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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
8、01 inch. Reference Standards: IS0 68-1 973 IS0 general purpose screw threads-Basic profile IS0 263-1 973 IS0 inch screw threads. General plan and selection for screws, bolts and nuts-Diameter range 0.06 to 6 in . -,-,- JIS B*O208 73 4733608 0007587 7 W 2. B 0208-1973 2.3 Basic Dimensions The basic d
9、imensions shall conform to the following Table: Table, Basic Dimensions for Unified Fine Screw Threads Unit : mm Designation of screw thread* Co. o hreat !5.41 per n - 80 72 64 Pitct P ,Ref. - O. 3175 O. 3528 O. 3969 Depth o thread engage- ment Hi - O. 172 O. 191 O. 215 Internal thead iajor iameler
10、D I dimeier 2 diameter DI Pilch D I U h r External thread (Reference) 1 2 ilch liameler d No.“O-80 UNF NO. 2-64 UNF O. 0600-80 UNF O. 0730-72 UNF O. 0860-64 U h F 1.524 1.854 2.184 1.318 1.626 1.9% 1.181 1.473 1.755 NO. 1-72 UNF NO. 3-56 UNF O. 0990-56 UNF O. 112048 UNF 0. 125014 UNF 56 48 44 O. 453
11、6 O. 5292 o. 5773 O. 246 O. 286 O. 312 2.220 2.502 2.799 2.024 2.271 2.550 2.515 2.845 3.175 3.505 4.166 4.826 No. 448UNF NO. 5-44UNF NO. 6-40 UNF NO. 8-36 UNF NO. 10-32 UNF O. 138040 UNF O. 1640-36 UNF O. 1900-32 UNF 40 36 32 O. 6350 O. 7056 O. 7938 O. 344 O. 382 O. 430 3.094 3.708 1.310 2.817 3.40
12、1 3.967 - No. 12-28 UNP _._ _. 28 28 2.6 _ 24 20 20 _ 18 18 16 O. 9071 O. 9071 1.0583 O. ,491 O. 491 o. 573 O. 2160-28 UNF O. 2500-28 UNP O. 3125-24 UNF _ 0. 3750-24 UNF O. 4375-20 CNF O. 5000-20 UNF O. 5625-18 UNF O. 6250-18 UNF O. 7500- 16 UNF 5.486 6.350 7.938 9.525 11.112 12.700 14.288 15.875 19
13、.050 4.897 5.761 7.249 8.837 10.287 11.874 4.503 5.367 6.792 8.379 9.738 11.326 12.761 14. 348 17.330 3/8 -24 UNF 7/16-20 UNF 1/2 -20 UNF 1.0583 1.2700 1.2700 1.4111 1.4111 1.5875 _ 1.8143 2.1167 2.1167 o. 573 O. 687 O. 687 O. 764 0. 764 0. 839 9/16-18 UNP 518 -18 UNP 3/4 -16 UNF 13.371 14.958 18.01
14、9 7 k - 1 4 UNF 1 -12 UNF ll/s -12 UNF O. 8730 -14 UNF 1.0000-12 UNF 1.1250-12 UNF 14 12 12 U. 982 1.146 1.146 22.225 25.400 28.575 21.046 24.026 27.201 20.262 23.109 26.284 11/ -12 UNF 13/8 -12 UNF 1/2 -12 UNF 1.2500-12 UNF 1.3750-12 UNF 1.5000-12 UNF 12 12 12 2.1167 2.1167 2.1167 1.146 1.146 1.146 31.750 34.925 38.100 30.376 33.551 36.726 29.459 32.634 35.809 Note* Screw threads in column I shall preferentially be chosen and, if necessary, in column 2. expressed by the decimal notation. Designations in reference column are those -,-,-