High-Speed Nut Taps / H-SNT
British standard fine thread
TAP SIZE A B   C FLUTE
1/4 BSF 26 77.8 24.0 24T 4.6 3
5/16 BSF 22 77.0 31.0 24T 6.0 5
3/8 BSF 20 89.0 34.0 24T 7.3 5
7/16 BSF 20 89.0 34.0 24T 9.0 5
1/2 BSF 16 102.0 37.0 24T 10.0 5
9/16 BSF 16 114.0 42.0 24T 11.0 5
5/8 BSF 14 127.0 73.0 30T 12.0 5
3/4 BSF 12 133.0 54.0 24T 15.0 5
7/8 BSF 11 140.0 59.0 24T 17.0 5
1" BSF 10 165.0 64.0 24T 21.0 5