HSS Centre Drills

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Additional information

Type A Pilot Dia mm (Body Dia mm)

1 (3.15), 1.25 (3.15), 1.6 (4), 2 (5), 2.5 (6.3), 3.15 (8), 4 (10), 5 (12.5), 6.3 (16), 8 (20), 10 (25)

Type B Pilot Dia mm (Body Dia mm)

1.6 (6.3), 2 (8), 2.5 (10), 3.15 (11.2), 4 (14), 5 (18), 6.3 (20), 8 (25)

Type BS 328 (part2)1950 Size BS No. Pilot Dia inches (Body Dia inch)

1 3/64 (1/8), 2 1/16 (3/16), 3 3/32 (1/4), 4 1/8 (5/16), 5 3/16 (7/16), 6 1/4 (5/8), 7 5/16 (3/4)