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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High-Speed Steel Vibration-Resistant
Through-Hole Countersinks with Pilot for Screws
The built-in pilot maintains alignment in the hole. Also known as zero-flute countersinks, these have an angled hole that passes through the center of the tool to reduce vibration and chatter, which creates smooth cuts and prevents chips from clogging the countersink. The 82° countersink angle is compatible with the profile of flat- and oval-head inch screws.
For technical drawings and 3-D models, click on a part number.
Pilot | 82° Countersink Angle | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| For Hole Dia. | For Screw Size  | Body Dia. | Shank Dia. | Dia. | Lg. | Overall Lg. | For Use On | Each | |
Uncoated High-Speed Steel | |||||||||
0 Flute | |||||||||
| 1/4" to 33/64" | 1/4" | 33/64" | 3/8" | 1/4" | 5/32" | 2" | Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel | 0000000 | 000000 |
High-Speed Steel Drill-Point Countersinks for Screws
A small drill point at the tip lets you use the same tool for drilling and countersinking holes. An 82° countersink angle is compatible with the profile of flat- and oval-head inch screws; a 90° countersink angle is compatible with the profile of flat- and oval-head metric screws and is also good for deburring.
For technical drawings and 3-D models, click on a part number.
Dia. | 82° Countersink Angle | ||||||
|---|---|---|---|---|---|---|---|
| For Screw Size | Body | Shank | Drill Tip | Overall Lg. | For Use On | Each | |
Uncoated High-Speed Steel | |||||||
2 Flute | |||||||
| 1/4" | 1/2" | 3/8" | 0.252" | 2 3/8" | Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel | 00000000 | 000000 |
Countersinking Drill Bits for Screws
Also known as step drill bits, these bits countersink as they drill. The 82° countersink angle is compatible with the profile of flat- and oval-head inch screws. After multiple sharpenings, the drill bit diameter may become smaller.
For technical drawings and 3-D models, click on a part number.
Dia. | Lg. | 82° Countersink Angle | |||||||
|---|---|---|---|---|---|---|---|---|---|
| For Screw Size | Body | Step | Step | Overall | Shank Dia. | Point Angle | For Use On | Each | |
Uncoated High-Speed Steel | |||||||||
2 Flute | |||||||||
| 1/4" | 0.500" | 0.257" | 11/16" | 6" | 0.5000" | 118° | Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel | 0000000 | 000000 |
High-Speed Steel Drill-Point Countersink Sets for Screws
Small drill points let you drill and countersink holes with the same tool. The 82° countersink angle is compatible with the profile of flat- and oval-head inch screws.
For technical drawings and 3-D models, click on a part number.
82° Countersink Angle | ||||||||
|---|---|---|---|---|---|---|---|---|
| For Screw Size | Number of Pieces | Number of Flutes | Number of Countersinking Ends | Shank Type | For Use On | Container Type | Set | |
Uncoated High-Speed Steel | ||||||||
| No. 5, No. 6, No. 8, No. 10, No. 12, 1/4", 5/16", 3/8" | 8 | 2 | 1 | Round | Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel | Plastic Case | 00000000 | 0000000 |