Transcription of WHITWORTH THREAD BSW & BSF 55O
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WHITWORTH THREAD BSW & BSF 55O
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
3.08 2007/1 Page 1 - 2 WHITWORTH THREAD – BSW & BSF 55O EXTERNAL THREAD d = Major diameter d 2 = Pitch diameter d 1 = Minor diameter INTERNAL THREAD D = Major diameter D 2 = Pitch diameter
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