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1、JIS JAPANESE INDUSTRIAL STANDARD Translated and Published by Japanese Standards Association (IS0 7721-2 : 1990) (Reaffirmed in 1999) Countersunk flat head screws- Part 2 : Penetration depth of cross recesses . ICs 21.040.01 Descriptors : countersunk fasteners, screws (bolts), depth, penetration test
2、s, recessed- head fasteners Reference number : JIS B 1014 : 1994 (E) 4 s Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/10/2007 19:16:38 MSTNo reproduction or networking permitted without license
3、from IHS -,-,- B 1014 : 1994 (IS0 7721-2 : 1990) Foreword This translation has been made based on the original Japanese Industrial Standard established by the Minister of International Trade and Industry through deliberations at Japanese Industrial Standards Committee in accordance with the Industri
4、al Standardization Law: Date of Establishment: 1994-02-01 Date of Reaffirmation: 1999-02-20 Date of Public Notice in Official Gazette: 1999-02-22 Investigated by: Japanese Industrial Standards Committee Divisional Council on Machine Elements JIS B 1014 : 1994, First English edition published in 2000
5、-08 Translated and published by: Japanese Standards Association 4-1-24, Akasaka, Minato-ku, Tokyo, 107-8440 JAPAN In the event of any doubts arising as to the contents, the original JIS is to be the final authority. . b . O JSA2000 All rights reserved. Unless otherwise specified, no part of this pub
6、lication 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. Printed in Japan Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees
7、/1111111001, User=Wing, Bernie Not for Resale, 03/10/2007 19:16:38 MSTNo reproduction or networking permitted without license from IHS -,-,- JAPANESE INDUSTRIAL STANDARD JIS B 1014: 1994 (IS0 7721-2 : 1990) Countersunk flat head screws- Part 2 : Penetration depth ofcross recesses Foreword for Japane
8、se Industrial Standard This Japanese Industrial Standard has been prepared based on IS0 7721-2 Countersunk flat head screws-Part 2 : Penetration depth of cross recesses issued in 1990 as the first edition without changing the technical contents. The “Informative references” underlined with dots in t
9、his Standard show the matters not specified in the original International Standard. Introduction The penetration depth of cross recesses for countersunk flat head screws has to satisfy two requirements which act in opposite directions for a given head dimension. First, there is the requirement for s
10、ufficient head strength to attain the proof and breaking loads of the respective property class. A shallow cross recess increases the head strength. On the other hand, the wrenchability of the screw should be sat- isfactory; this can only be achieved by a sufficiently deep cross recess. This Standar
11、d was developed in order to find a compromise which, as far as pos- sible, would meet both requirements. This Standard specifies deep cross recesses for countersunk head screws of low strength: a good wrenchability is achieved and the head strength is still sufficient. This execution will be used in
12、 IS0 7046-1 (see Annex A). For screws of higher strength, sufficient head strength can only be attained by a shallower penetration depth of the cross recesses. If such screws also require good wrenchability, then, under the conditions of the common head style, a shoulder has to be provided under the
13、 head, in addition to the larger penetration depth, in order to guarantee sufficient head strength. This compromise, which unfortunately results in different but interchangeable types of cross recessed flat countersunk head screws, is at the moment the only way of reaching an agreement at the intern
14、ational level. 1 Scope This Standard specifies the penetration depth of cross recesses of coun- tersunk flat head screws for the two series 1 and 2 (deep and shallow, respectively). 2 Normative references The following standards contain provisions which, through reference in this text, constitute pr
15、ovisions of this Standard. At the time of publica- tion, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this Standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. Mem
16、bers of IEC and IS0 maintain registers of currently valid International Standards. IS0 225 : 1983 Fasteners-Bolts, screws, studs and nuts-Symbols and designa- tions of dimensions I Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=
17、Wing, Bernie Not for Resale, 03/10/2007 19:16:38 MSTNo reproduction or networking permitted without license from IHS -,-,- STDmJIS 8 LO24-ENGL 2994 4933b08 05b488b 77T 2 B 1014 : 1994 (IS0 7721-2 1990) IS0 4757 : 1983 Cross recesses for screws IS0 7721 : 1983 Countersunk head screws-Head configurati
18、on and gauging Informative reference : JIS B 1013 Countersunk head screws-Head configura- tion and gauging is identical with the said International Standard. -. .- _-_._-_-_.-_- _._- _ _._._._._.-.-.-.-.-.- -._-._. 3 Dimensions For application of the penetration depths of cross recesses speci- fied
19、in Table 1, different underhead configurations are provided in order to attain sufficient head strength (see Fig. 1 and Fig. 2 ) . Both types satisfy the conditions of the common head style as specified in JIS B 1013 IS0 7721(1). Note (1) Will be revised and published under number IS0 7721-1. Remark
20、s : Informative reference : Symbols and designations of dimensions are specified in IS0 225. The provisions of IS0 225 are equivalent to that of JIS B 0143 Symbols and designations of dimensions for . _.-_._-.-.- _._._ ._._._._ .-_.-_ _-._._-._-._-_-.- ._-_ threaded-astene-rs a - = 2 . 5 P U - = W F
21、ig. 1 Screw with Fig. 2 Screw without underhead shoulder underhead shoulder Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/10/2007 19:16:38 MSTNo reproduction or networking permitted without licen
22、se from IHS -,-,- Series 1 (deep) Type H 5 P e z Series : Type H Penetration deDth(*) m Penetration Penetration deDth (9 m deDth*) m nin. max. (ref.) 3 . 6 0.9 1.6 min. mas. (ref.) 0.70 0.95 1.6 3 B 1014 : 1994 (IS0 7721-2 : 1990) Dimensions in millimetres Table 1 Dimensions Thread (d) Cross recesse
23、s I shallow) Typez Penetration depth (2) . - . I l I I l I I + ST2.2 D . 9 1 1.2 I 1.9 10.95 1 1.20 I 1.9 1 0.95 1 1.20 I 1.9 0.9 1 1.2 I 1.9 I 0.95 I 1.20 I 2.0 -1-1 - -1-1 - M2.5 I - 1 1.4 I 1.8 1 2.9 1 1.48 I 1.73 1 2.8 1.25 1 1.55 I 2.7 M3 I ST2.9 2 - 3 - 4 2.1 2.6 4.6 2.3 2.8 4.8 - - - 3.3 3.9
24、4.4 8.7 ST4.2 ST4.8 CT5.5 ST6.3 ST8 - 2.73 ri.18 1 6.3 3.87 I 4.32 I 8.5 M10 I ST9.5 4.8 I 5.3 I 9.6 4.78 1 5.23 1 9.4 Application (3) Screws without underhead shoulder Screws of property class 8.8 1 Screws without underhead shoulder Self-tapping screws W o o d screws Screws of property class 4.8 Sc
25、rews with underhead shoulder Screws of property classes 8.8 and 9.8 Thread cutting screws Thread forming screws accordance with IS0 4757. entirely head treated Thread forming screws Thread cutting screws N o t e s (1) Crossrecesse Informative reference : (2) Penetration depth measured in accordance
26、with IS0 4757. (3) S p e c i f i e d for steel screws, application for other materials at manufacturers option. The provisions of IS0 4757 are equivalent to that on type H and type Z of JIS B 1012 . c!% -?%?ses for. screws: Informative reference : . For the dimensional symbol of the penetration dept
27、h of cross recesses, “q” is used in JIS B 1012, JIS B 1111 Cross re- . cessed head screws and others. Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/10/2007 19:16:38 MSTNo reproduction or networki
28、ng permitted without license from IHS -,-,- 4. B 1014 : 1994 (IS0 7721-2 : 1990) Annex A (informative) Bibliography (1) IS0 7046 : 1983 Cross recessed countersunk flat head screws (common head The provisions of IS0 7046 are equivalent to that on the property class 4.8 of the countersunk head screws
29、in the text of JIS B 1111. Note (2) The said standard has been revised and published under number IS0 7046-1 in 1994. style)-Product grade A and property class 4.8 only(2) Informative reference : _.-.-.-. ._-_-._._-._._-. _._-.-.- ._._._- , Copyright Japanese Standards Association Provided by IHS un
30、der license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/10/2007 19:16:38 MSTNo reproduction or networking permitted without license from IHS -,-,- - STD-JIS B LOLLi-ENGL 1994 W 4933b08 0564889 489 = Errata for JIS (English edition) are printed in Standardization J
31、ournal, published monthly by the Japanese Standards Association, and also provided to subscribers of JS (English edition) in Monthly Information. Errata will be provided upon request, please contact: Standardization Promotion Department, Japanese Standards Association 4-1-24, Akasaka, Minato-ku, Tokyo, 107-8440 JAPAN TEL. 03-3583-8002 FAX. 03-3583-0462 Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/10/2007 19:16:38 MSTNo reproduction or networking permitted without license from IHS -,-,-