Whitworth Coarse Thread BS 84
BSW (British Standard Whitworth)

British Standard Whitworth Coarse Thread Series (parallel, cylindrical)
In GB most common Thread. Corresponds to the Metric Thread in its type of use.
The flank angle is 55°.

Nominal
Diameter
Major
Diameter
Inch
Major
Diameter
mm
Tapping
Drill Size
mm
TPI Pitch
mm
W 1/16" 1/16 1.588 1.05 60 0.423
W 3/32" 3/32 2.381 1.70 48 0.529
W 1/8" 1/8 3.175 2.36 40 0.635
W 5/32" 5/32 3.969 2.95 32 0.794
W 3/16" 3/16 4.763 3.41 24 1.058
W 7/32" 7/32 5.556 4.20 24 1.058
W 1/4" 1/4 6.350 4.72 20 1.270
W 5/16" 5/16 7.940 6.13 18 1.411
W 3/8" 3/8 9.525 7.49 16 1.587
W 7/16" 7/16 11.113 8.79 14 1.814
W 1/2" 1/2 12.700 9.99 12 2.117
W 9/16" 9/16 14.288 11.58 12 2.117
W 5/8" 5/8 15.875 12.92 11 2.309
W 3/4" 3/4 19.050 15.80 10 2.540
W 7/8" 7/8 22.225 18.61 9 2.822
W 1" 1 25.400 21.34 8 3.175
W 1 1/8" 1 1/8 28.575 23.93 7 3.628
W 1 1/4" 1 1/4 31.750 27.11 7 3.628
W 1 3/8" 1 3/8 34.925 29.51 6 4.233
W 1 1/2" 1 1/2 38.100 32.68 6 4.233
W 1 5/8" 1 5/8 41.275 34.77 5 5.080
W 1 3/4" 1 3/4 44.450 37.95 5 5.080
W 1 7/8" 1 7/8 47.625 40.40 4.5 5.644
W 2" 2 50.800 43.58 4.5 5.644
W 2 1/4" 2 1/2 57.150 49.02 4 6.350
W 2 1/2" 2 1/2 63.500 55.37 4 6.350
W 2 3/4" 2 3/4 69.850 60.56 3.5 7.257
W 3" 3 76.200 66.91 3.5 7.257
W 3 1/4" 3 1/4 82.550 72.55 3.25 7.815
W 3 1/2" 3 1/2 88.900 78.90 3.25 7.815
W 3 3/4" 3 3/4 95.250 84.41 3 8.467
W 4" 4 101.600 90.76 3 8.467