1、BS ISO 725:2009 ICS 21.040.20 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW BRITISH STANDARD ISO inch screw threads Basic dimensionsThis British Standard was published under the authority of the Standards Policy and Strategy Committee on 30 June 2009. BSI 2009 ISBN 978 0 580
2、 64569 3 Amendments/corrigenda issued since publication Date Comments BS ISO 725:2009 National foreword This British Standard is the UK implementation of ISO 725:2009. The UK participation in its preparation was entrusted to Technical Committee FME/9, Fasteners. A list of organizations represented o
3、n this committee can be obtained on request to its secretary. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard cannot confer immunity from legal obligations.BS ISO 725:2009Re
4、ference number ISO 725:2009(E) ISO 2009INTERNATIONAL STANDARD ISO 725 Second edition 2009-04-15 ISO inch screw threads Basic dimensions Filetages ISO en inches Dimensions de base BS ISO 725:2009 ISO 725:2009(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobes li
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7、been taken to ensure that the file is suitable for use by ISO member bodies. In the unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below. COPYRIGHT PROTECTED DOCUMENT ISO 2009 All rights reserved. Unless otherwise specified, no part
8、of 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 either ISO at the address below or ISOs member body in the country of the requester. ISO copyright office Case postale 56
9、CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail copyrightiso.org Web www.iso.org Published in Switzerland ii ISO 2009 All rights reservedBS ISO 725:2009 ISO 725:2009(E) ISO 2009 All rights reserved iii Contents Page Foreword iv 1 Scope . 1 2 Symbols . 1 3 Basic dimensions . 2 B
10、ibliography . 14 BS ISO 725:2009 ISO 725:2009(E) iv ISO 2009 All rights reservedForeword 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
11、ISO technical committees. Each member body interested 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
12、 closely with the International Electrotechnical Commission (IEC) on 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.
13、 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. Attention is drawn to the possibility that some of the elements of this
14、document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 725 was prepared by Technical Committee ISO/TC 1, Screw threads. This second edition results from the reinstatement of ISO 725:1978, which was withdrawn in 2000 and with
15、 which it is technically identical. BS ISO 725:2009 INTERNATIONAL STANDARD ISO 725:2009(E) ISO 2009 All rights reserved 1 ISO inch screw threads Basic dimensions 1 Scope This International Standard specifies the basic dimensions, in inches, of ISO inch screw threads in accordance with ISO 263. The v
16、alues refer to the basic profile in accordance with ISO 68-2. 2 Symbols D basic major diameter of internal thread (nominal diameter) d basic major diameter of external thread (nominal diameter) D 2basic pitch diameter of internal thread d 2basic pitch diameter of external thread D 1basic minor diame
17、ter of internal thread d 1basic minor diameter of external thread H height of fundamental triangle n number of threads per inch (25,4 mm) BS ISO 725:2009 ISO 725:2009(E) 2 ISO 2009 All rights reserved3 Basic dimensions Dimensions shall be in accordance with Figure 1 and given in Table 1. The values
18、of D 2 , d 2 , D 1and d 1have been calculated from the following equations and rounded, in Table 1, to the fourth decimal place: 2 3 0,649 519 2 8 DD HD n = = 2 3 0,649 519 2 8 dd Hd n = = 1 5 1 ,082 532 2 8 DD HD n = = 1 5 1 ,082 532 2 8 dd Hd n = = where 0,866 025 40 H n = aPitch, P = 1/n. Figure
19、1 Basic dimensions BS ISO 725:2009 ISO 725:2009(E) ISO 2009 All rights reserved 3 Table 1 Basic dimensions Major diameter Number of threads per inch Thread series Pitch diameter Minor diameter D, d n D 2 , d 2D 1 , d 1Size in in in No. 0 0,060 0 80 UNF 0,051 9 0,046 5 64 UNC 0,062 9 0,056 1 No. 1 0,
20、073 0 72 UNF 0,064 0 0,058 0 56 UNC 0,074 4 0,066 7 No. 2 0,086 0 64 UNF 0,075 9 0,069 1 48 UNC 0,085 5 0,076 4 No. 3 0,099 0 56 UNF 0,087 4 0,079 7 40 UNC 0,095 8 0,084 9 No. 4 0,112 0 48 UNF 0,098 5 0,089 4 40 UNC 0,108 8 0,097 9 No. 5 0,125 0 44 UNF 0,110 2 0,100 4 32 UNC 0,117 7 0,104 2 No. 6 0,
21、138 0 40 UNF 0,121 8 0,110 9 32 UNC 0,143 7 0,130 2 No. 8 0,164 0 36 UNF 0,146 0 0,133 9 24 UNC 0,162 9 0,144 9 No. 10 0,190 0 32 UNF 0,169 7 0,156 2 24 UNC 0,188 9 0,170 9 28 UNF 0,192 8 0,177 3 No. 12 0,216 0 32 UNEF 0,195 7 0,182 2 20 UNC 0,217 5 0,195 9 28 UNF 0,226 8 0,211 3 1/4 0,250 0 32 UNEF
22、 0,229 7 0,216 2 18 UNC 0,276 4 0,252 4 20 UN 0,280 0 0,258 4 24 UNF 0,285 4 0,267 4 28 UN 0,289 3 0,273 8 5/16 0,312 5 32 UNEF 0,292 2 0,278 7 16 UNC 0,334 4 0,307 3 20 UN 0,342 5 0,320 9 24 UNF 0,347 9 0,329 9 28 UN 0,351 8 0,336 3 3/8 0,375 0 32 UNEF 0,354 7 0,341 2 BS ISO 725:2009 ISO 725:2009(E
23、) 4 ISO 2009 All rights reservedTable 1 (continued) Major diameter Number of threads per inch Thread series Pitch diameter Minor diameter D, d n D 2 , d 2D 1 , d 1Size in in in 14 UNC 0,391 1 0,360 2 16 UN 0,396 9 0,369 8 20 UNF 0,405 0 0,383 4 28 UNEF 0,414 3 0,398 8 7/16 0,437 5 32 UN 0,417 2 0,40
24、3 7 13 UNC 0,450 0 0,416 7 16 UN 0,459 4 0,432 3 20 UNF 0,467 5 0,445 9 28 UNEF 0,476 8 0,461 3 1/2 0,500 0 32 UN 0,479 7 0,466 2 12 UNC 0,508 4 0,472 3 16 UN 0,521 9 0,494 8 18 UNF 0,526 4 0,502 4 20 UN 0,530 0 0,508 4 24 UNEF 0,535 4 0,517 4 28 UN 0,539 3 0,523 8 9/16 0,562 5 32 UN 0,542 2 0,528 7
25、 11 UNC 0,566 0 0,526 6 12 UN 0,570 9 0,534 8 16 UN 0,584 4 0,557 3 18 UNF 0,588 9 0,564 9 20 UN 0,592 5 0,570 9 24 UNEF 0,597 9 0,579 9 28 UN 0,601 8 0,586 3 5/8 0,625 0 32 UN 0,604 7 0,591 2 12 UN 0,633 4 0,597 3 16 UN 0,646 9 0,619 8 20 UN 0,655 0 0,633 4 24 UNEF 0,660 4 0,642 4 28 UN 0,664 3 0,6
26、48 8 11/16 0,687 5 32 UN 0,667 2 0,653 7 BS ISO 725:2009 ISO 725:2009(E) ISO 2009 All rights reserved 5 Table 1 (continued) Major diameter Number of threads per inch Thread series Pitch diameter Minor diameter D, d n D 2 , d 2D 1 , d 1Size in in in 10 UNC 0,685 0 0,641 7 12 UN 0,695 9 0,659 8 16 UNF
27、 0,709 4 0,682 3 20 UNEF 0,717 5 0,695 9 28 UN 0,726 8 0,711 3 3/4 0,750 0 32 UN 0,729 7 0,716 2 12 UN 0,758 4 0,722 3 16 UN 0,771 9 0,744 8 20 UNEF 0,780 0 0,758 4 28 UN 0,789 3 0,773 8 13/16 0,812 5 32 UN 0,792 2 0,778 7 9 UNC 0,802 8 0,754 7 12 UN 0,820 9 0,784 8 14 UNF 0,828 6 0,797 7 16 UN 0,83
28、4 4 0,807 3 20 UNEF 0,842 5 0,820 9 28 UN 0,851 8 0,836 3 7/8 0,875 0 32 UN 0,854 7 0,841 2 12 UN 0,883 4 0,847 3 16 UN 0,896 9 0,869 8 20 UNEF 0,905 0 0,883 4 28 UN 0,914 3 0,898 8 15/16 0,937 5 32 UN 0,917 2 0,903 7 8 UNC 0,918 8 0,864 7 12 UNF 0,945 9 0,909 8 16 UN 0,959 4 0,932 3 20 UNEF 0,967 5
29、 0,945 9 28 UN 0,976 8 0,961 3 1 1,000 0 32 UN 0,979 7 0,966 2 8 UN 0,981 3 0,927 2 12 UN 1,008 4 0,972 3 16 UN 1,021 9 0,994 8 18 UNEF 1,026 4 1,002 4 20 UN 1,030 0 1,008 4 1 1/16 1,062 5 28 UN 1,039 3 1,023 8 BS ISO 725:2009 ISO 725:2009(E) 6 ISO 2009 All rights reservedTable 1 (continued) Major d
30、iameter Number of threads per inch Thread series Pitch diameter Minor diameter D, d n D 2 , d 2D 1 , d 1Size in in in 7 UNC 1,032 2 0,970 4 8 UN 1,043 8 0,989 7 12 UNF 1,070 9 1,034 8 16 UN 1,084 4 1,057 3 18 UNEF 1,088 9 1,064 9 20 UN 1,092 5 1,070 9 1 1/8 1,125 0 28 UN 1,101 8 1,086 3 8 UN 1,106 3
31、 1,052 2 12 UN 1,133 4 1,097 3 16 UN 1,146 9 1,119 8 18 UNEF 1,151 4 1,127 4 20 UN 1,155 0 1,133 4 1 3/16 1,187 5 28 UN 1,164 3 1,148 8 7 UNC 1,157 2 1,095 4 8 UN 1,168 8 1,114 7 12 UNF 1,195 9 1,159 8 16 UN 1,209 4 1,182 3 18 UNEF 1,213 9 1,189 9 20 UN 1,217 5 1,195 9 1 1/4 1,250 0 28 UN 1,226 8 1,
32、211 3 8 UN 1,231 3 1,177 2 12 UN 1,258 4 1,222 3 16 UN 1,271 9 1,244 8 18 UNEF 1,276 4 1,252 4 20 UN 1,280 0 1,258 4 1 5/16 1,312 5 28 UN 1,289 3 1,273 8 6 UNC 1,266 7 1,194 6 8 UN 1,293 8 1,239 7 12 UNF 1,320 9 1,284 8 16 UN 1,334 4 1,307 3 18 UNEF 1,338 9 1,314 9 20 UN 1,342 5 1,320 9 1 3/8 1,375
33、0 28 UN 1,351 8 1,336 3 BS ISO 725:2009 ISO 725:2009(E) ISO 2009 All rights reserved 7 Table 1 (continued) Major diameter Number of threads per inch Thread series Pitch diameter Minor diameter D, d n D 2 , d 2D 1 , d 1Size in in in 6 UN 1,329 2 1,257 1 8 UN 1,356 3 1,302 2 12 UN 1,383 4 1,347 3 16 U
34、N 1,396 9 1,369 8 18 UNEF 1,401 4 1,377 4 20 UN 1,405 0 1,383 4 1 7/16 1,437 5 28 UN 1,414 3 1,398 8 6 UNC 1,391 7 1,319 6 8 UN 1,418 8 1,364 7 12 UNF 1,445 9 1,409 8 16 UN 1,459 4 1,432 3 18 UNEF 1,463 9 1,439 9 20 UN 1,467 5 1,445 9 1 1/2 1,500 0 28 UN 1,476 8 1,461 3 6 UN 1,454 2 1,382 1 8 UN 1,4
35、81 3 1,427 2 12 UN 1,508 4 1,472 3 16 UN 1,521 9 1,494 8 18 UNEF 1,526 4 1,502 4 1 9/16 1,562 5 20 UN 1,530 0 1,508 4 6 UN 1,516 7 1,444 6 8 UN 1,543 8 1,489 7 12 UN 1,570 9 1,534 8 16 UN 1,584 4 1,557 3 18 UNEF 1,588 9 1,564 9 1 5/8 1,625 0 20 UN 1,592 5 1,570 9 6 UN 1,579 2 1,507 1 8 UN 1,606 3 1,
36、552 2 12 UN 1,633 4 1,597 3 16 UN 1,646 9 1,619 8 18 UNEF 1,651 4 1,627 4 1 11/16 1,687 5 20 UN 1,655 0 1,633 4 BS ISO 725:2009 ISO 725:2009(E) 8 ISO 2009 All rights reservedTable 1 (continued) Major diameter Number of threads per inch Thread series Pitch diameter Minor diameter D, d n D 2 , d 2D 1
37、, d 1Size in in in 5 UNC 1,620 1 1,533 56 UN 1,641 7 1,569 6 8 UN 1,668 8 1,614 7 12 UN 1,695 9 1,659 8 16 UN 1,709 4 1,682 3 1 3/4 1,750 0 20 UN 1,717 5 1,695 9 6 UN 1,704 2 1,632 1 8 UN 1,731 3 1,677 2 12 UN 1,758 4 1,722 3 16 UN 1,771 9 1,744 8 1 13/16 1,812 5 20 UN 1,780 0 1,758 4 6 UN 1,766 7 1
38、,694 6 8 UN 1,793 8 1,739 7 12 UN 1,820 9 1,784 8 16 UN 1,834 4 1,807 3 1 7/8 1,875 0 20 UN 1,842 5 1,820 9 6 UN 1,829 2 1,757 1 8 UN 1,856 3 1,802 2 12 UN 1,883 4 1,847 3 16 UN 1,896 9 1,869 8 1 15/16 1,937 5 20 UN 1,905 0 1,883 4 4 1/2 UNC 1,855 7 1,759 4 6 UN 1,891 7 1,819 6 8 UN 1,918 8 1,864 7
39、12 UN 1,945 9 1,909 8 16 UN 1,959 4 1,932 3 2 2,000 0 20 UN 1,967 5 1,945 9 6 UN 2,016 7 1,944 6 8 UN 2,043 8 1,989 7 12 UN 2,070 9 2,034 8 16 UN 2,084 4 2,057 3 2 1/8 2,125 0 20 UN 2,092 5 2,070 9 BS ISO 725:2009 ISO 725:2009(E) ISO 2009 All rights reserved 9 Table 1 (continued) Major diameter Numb
40、er of threads per inch Thread series Pitch diameter Minor diameter D, d n D 2 , d 2D 1 , d 1Size in in in 4 1/2 UNC 2,105 7 2,0094 6 UN 2,141 7 2,0696 8 UN 2,168 8 2,1147 12 UN 2,195 9 2,1598 16 UN 2,209 4 2,1823 2 1/4 2,250 0 20 UN 2,217 5 2,1959 6 UN 2,266 7 2,1946 8 UN 2,293 8 2,2397 12 UN 2,320
41、9 2,2848 16 UN 2,334 4 2,3073 2 3/8 2,375 0 20 UN 2,342 5 2,3209 4 UNC 2,337 6 2,229 4 6 UN 2,391 7 2,319 6 8 UN 2,418 8 2,364 7 12 UN 2,445 9 2,409 8 16 UN 2,459 4 2,432 3 2 1/2 2,500 0 20 UN 2,467 5 2,445 9 4 UN 2,462 6 2,354 4 6 UN 2,516 7 2,444 6 8 UN 2,543 8 2,489 7 12 UN 2,570 9 2,534 8 16 UN
42、2,584 4 2,557 3 2 5/8 2,625 0 20 UN 2,592 5 2,570 9 4 UNC 2,587 6 2,479 4 6 UN 2,641 7 2,569 6 8 UN 2,668 8 2,614 7 12 UN 2,695 9 2,659 8 16 UN 2,709 4 2,682 3 2 3/4 2,750 0 20 UN 2,717 5 2,695 9 4 UN 2,712 6 2,604 4 6 UN 2,766 7 2,694 6 8 UN 2,793 8 2,739 7 12 UN 2,820 9 2,784 8 16 UN 2,834 4 2,807
43、 3 2 7/8 2,875 0 20 UN 2,842 5 2,820 9 BS ISO 725:2009 ISO 725:2009(E) 10 ISO 2009 All rights reservedTable 1 (continued) Major diameter Number of threads per inch Thread series Pitch diameter Minor diameter D, d n D 2 , d 2D 1 , d 1Size in in in 4 UNC 2,837 6 2,729 4 6 UN 2,891 7 2,819 6 8 UN 2,918
44、 8 2,864 7 12 UN 2,945 9 2,909 8 16 UN 2,959 4 2,932 3 3 3,000 0 20 UN 2,967 5 2,945 9 4 UN 2,962 6 2,854 4 6 UN 3,016 7 2,944 6 8 UN 3,043 8 2,989 7 12 UN 3,070 9 3,034 8 3 1/8 3,125 0 16 UN 3,084 4 3,057 3 4 UNC 3,087 6 2,979 4 6 UN 3,141 7 3,069 6 8 UN 3,168 8 3,114 7 12 UN 3,195 9 3,159 8 3 1/4
45、3,250 0 16 UN 3,209 4 3,182 3 4 UN 3,212 6 3,104 4 6 UN 3,266 7 3,194 6 8 UN 3,293 8 3,239 7 12 UN 3,320 9 3,284 8 3 3/8 3,375 0 16 UN 3,334 4 3,307 3 4 UNC 3,337 6 3,229 4 6 UN 3,391 7 3,319 6 8 UN 3,418 8 3,364 7 12 UN 3,445 9 3,409 8 3 1/2 3,500 0 16 UN 3,459 4 3,432 3 4 UN 3,462 6 3,354 4 6 UN 3
46、,516 7 3,444 6 8 UN 3,543 8 3,489 7 12 UN 3,570 9 3,534 8 3 5/8 3,625 0 16 UN 3,584 4 3,557 3 4 UNC 3,587 6 3,479 4 6 UN 3,641 7 3,569 6 8 UN 3,668 8 3,614 7 12 UN 3,695 9 3,659 8 3 3/4 3,750 0 16 UN 3,709 4 3,682 3 BS ISO 725:2009 ISO 725:2009(E) ISO 2009 All rights reserved 11 Table 1 (continued)
47、Major diameter Number of threads per inch Thread series Pitch diameter Minor diameter D, d n D 2 , d 2D 1 , d 1Size in in in 4 UN 3,712 6 3,604 4 6 UN 3,766 7 3,694 6 8 UN 3,793 8 3,739 7 12 UN 3,820 9 3,784 8 3 7/8 3,875 0 16 UN 3,834 4 3,807 3 4 UNC 3,837 6 3,729 4 6 UN 3,891 7 3,819 6 8 UN 3,918
48、8 3,864 7 12 UN 3,945 9 3,909 8 4 4,000 0 16 UN 3,959 4 3,932 3 4 UN 3,962 6 3,854 4 6 UN 4,016 7 3,944 6 8 UN 4,043 8 3,989 7 12 UN 4,070 9 4,034 8 4 1/8 4,125 0 16 UN 4,084 4 4,057 3 4 UN 4,087 6 3,979 4 6 UN 4,141 7 4,069 6 8 UN 4,168 8 4,114 7 12 UN 4,195 9 4,159 8 4 1/4 4,250 0 16 UN 4,209 4 4,
49、182 3 4 UN 4,212 6 4,104 4 6 UN 4,266 7 4,194 6 8 UN 4,293 8 4,239 7 12 UN 4,320 9 4,284 8 4 3/8 4,375 0 16 UN 4,334 4 4,307 3 4 UN 4,337 6 4,229 4 6 UN 4,391 7 4,319 6 8 UN 4,418 8 4,364 7 12 UN 4,445 9 4,409 8 4 1/2 4,500 0 16 UN 4,459 4 4,432 3 4 UN 4,462 6 4,354 4 6 UN 4,516 7 4,444 6 8 UN 4,543 8 4,489 7 12 UN 4,570 9 4,534 8 4 5/8 4,625 0 16 UN 4,584 4 4,557 3 BS ISO 725:2009 ISO 725:2009(E) 12 ISO 2009 All rights reservedTable 1 (continued) Major diameter Number of threads per inch Thread seri
