WHITWORTH THREAD BSW & BSF 55O

1 2007/1 Page 1 - 2 WHITWORTH THREAD BSW & BSF 55O EXTERNAL THREAD d = Major diameter d2 = Pitch diameter d1 = Minor diameter INTERNAL THREAD D = Major diameter D2 = Pitch diameter D1 = minor diameter P = Pitch in Threads Per Inch ( ) = Flank angle 55O NUT BOLT BSW (Ref. BRITISH STANDARD 84 : 1956) Nominal diameter inches Diameter mm P External THREAD , Medium Class Internal THREAD , Normal Class Pitch diameter d2 Pitch diameter D2 max min max min 1/8 3/16 1/4 5/16 3/8 7/16 1/2 9/16 5/8 11/16 3/4 7/8 1 1 1/8 1 1/4 1 1/2 1 3/4 2 2 1/4 2 1/2 2 3/4 3 3 1/4 3 1/2 3 3/4 4 4 1/2 5 5 1/2 6 3,175 4,762 6,350 7,938 9,525 11,112 12,700 14,287 15,875 17,462 19,050 22,225 25,400 28,575 31,750 38,100 44,450 50,800 57,150 63,500 69,850 76,200 82,550 88,900 95,250 101,600 114,300 127,000 139.

2 700 152,400 40 24 20 18 16 14 12 12 11 11 10 9 8 7 7 6 5 4,5 4 4 3,5 3,5 3,25 3,25 3 3 2,875 2,75 2,65 2,5 2,738 4,054 5,507 7,000 8,473 9,914 11,306 12,890 14,354 15,941 17,379 20,419 23,368 26,251 29,426 35,390 44,196 47,186 53,083 59,433 65,202 71,552 77,546 83,896 89,830 96,180 108,643 121,087 133,505 145,895 2,664 3,965 5,408 6,894 8,359 9,792 11,173 12,756 14,211 15,794 17,226 20,257 23,195 26,068 29,238 35,187 43,978 46,954 52,840 59,179 64,938 71,277 77,264 83,607 89,530 95,872 108,323 120,754 133,157 145,537 2,879 4,216 5,685 7,193 8,682 10,137 11,539 13,134 14,610 16,203 17,653 20,663 23,627 26,523 29,708 35,695 44,524 47,534 53,449 59,812 65,601 71,961 77,970 84,331 90,279 96,639 109,123 121,587 134,026 146,434 2,769 4,084 5,537 7,033 8,509 9,952 11,344 12,931 14,397 15,984 17,424 20,419 23,368 26,251 29,426 35,390 44,196 47,186 53,083 59,433 65,202 71,552 77,546 83,896 89,830 96,180 108,643 121,087 133,505 145.

3 895 2006/1 Page 2 - 2 WHITWORTH GEVIND BSW & BSF 55O EXTERNAL THREAD d = Major diameter d2 = Pitch diameter d1 = Minor diameter INTERNAL THREAD D = Major diameter D2 = Pitch diameter D1 = minor diameter P = Pitch in Threads Per Inch ( ) = Flank angle 55O NUT BOLT BSF (Ref. BRITISH STANDARD 84 : 1956) Nominal diameter inches Diameter mm P External THREAD , Medium Class Internal THREAD , Normal Class Pitch diameter d2 Pitch diameter D2 max min max min 3/16 7/32 9/32 5/16 3/8 7/16 9/16 5/8 11/16 7/8 1 1 1/8 1 1 3/8 1 1 5/8 1 2 2 2 2 3 4,762 5,556 6,350 7,144 7,938 9,525 11,112 12,700 14,287 15,875 17,462 19,050 22,225 25,400 28,575 31,750 34,925 38,100 41,275 44,450 50,800 57,150 63,500 69,850 76.

4 200 32 28 26 26 22 20 18 16 16 14 14 12 11 10 9 9 8 8 8 7 7 6 6 6 5 4,227 4,948 5,697 6,487 7,168 8,679 10,173 11,646 13,233 14,674 16,259 17,648 20,747 23,774 26,769 29,944 32,893 36,068 39,243 42,126 48,476 54,440 60,790 67,140 72,946 4,143 4,856 5,603 6,388 7,064 8,567 10,053 11,519 13,101 14,536 16,116 17,498 20,589 23,607 26,594 29,761 32,703 35,872 39,042 41,915 48,255 54,206 60,549 66,891 72,685 4,381 5,110 5,867 6,665 7,356 8,880 10,386 11,872 13,467 14,920 16,515 17,917 20,983 24,026 27,033 30,218 33,180 36,363 39,545 42,441 48,806 54,788 61,150 67,513 73,340 4,255 4,976 5,725 6,518 7,198 8,712 10,208 11,684 13,272 14,714 16,302 17,694 20,747 23,774 26,769 29,944 32,893 36,068 39,243 42,126 48,476 54,440 60,790 67,140 72,946 mm to inches mm /