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
13/16 0.81 10.00 0.10 0.68 0.01 64 1.39 0.71 18.1 23/32 16
7/8 0.88 9.00 0.11 0.73 0.02 711 1.48 0.58 1.27 0.75 0.50 0.75 19.3 3/4 17
15/16 0.94 9.00 0.11 0.80 0.02 71 1.58 0.83 21.0 53/64 18
1 1.00 8.00 0.13 0.84 0.02 80 1.67 0.67 1.45 0.88 0.58 0.87 22.0 55/64 19
1 - 1/8 1.13 7.00 0.14 0.94 0.02 92 1.86 0.75 1.62 1.00 0.67 0.97 24.8 31/32 20
1 - 1/4 1.25 7.00 0.14 1.07 0.02 92 2.05 0.83 1.80 1.13 0.75 1.09 27.5 1 - 3/32 21
1 - 3/8 1.38 6.00 0.17 1.16 0.02 107 2.22 0.92 1.99 1.25 0.83 1.19 30.0 1 - 3/8 22
1 - 1/2 1.50 6.00 0.17 1.29 0.02 107 2.41 1.00 2.16 1.38 0.92 1.32 33.5 1 - 5/16 23
1 - 5/8 1.63 5.00 0.20 1.37 0.03 128 2.58 1.38 35.0 1 - 3/8 24
1 - 3/4 1.75 5.00 0.20 1.49 0.03 128 2.76 1.17 2.50 1.63 1.08 1.54 39.0 1 - 17/32 25
1 - 7/8 1.88 5.00 0.22 1.59 0.03 142 1.63 41.0 1 - 5/8 26
2 2.00 5.00 0.22 1.72 0.03 142 3.15 1.33 2.68 1.75 1.17 1.75 44.5 1 - 3/4 27

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