1. BSF, Whit, & Cycle Threads
  2. British Std Whitworth

British Std Whitworth

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BSW (British Standard Whitworth) A coarse thread devised and standardised at Manchester in 1841 by British Engineer Sir Joseph Whitworth (1803 - 87). It is used in many types of engineering particularly in aluminium. Angle of Thread = 55 Degrees Sizes range from 1/16" to 2-1/2"
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Size Outside Dia Inch Tpi Pitch Inch Core Dia Inch Radius Inch Thread Depth Thou Hex A/flats Inch Head Depth Inch Washer Face Dia Inch Standard Nut Depth Inch Lock Nut Depth Inch Tapping Drill Size Inch Tapping Drill Size Mm Letter Or Number Id
1/16 0.06 60.00 0.02 0.04 0.00 11 0.05 1.1 56 1
3/32 0.09 48.00 0.03 0.07 0.00 13 0.07 1.8 50 2
1/8 0.13 40.00 0.03 0.09 0.00 16 0.34 0.10 2.5 40 3
5/32 0.16 32.00 0.03 0.12 0.00 20 0.12 3.1 31 4
3/16 0.19 24.00 0.04 0.13 0.01 27 0.45 0.15 3.7 27 5
7/32 0.22 24.00 0.04 0.17 0.01 27 0.17 4.4 17 6
1/4 0.25 20.00 0.05 0.19 0.01 32 0.53 0.18 0.43 0.20 0.19 0.20 5.1 8 7
5/16 0.31 18.00 0.06 0.24 0.01 36 0.60 0.22 0.51 0.25 0.21 0.26 6.5 E 8
3/8 0.38 16.00 0.06 0.30 0.01 40 0.71 0.26 0.58 0.31 0.26 0.31 8.0 5/16 9
7/16 0.44 14.00 0.07 0.35 0.01 46 0.82 0.30 0.69 0.38 0.28 0.36 9.2 23/64 10
1/2 0.50 12.00 0.08 0.39 0.01 53 0.92 0.34 0.80 0.44 0.30 0.41 10.5 Z 11
9/16 0.56 12.00 0.08 0.46 0.01 53 1.01 0.38 0.90 0.50 0.33 0.48 12.1 31/64 12
5/8 0.63 11.00 0.09 0.51 0.01 58 1.10 0.42 0.99 0.56 0.38 0.53 13.5 17/32 13
11/16 0.69 11.00 0.09 0.57 0.01 58 1.20 0.59 15.0 19/32 14
3/4 0.75 10.00 0.10 0.62 0.01 64 1.30 0.50 1.18 0.69 0.46 0.64 16.3 41/64 15

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