System of Measurement System of Measurement |
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Number of Flutes Number of Flutes |
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 | 2 |
Shank Type Shank Type |
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 | Round |
Material Material |
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Number of Countersinking Ends Number ofCountersinking Ends |
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Finish Finish |
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Individual/Set Individual/Set |
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REACH (Registration, Evaluation, Authorization and Restriction of Chemicals) REACH (Registration,Evaluation, Authorization and Restriction of Chemicals) |
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Point Angle Point Angle |
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DFARS (Defense Acquisition Regulations Supplement) DFARS (Defense AcquisitionRegulations Supplement)  |
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RoHS (Restriction of Hazardous Substances) RoHS (Restriction ofHazardous Substances) |
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Shank Material Shank Material |
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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.
More
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.
For technical drawings and 3-D models, click on a part number.
Dia. | Lg. | 90° Countersink Angle | |||||||
|---|---|---|---|---|---|---|---|---|---|
| For Tap Thread 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 |