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About Counterbores
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Create flat-bottomed holes, so your screw heads sit flush, recessed, or slightly raised.
Oversized Counterbores
Designed to give screw heads a slightly loose fit, these counterbores are a bit wider than standard sizes. The extra clearance prevents binding and leaves room for a seal or O-ring around the screw head.
High-Speed Steel
 |
Durable and wear resistant, these counterbores make accurate cuts in most materials without chipping or cracking.
Pilot | Shank | Uncoated | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
For Screw Size | Body Dia., mm | Dia., mm | Lg. | Overall Lg. | Dia. | Type | No. of Flutes | Each | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
0.5 mm Oversize | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| M3 | 6.0 | 3.5 | 0.219" | 4 1/2" | 3/16" | Round | 4 | 2740A11 | 000000 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| M4 | 7.5 | 4.5 | 0.250" | 5" | 1/4" | Round | 4 | 2740A12 | 00000 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| M5 | 9.0 | 5.5 | 0.281" | 5 5/8" | 5/16" | Round | 4 | 2740A13 | 00000 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| M6 | 10.5 | 6.5 | 0.313" | 5 5/8" | 5/16" | Round | 4 | 2740A14 | 00000 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| M8 | 13.5 | 8.5 | 0.375" | 6 1/2" | 1/2" | Round | 4 | 2740A15 | 00000 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| M10 | 16.5 | 10.5 | 0.500" | 7" | 1/2" | Round | 4 | 2740A16 | 00000 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| M12 | 18.5 | 12.5 | 0.500" | 7 1/8" | 1/2" | Round | 4 | 2740A17 | 00000 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| M14 | 21.5 | 14.5 | 0.563" | 7 1/2" | 5/8" | Round | 4 | 2740A18 | 00000 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| M16 | 24.5 | 16.5 | 0.625" | 7 5/8" | 5/8" | Round | 4 | 2740A22 | 000000 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| M20 | 30.5 | 20.5 | 0.750" | 8 1/8" | 7/8" | Round | 4 | 2740A26 | 000000 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Oversized Counterbore Sets
 |
Designed to give screw heads a slightly loose fit, these counterbores are a bit wider than standard sizes. The extra clearance prevents binding and leaves room for a seal or O-ring around the screw head.
High-Speed Steel—Durable and wear resistant, these counterbores make accurate cuts in most materials without chipping or cracking.
For Screw Size | No. of Pieces | Oversize Amount, mm | Shank Type | No. of Flutes | Each | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Uncoated High-Speed Steel | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| M3, M4, M5, M6, M8, M10, M12, M14 | 8 | 0.5 | Round | 4 | 2740A19 | 0000000 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Drill-Point Counterbores
Skip a step when installing screws in metal. With a sharp point on the tip, these counterbores drill a pilot hole topped with a flat recess for the screw head. That's faster and more accurate than switching to a counterbore in between passes with your drill bit.
High-Speed Steel
 |
Durable and wear resistant, these counterbores make accurate cuts in most materials without chipping or cracking.
Shank | Uncoated | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
For Screw Size | Body Dia., mm | Overall Lg. | Dia. | Type | No. of Flutes | Max. Hole Drilling Dp., mm | Each | |||
| M3 | 5.9 | 1 1/4" | 1/4" | Round | 2 | 6.35 | 29445A21 | 000000 | ||
| M4 | 7.5 | 1 3/8" | 1/4" | Round | 2 | 7.54 | 29445A22 | 00000 | ||
| M5 | 9.1 | 1 1/2" | 5/16" | Round | 2 | 7.94 | 29445A23 | 00000 | ||
| M6 | 10.7 | 1 9/16" | 5/16" | Round | 2 | 9.52 | 29445A24 | 00000 | ||
| M8 | 13.4 | 1 13/16" | 7/16" | Round | 2 | 11.11 | 29445A25 | 00000 | ||
| M10 | 16.6 | 2 1/16" | 1/2" | Round | 2 | 14.29 | 29445A26 | 00000 | ||
| M12 | 18.7 | 2 7/16" | 5/8" | Round | 2 | 15.87 | 29445A27 | 00000 | ||
| M14 | 21.8 | 2 5/8" | 5/8" | Round | 2 | 16.67 | 29445A28 | 00000 | ||
| M16 | 24.6 | 2 3/4" | 5/8" | Round | 2 | 17.46 | 29445A29 | 00000 | ||
Drill-Point Counterbore Sets
 |
Skip a step when installing screws of various thread diameters in metal. With a sharp point on the tip, these counterbores drill a pilot hole topped with a flat recess for the screw head. That's faster and more accurate than switching to a counterbore in between passes with your drill bit.
High-Speed Steel—Durable and wear resistant, these counterbores make accurate cuts in most materials without chipping or cracking.
For Screw Size | No. of Pieces | Shank Type | No. of Flutes | Container Type | Each | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Uncoated High-Speed Steel | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| M3, M4, M5, M6, M8, M10, M12, M14, M16 | 9 | Round | 2 | Plastic Case | 9940N113 | 0000000 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
