Center drill bits, also known as Slocombe drill bits, are used in metalworking to provide a starting hole for a larger-sized drill bit or to make a conical indentation in the end of a workpiece in which to mount a lathe center. In either use, the name seems appropriate, as the bit is either establishing the center of a hole or making a conical hole for a lathe center. Nevertheless, because of the frequent lumping together of both the terminology and the tool use, suppliers may call center drill bits combined-drill-and-countersinks in order to make it unambiguously clear what product is being ordered.
Type A HSS Center Drill |
d |
D |
L |
I |
1.00 |
3.15 |
33.50 |
1.90 |
1.25 |
3.15 |
33.50 |
1.90 |
1.60 |
4.00 |
37.50 |
2.80 |
2.00 |
5.00 |
42.00 |
3.30 |
2.50 |
6.30 |
47.00 |
4.10 |
3.15 |
8.00 |
52.00 |
4.90 |
4.00 |
10.00 |
59.00 |
6.20 |
5.00 |
12.50 |
66.00 |
7.50 |
6.30 |
16.00 |
74.00 |
9.20 |
Type B HSS Center Drill |
d |
D |
L |
I |
1.00 |
4.00 |
37.50 |
1.90 |
1.25 |
5.00 |
42.00 |
2.20 |
1.60 |
6.30 |
47.00 |
2.80 |
2.00 |
8.00 |
52.00 |
3.30 |
2.50 |
10.00 |
59.00 |
4.10 |
3.15 |
11.20 |
63.00 |
4.90 |
4.00 |
14.00 |
70.00 |
6.20 |
5.00 |
18.00 |
78.00 |
7.50 |
6.30 |
20.00 |
83.00 |
9.20 |
Type R HSS Center Drill |
d |
D |
L |
I |
1.00 |
3.15 |
33.50 |
3.00 |
1.25 |
3.15 |
33.50 |
3.35 |
1.60 |
4.00 |
37.50 |
4.25 |
2.00 |
5.00 |
42.00 |
5.30 |
2.50 |
6.30 |
47.00 |
6.70 |
3.15 |
8.00 |
52.00 |
8.50 |
4.00 |
10.00 |
59.00 |
10.60 |
5.00 |
12.50 |
66.00 |
13.20 |
6.30 |
16.00 |
74.00 |
17.00 |
Other specification is also available according to your requirements. (OEM, ODM )
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