About Counterbores
Counterboring—Enlarge the top of an existing hole to create a cylindrical-shaped opening with a flat bottom that acts as a seat for the head of a screw or wood plug.
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Inch Size High-Speed Steel Counterbores with Built-In Pilot
The built-in pilot maintains alignment in the hole.
Titanium nitride (TiN) coated counterbores are more wear and heat resistant than uncoated counterbores.
For technical drawings and 3-D models, click on a part number.
Dia. | Pilot | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| For Screw Size  | Body | Shank | Dia. | Lg. | Overall Lg. | Number of Flutes | Flute Style | For Use On | Each | |
Uncoated High-Speed Steel | ||||||||||
| 7/8" | 1.322" | 7/8" | 7/8" | 0.875" | 8 1/8" | 4 | Spiral | Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel | 0000000 | 0000000 |
Titanium Nitride (TiN) Coated High-Speed Steel | ||||||||||
| 7/8" | 1.322" | 7/8" | 7/8" | 0.875" | 8 1/8" | 4 | Spiral | Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel | 00000000 | 000000 |
Oversized High-Speed Steel Counterbores with Built-In Pilot
Use these oversized counterbores when the screw holes in sheets or layers of material are misaligned. The built-in pilot maintains alignment in the hole. The body diameter and pilot diameter account for the 1/32” or 1/64” oversized diameter rating.
Titanium nitride (TiN) coated counterbores are more wear and heat resistant than uncoated counterbores.
For technical drawings and 3-D models, click on a part number.
Dia. | Pilot | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| For Screw Size | Body | Shank | Dia. | Lg. | Overall Lg. | Number of Flutes | Flute Style | For Use On | Each | |
Uncoated High-Speed Steel | ||||||||||
1/64" Oversized | ||||||||||
| 7/8" | 1.338" | 7/8" | 0.891" | 0.875" | 8 1/8" | 4 | Spiral | Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel | 0000000 | 0000000 |
1/32" Oversized | ||||||||||
| 7/8" | 1.353" | 7/8" | 0.906" | 0.875" | 8 1/8" | 4 | Spiral | Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel | 0000000 | 000000 |
Titanium Nitride (TiN) Coated High-Speed Steel | ||||||||||
1/64" Oversized | ||||||||||
| 7/8" | 1.338" | 7/8" | 0.891" | 0.875" | 8 1/8" | 4 | Spiral | Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel | 00000000 | 000000 |
1/32" Oversized | ||||||||||
| 7/8" | 1.353" | 7/8" | 0.906" | 0.875" | 8 1/8" | 4 | Spiral | Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel | 00000000 | 000000 |
Carbide-Tipped Counterbores with Built-In Pilot for Steel
To resist damage when cutting steel, these counterbores are C5 carbide-tipped alloy steel. The built-in pilot maintains alignment in the hole.
For technical drawings and 3-D models, click on a part number.
Dia. | Pilot | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| For Screw Size | Body | Shank | Dia. | Lg. | Overall Lg. | Number of Flutes | Flute Style | For Use On | Each | |
Uncoated C5 Carbide-Tipped Alloy Steel | ||||||||||
| 7/8" | 1.322" | 7/8" | 7/8" | 0.875" | 8 1/8" | 4 | Spiral | Steel | 00000000 | 0000000 |
Oversized Carbide-Tipped Counterbores with Built-In Pilot for Steel
Counterbore screw holes in misaligned sheets or layers of material. These counterbores are C5 carbide-tipped alloy steel to resist damage when used with steel. They have a built-in pilot to maintain alignment in the hole. The body diameter and pilot diameter account for the 1/32” or 1/64” oversized diameter rating.
For technical drawings and 3-D models, click on a part number.
Carbide-Tipped Counterbores with Built-In Pilot
for Aluminum, Brass, Bronze, and Cast Iron
C2 carbide-tipped alloy steel has excellent performance on abrasive materials such as cast iron and nonferrous metals. The built-in pilot maintains alignment in the hole.
For technical drawings and 3-D models, click on a part number.
Dia. | Pilot | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| For Screw Size | Body | Shank | Dia. | Lg. | Overall Lg. | Number of Flutes | Flute Style | For Use On | Each | |
Uncoated C2 Carbide-Tipped Alloy Steel | ||||||||||
| 7/8" | 1.322" | 7/8" | 7/8" | 0.875" | 8 1/8" | 4 | Spiral | Aluminum, Brass, Bronze, Cast Iron | 00000000 | 0000000 |
Oversized Carbide-Tipped Counterbores with Built-In
Pilot for Aluminum, Brass, Bronze, and Cast Iron
Use these counterbores with screw holes in misaligned sheets or layers of material. They are C2 carbide-tipped alloy steel for excellent performance on abrasive materials such as cast iron and nonferrous metals. The built-in pilot maintains alignment in the hole. The body diameter and pilot diameter account for the 1/32” or 1/64” oversized diameter rating.
For technical drawings and 3-D models, click on a part number.
Dia. | Pilot | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| For Screw Size | Body | Shank | Dia. | Lg. | Overall Lg. | Number of Flutes | Flute Style | For Use On | Each | |
Uncoated C2 Carbide-Tipped Alloy Steel | ||||||||||
1/64" Oversized | ||||||||||
| 7/8" | 1.338" | 7/8" | 57/64" | 0.875" | 8 1/8" | 4 | Spiral | Aluminum, Brass, Bronze, Cast Iron | 00000000 | 0000000 |
1/32" Oversized | ||||||||||
| 7/8" | 1.353" | 7/8" | 29/32" | 0.875" | 8 1/8" | 4 | Spiral | Aluminum, Brass, Bronze, Cast Iron | 00000000 | 000000 |