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About Countersinks
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Choose the right countersink angle, body diameter, and number of flutes for your application.
Drill-Bit Countersinks for Wood and Plastic
High-Speed Steel
 |
4 Flutes |
The choice if you're countersinking lots of holes, these wear-resistant countersinks cut faster and last longer than carbon steel.
Manufacturer—We source from trusted manufacturers who vet raw materials for purity and use diamond grinding wheels to machine precise edges. This keeps cutting surfaces smooth and free of microscopic burrs. Because our suppliers clean their wheels more often than other manufacturers, each countersink is consistently ground to create uniform holes every time.
Countersinks | Counterbore Collars | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
Uncoated | ||||||||||||
Body Dia. | For Drill Bit Size | For Screw Size | Overall Lg. | Mfr. | Each | OD | Wd. | Each | ||||
4 Flutes | ||||||||||||
82° Countersink Angle | ||||||||||||
| 5/8" | 3/16" | No. 9 | 1 1/16" | W. L. Fuller | 2910A23 | 000000 | 7/8" | 1/4" | 2903A17 | 00000 | ||
| 5/8" | 1/4" | No. 16 | 1 1/16" | W. L. Fuller | 2910A24 | 00000 | 7/8" | 1/4" | 2903A17 | 0000 | ||
| 5/8" | 9/32" | No. 16 | 1 1/16" | W. L. Fuller | 2910A25 | 00000 | 7/8" | 1/4" | 2903A17 | 0000 | ||
| 5/8" | 5/16" | No. 18 | 1 1/16" | W. L. Fuller | 2910A26 | 00000 | 7/8" | 1/4" | 2903A17 | 0000 | ||
90° Countersink Angle | ||||||||||||
| 5/8" | 3/16" | No. 9 | 1 1/16" | W. L. Fuller | 2910A83 | 00000 | 7/8" | 1/4" | 2903A17 | 0000 | ||
| 5/8" | 1/4" | No. 16 | 1 1/16" | W. L. Fuller | 2910A84 | 00000 | 7/8" | 1/4" | 2903A17 | 0000 | ||
| 5/8" | 9/32" | No. 16 | 1 1/16" | W. L. Fuller | 2910A85 | 00000 | 7/8" | 1/4" | 2903A17 | 0000 | ||
| 5/8" | 5/16" | No. 18 | 1 1/16" | W. L. Fuller | 2910A86 | 00000 | 7/8" | 1/4" | 2903A17 | 0000 | ||
Carbon Steel
|
4 Flutes |
Stronger than high-speed steel, so it will cut through harder materials. However, high-speed steel is more precise, lasts longer, and cuts at higher speeds.
Manufacturer—We source from trusted manufacturers who vet raw materials for purity and use diamond grinding wheels to machine precise edges. This keeps cutting surfaces smooth and free of microscopic burrs. Because our suppliers clean their wheels more often than other manufacturers, each countersink is consistently ground to create uniform holes every time.
Countersinks | Counterbore Collars | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
Uncoated | ||||||||||||
Body Dia. | For Drill Bit Size | For Screw Size | Overall Lg. | Mfr. | Each | OD | Wd. | Each | ||||
4 Flutes | ||||||||||||
82° Countersink Angle | ||||||||||||
| 5/8" | 3/16" | No. 9 | 1 1/16" | W. L. Fuller | 2785A53 | 000000 | 7/8" | 1/4" | 2903A17 | 00000 | ||
| 5/8" | 1/4" | No. 16 | 1 1/16" | W. L. Fuller | 2785A54 | 00000 | 7/8" | 1/4" | 2903A17 | 0000 | ||
| 5/8" | 9/32" | No. 16 | 1 1/16" | W. L. Fuller | 2785A56 | 00000 | 7/8" | 1/4" | 2903A17 | 0000 | ||
| 5/8" | 5/16" | No. 18 | 1 1/16" | W. L. Fuller | 2785A58 | 00000 | 7/8" | 1/4" | 2903A17 | 0000 | ||
Electrically-Insulating Square Drive Size Adapters
 |
Square Drive Size (Gender) | Overall Lg. | Material | Specs. Met | Each | |||
|---|---|---|---|---|---|---|---|
| 3/8" (Female) × 1/4" (Male) | 1 1/16" | Plastic-Coated Steel | IEC 60900 | 55445A55 | 000000 | ||
Square Drive Size Adapters
 |
Square Drive Size (Gender) | Overall Lg. | Each | |||
|---|---|---|---|---|---|
Chrome-Plated Steel | |||||
| 3/8" (Female) × 1/4" (Male) | 1 1/16" | 5522A41 | 000000 | ||
Square Drive Adapters for Box Wrenches
Impact Square Drive Size Adapters
 |
Ball Detent Socket Retainer |
Convert from one square drive size to another. The female side of the adapter attaches to your wrench; the male side to your socket. These adapters are made to withstand the high torque and force of impact tools.
Square Drive Size (Gender) | Overall Lg. | Material | Color | Socket Retainer Style | Each | |||
|---|---|---|---|---|---|---|---|---|
| 3/8" (Female) × 1/4" (Male) | 1 1/16" | Magnesium Phosphate-Coated Steel | Black | Ball Detent | 53055A102 | 000000 | ||
