High-Speed Nut Taps / H-SNT
Whitworth coarse thread
TAP SIZE A B   C FLUTE
5/32 W 32 60.0 19.0 24T 2.7 3
3/16 W 24 65.0 25.0 24T 3.2 3
1/4 W 20 77.8 28.0 22T 4.6 3
1/4 W 20 77.8 30.0 24T 4.6 3
5/16 W 18 77.0 35.0 24T 6.0 5
3/8 W 16 89.0 40.0 24T 7.3 5
7/16 W 14 102.0 47.0 24T 8.6 5
1/2 W 12 102.0 54.0 24T 9.5 5
9/16 W 12 114.0 54.0 24T 10.5 5
5/8 W 11 127.0 59.0 24T 12.0 5
3/4 W 10 133.0 64.0 24T 15.0 5
7/8 W 9 140.0 72.0 24T 17.0 5
1" W 8 165.0 80.0 24T 20.0 5

Fot stainless steel
TAP SIZE A B   C FLUTE
1/4 W 20 75.0 36.0 28T 4.6 3
5/16 W 18 80.0 41.0 28T 6.0 5
3/8 W 16 89.0 49.0 30T 7.3 5
7/16 W 14 102.0 58.0 30T 8.6 5
1/2 W 12 120.0 67.0 30T 9.5 5
9/16 W 12 114.0 67.0 30T 10.5 5
5/8 W 11 127.0 73.0 30T 12.0 5
3/4 W 10 133.0 80.0 30T 15.0 5
7/8 W 9 145.0 89.0 30T 17.0 5
1" W 8 165.0 99.0 30T 20.0 5