1、BS ISO 725:2009ICS 21.040.20NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBRITISH STANDARDISO inch screw threads Basic dimensionsThis British Standardwas published under theauthority of the StandardsPolicy and StrategyCommittee on 30 June2009. BSI 2009ISBN 978 0 580 64569 3Am
2、endments/corrigenda issued since publicationDate CommentsBS ISO 725:2009National forewordThis British Standard is the UK implementation of ISO 725:2009.The UK participation in its preparation was entrusted to TechnicalCommittee FME/9, Fasteners.A list of organizations represented on this committee c
3、an be obtained onrequest to its secretary.This publication does not purport to include all the necessary provisionsof a contract. Users are responsible for its correct application.Compliance with a British Standard cannot confer immunityfrom legal obligations.BS ISO 725:2009Reference numberISO 725:2
4、009(E)ISO 2009INTERNATIONAL STANDARD ISO725Second edition2009-04-15ISO inch screw threads Basic dimensions Filetages ISO en inches Dimensions de base BS ISO 725:2009ISO 725:2009(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobes licensing policy, this file may
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9、 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 725:2009ISO 725:2009(E) ISO 2009 All rights reserved iiiContents Page Foreword iv 1 Scope . 1 2 Symbols . 1 3 Basic dimensions . 2 Bibliography . 14 BS ISO 725:2009
10、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 ISO technical committees. Each me
11、mber 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 closely with the International E
12、lectrotechnical 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. Draft International Standards ad
13、opted 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 document may be the subject of pa
14、tent 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 which it is technically identica
15、l. BS ISO 725:2009INTERNATIONAL STANDARD ISO 725:2009(E) ISO 2009 All rights reserved 1ISO 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 values refer to the basic profile in
16、 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) D2basic pitch diameter of internal thread d2basic pitch diameter of external thread D1basic minor diameter of internal thread d1basic minor d
17、iameter of external thread H height of fundamental triangle n number of threads per inch (25,4 mm) BS ISO 725:2009ISO 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 of D2, d2, D1and d1have been calculated
18、from the following equations and rounded, in Table 1, to the fourth decimal place: 23 0,649 51928DD HDn= = 23 0,649 51928dd Hdn= = 15 1,082 53228DD HDn= = 15 1,082 53228dd Hdn= = where 0,866 025 40H n= aPitch, P = 1/n. Figure 1 Basic dimensions BS ISO 725:2009ISO 725:2009(E) ISO 2009 All rights rese
19、rved 3Table 1 Basic dimensions Major diameter Number of threads per inch Thread series Pitch diameter Minor diameter D, d n D2, d2D1, d1Size 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 0,073 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
20、,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 0,138 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
21、,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 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
22、 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 725:2009ISO 725:2009(E) 4 ISO 2009 All rights reservedTable 1 (continued) Major diameter Number of thread
23、s per inch Thread series Pitch diameter Minor diameter D, d n D2, d2D1, d1Size 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 0,403 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
24、,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 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
25、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 0,648 8 11/16 0,687 5 32 UN 0,667 2 0,653 7 BS ISO 725:2009ISO 725:2009(E) ISO 2009 All righ
26、ts reserved 5Table 1 (continued) Major diameter Number of threads per inch Thread series Pitch diameter Minor diameter D, d n D2, d2D1, d1Size in in in 10 UNC 0,685 0 0,641 7 12 UN 0,695 9 0,659 8 16 UNF 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
27、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 0,834 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
28、 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 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
29、 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 725:2009ISO 725:2009(E) 6 ISO 2009 All rights reservedTable 1 (continued) Major diameter Number of threads per inch Thread series Pitch diameter Minor diameter D, d n D2, d2D1, d1
30、Size 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 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 3/1
31、6 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 1,211 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 1,2
32、80 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 0 28 UN 1,351 8 1,336 3 BS ISO 725:2009ISO 725:2009(E) ISO 2009 All rights reserved 7Table 1 (continued)
33、 Major diameter Number of threads per inch Thread series Pitch diameter Minor diameter D, d n D2, d2D1, d1Size 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 UN 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
34、 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 1,481 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,
35、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 1,552 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
36、BS ISO 725:2009ISO 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 D2, d2D1, d1Size 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
37、,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 1,694 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
38、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 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 1
39、2 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 725:2009ISO 725:2009(E) ISO 2009 All rights reserved 9Table 1 (continued) Major diameter Number of threads per inch Thread series Pitch diameter Minor diameter D, d n D2, d2D1, d1Size in in in 4 1/2 UNC 2,105 7 2,0
40、094 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 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
41、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 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
42、 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 3 2 7/8 2,875 0 20 UN 2,842 5 2,820 9 BS ISO 725:2009ISO 725:2009(E) 10 ISO 2009 All rights reservedTable 1 (continued) Major
43、diameter Number of threads per inch Thread series Pitch diameter Minor diameter D, d n D2, d2D1, d1Size in in in 4 UNC 2,837 6 2,729 4 6 UN 2,891 7 2,819 6 8 UN 2,918 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
44、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 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
45、 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 3,516 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
46、 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 725:2009ISO 725:2009(E) ISO 2009 All rights reserved 11Table 1 (continued) Major diameter Number of threads per inch Thread series Pitch diameter Minor diameter D, d n D2, d2D1, d1Size in in in 4 UN 3,712 6 3,60
47、4 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 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
48、,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 4,182 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,
49、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 725:2009ISO 725:2009(E) 12 ISO 2009 All rights reservedTable 1 (continued) Major diameter Number of threads per inch Thread series Pitch diameter Minor diameter D, d n D2, d2D1, d1Size in in in 4 UN 4,587 6 4,479 4 6 UN 4,641 7 4,569 6 8 UN 4,668 8 4,614 7 12 UN
