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Countersink
SHOWIRK
HSS Cobalt Countersink is a conical hole cut into a manufactured object; a countersink bit (sometimes called simply countersink) is the cutter used to cut such a hole. A common use is to allow the head of a bolt or screw, with a shape exactly matching the countersunk hole, to sit flush with or below the surface of the surrounding material. (By comparison, a counterbore makes a flat-bottomed hole that might be used with a hex-headed capscrew.) A countersink may also be used to remove the burr left from a drilling or tapping operation.
| Specification | D1 | L | d |
| 90 Degree Countersink 4.3mm | 4.3 | 40 | 4 |
| 90 Degree Countersink 4.8mm | 4.8 | 40 | 4 |
| 90 Degree Countersink 5mm | 5 | 40 | 4 |
| 90 Degree Countersink 5.3mm | 5.3 | 40 | 4 |
| 90 Degree Countersink 5.8mm | 5.8 | 45 | 5 |
| 90 Degree Countersink 6mm | 6 | 45 | 5 |
| 90 Degree Countersink 6.3mm | 6.3 | 45 | 5 |
| 90 Degree Countersink 7mm | 7 | 50 | 6 |
| 90 Degree Countersink 7.3mm | 7.3 | 50 | 6 |
| 90 Degree Countersink 8mm | 8 | 50 | 6 |
| 90 Degree Countersink 8.3mm | 8.3 | 50 | 6 |
| 90 Degree Countersink 9.4mm | 9.4 | 50 | 6 |
| 90 Degree Countersink 10mm | 10 | 50 | 6 |
| 90 Degree Countersink 10.4mm | 10.4 | 50 | 6 |
| 90 Degree Countersink 11.5mm | 11.5 | 56 | 8 |
| 90 Degree Countersink 12.4mm | 12.4 | 56 | 8 |
| 90 Degree Countersink 13.4mm | 13.4 | 56 | 8 |
| 90 Degree Countersink 15mm | 15 | 60 | 10 |
| 90 Degree Countersink 16.5mm | 16.5 | 60 | 10 |
| 90 Degree Countersink 19mm | 19 | 60 | 10 |
| 90 Degree Countersink 20.5mm | 20.5 | 63 | 10 |
| 90 Degree Countersink 23mm | 23 | 67 | 10 |
| 90 Degree Countersink 25mm | 25 | 67 | 10 |
| 90 Degree Countersink 26mm | 26 | 71 | 12 |
| 90 Degree Countersink 28mm | 28 | 71 | 12 |
| 90 Degree Countersink 30mm | 30 | 71 | 12 |
| 90 Degree Countersink 31mm | 31 | 71 | 12 |
| 90 Degree Countersink 37mm | 37 | 90 | 12 |
| 90 Degree Countersink 40mm | 40 | 90 | 15 |
HSS Cobalt Countersink is a conical hole cut into a manufactured object; a countersink bit (sometimes called simply countersink) is the cutter used to cut such a hole. A common use is to allow the head of a bolt or screw, with a shape exactly matching the countersunk hole, to sit flush with or below the surface of the surrounding material. (By comparison, a counterbore makes a flat-bottomed hole that might be used with a hex-headed capscrew.) A countersink may also be used to remove the burr left from a drilling or tapping operation.
| Specification | D1 | L | d |
| 90 Degree Countersink 4.3mm | 4.3 | 40 | 4 |
| 90 Degree Countersink 4.8mm | 4.8 | 40 | 4 |
| 90 Degree Countersink 5mm | 5 | 40 | 4 |
| 90 Degree Countersink 5.3mm | 5.3 | 40 | 4 |
| 90 Degree Countersink 5.8mm | 5.8 | 45 | 5 |
| 90 Degree Countersink 6mm | 6 | 45 | 5 |
| 90 Degree Countersink 6.3mm | 6.3 | 45 | 5 |
| 90 Degree Countersink 7mm | 7 | 50 | 6 |
| 90 Degree Countersink 7.3mm | 7.3 | 50 | 6 |
| 90 Degree Countersink 8mm | 8 | 50 | 6 |
| 90 Degree Countersink 8.3mm | 8.3 | 50 | 6 |
| 90 Degree Countersink 9.4mm | 9.4 | 50 | 6 |
| 90 Degree Countersink 10mm | 10 | 50 | 6 |
| 90 Degree Countersink 10.4mm | 10.4 | 50 | 6 |
| 90 Degree Countersink 11.5mm | 11.5 | 56 | 8 |
| 90 Degree Countersink 12.4mm | 12.4 | 56 | 8 |
| 90 Degree Countersink 13.4mm | 13.4 | 56 | 8 |
| 90 Degree Countersink 15mm | 15 | 60 | 10 |
| 90 Degree Countersink 16.5mm | 16.5 | 60 | 10 |
| 90 Degree Countersink 19mm | 19 | 60 | 10 |
| 90 Degree Countersink 20.5mm | 20.5 | 63 | 10 |
| 90 Degree Countersink 23mm | 23 | 67 | 10 |
| 90 Degree Countersink 25mm | 25 | 67 | 10 |
| 90 Degree Countersink 26mm | 26 | 71 | 12 |
| 90 Degree Countersink 28mm | 28 | 71 | 12 |
| 90 Degree Countersink 30mm | 30 | 71 | 12 |
| 90 Degree Countersink 31mm | 31 | 71 | 12 |
| 90 Degree Countersink 37mm | 37 | 90 | 12 |
| 90 Degree Countersink 40mm | 40 | 90 | 15 |
