带护锥的(B型)中心钻 (摘自GB/T 6078.2—1998) (mm) |
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d |
1.00 |
(1.25) |
1.60 |
2.00 |
2.50 |
3.15 |
4.00 |
(5.00) |
6.30 |
(8.00) |
10.00 |
d1 |
4.0 |
5.0 |
6.3 |
8.0 |
10.0 |
11.2 |
14.0 |
18.0 |
20.0 |
25.0 |
31.5 |
l |
35.5 |
40.0 |
45.0 |
50.0 |
56.0 |
60.0 |
67.0 |
75.0 |
80.0 |
100.0 |
125.0 |
l1 |
1.3~1.9 |
1.6~2.2 |
2.0~2.8 |
2.5~3.3 |
3.1~4.1 |
3.9~4.9 |
5.0~6.2 |
6.3~7.5 |
8.0~9.2 |
10.1~11.5 |
12.8~14.2 |