Description
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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