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About Countersinks
Countersinks cut a cone-shaped opening to install screws and rivets flush with a surface or hold workpieces between centers on a lathe. They can also be used for chamfering and deburring.
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Countersinking Drill Bits for Taps
Also called subland drill bits, these bits countersink as they drill to prepare holes for tapping. The 90° countersink angle guides the tap into the hole. The drill bit diameter will not change after sharpening.
Dia. | Lg. | 90° Countersink Angle | |||||||
|---|---|---|---|---|---|---|---|---|---|
| For Tap Size | Body | Step | Step | Overall | Shank Dia. | Point Angle | For Use On | Each | |
Uncoated High-Speed Steel | |||||||||
2 Flute | |||||||||
| 6-32 | 0.156" | 0.107" | 5/16" | 3 1/8" | 0.156" | 118° | Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel | 00000000 | 000000 |
| 8-32 | 0.188" | 0.136" | 3/8" | 3 1/2" | 0.188" | 118° | Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel | 00000000 | 00000 |
| 10-32 | 0.219" | 0.159" | 1/2" | 3 3/4" | 0.219" | 118° | Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel | 00000000 | 00000 |
| 1/4"-20 | 0.281" | 0.201" | 1/2" | 4 1/4" | 0.281" | 118° | Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel | 00000000 | 00000 |
| 1/4"-28 | 0.313" | 0.213" | 5/8" | 4 1/2" | 0.313" | 118° | Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel | 00000000 | 00000 |
| 5/16"-18 | 0.438" | 0.257" | 11/16" | 5 1/2" | 0.438" | 118° | Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel | 00000000 | 00000 |
| 5/16"-24 | 0.375" | 0.272" | 11/16" | 5" | 0.375" | 118° | Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel | 00000000 | 00000 |
| 3/8"-16 | 0.438" | 0.313" | 3/4" | 5 1/2" | 0.438" | 118° | Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel | 00000000 | 00000 |
| 7/16"-14 | 0.500" | 0.368" | 3/4" | 6" | 0.5" | 118° | Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel | 00000000 | 00000 |