中心鉆
不帶護(hù)錐中心鉆 -A型 020 CENTRE DRILLS WITHOUT PROTECTIVE TAPER-TYPE A 020 帶護(hù)錐中心鉆 -B型 021 CENTRE DRILLS WITH PROTECTIVE TAPER-TYPE B 021 A 020 B 021 1.0 3.15 31.5 1.3 1.0 4 2.12 36.5 1.3 1.25 3.15 31.5 1.6 1.25 5 2.65 40 1.6 1.6 4 35.5 2.0 1.6 6.3 3.35 45 2.0 2.0 5 40 2.5 2.0 8 4.25 50 2.5 2.5 6.3 45 3.1 2.5 10 5.3 56 3.1 3.15 8 50 3.9 3.15 11.2 6.7 60 3.9 4.0 10 56 5.0 4.0 14 8.5 67 5.0 5.0 12.5 63 6.3 5.0 18 10.6 75 6.3 6.3 16 71 8.0 6.3 20 13.2 80 8.0 8.0 20 80 10.1 8.0 25 17 100 10.1 10.0 25 100 12.8 10.0 31.5 21.2 125 12.8 1.0 3.15 31.5 1.3 1.0 4 2.12 36.5 1.3