JIS-B-0208-1973-R2005-ENG.pdf
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1、.- J I S B*0208 73 4933608 0007584 I m UDC 621.882.082.3 - JAPANESE INDUSTRIAL STANDARD Unified Fine Screw Threads Translated and Published by Japanese Standards Association 3 s J I S 8*0208 73 m 4933608 0007585 3 m - Translation without Guarantee In the event of any doubt arising, the original stan
2、dards in Japanese are to be evidence B 0208-1973 Japanese Text Established by Minister of International Trade and Industry Date of Establishment: August 21, 1953 Date of Revision: Date of Public Notice in Official Gazette: Investigated by: December 1, 1973 December 7, 1973 Japanese Industrial standa
3、rds Committee Technical Comittee on Screw Threads (Basic) (Chairman: YAMAMOTO Noboru) Divisional Council on Machine Element (Chairman: HAYASHI Kineo) This English translation is published by: Japanese Standards Association 1-24, Akasaka 4, Minato-ku, Tokyo, 107 Japan 1974 0 - _ - J I S B*O208 73 E 4
4、933608 0007586 5 E JAPANESE INDUSTRIAL STANDARD Unified Fine Screw Threads UDC 621 .882.082.3 J I S B 0208-1973 I . Scope This Japanese Industrial Standard specifies the basic profile, formulas and basic dimensions for unified fine screw threads used for aircrafts and other purposes of limited neces
5、sity. Reference: These unified fine screw threads conform to IS0 inch fine series screw threads specified in IS0 263 (IS0 inch screw threads. General plan and selection for screws, bolts and nuts-Diameter range O .O6 to 6 in). Basic Profile, Formulas and Basic Dimensions 2. 2. I Figure: Basic Profil
6、e The basic profile is indicated by a heavy line in the following Fig. Basic Profile for Unified Fine Screw Threads Reference: This basic profile conforms to the basic profile of IS0 general purpose screw threads specified in IS0 68 (IS0 general purpose screw threads- Basic profile), 2.2 Formulas Th
7、e formulas used for the calculation of basic dimensions shall be as follows: O. 866025 25. H= d =(d) 2 5 . 4 D=d O. 541266 x25. 25.4 p = - n n Hi= Dz=dz n di=(d- ) x25. Di=di 1.082532 where, n: number of threads per 25.4 mm Remark: The values in parentheses are those of inch unit rounded off to 0.00
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