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Addison Centre Drills
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High Speed Steel CENTRE DRILLS |
Specification conform |
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Dimensions in Inches |
A center drills are used to make conical indentation or a starting point before using a larger diameter drills. Addison manufactures HSS M2 steel center drills in type a, type b and in BS series.
| BS No. | Body Dia | Pilot Dia | Pilot Length | ORL | Tolerance on Overall Length | |
| Max. | Min. | |||||
| 1 2 |
1/8 3/16 |
3/64 1/16 |
5/64 3/32 |
1/16 5/64 |
1.1/2 1.3/4 |
±1/32 |
| 3 4 |
1/4 5/16 |
3/32 1/8 |
5/32 3/16 |
1/8 5/32 |
2 2.1/4 |
±1/16 |
| 5 6 7 |
7/16 5/8 3/4 |
3/16 1/4 5/16 |
9/32 3/8 15/32 |
1/4 5/16 13/32 |
2.1/2 3 3.1/2 |
±3/32 |
