHS -,-,-