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 Counterbore Sets with Built-In Pilot
The built-in pilot maintains alignment in the hole.
Sizes Included | Number of Pieces | Pilot Lg. | Number of Flutes | Flute Style | Shank Type | For Use On | Each | |
Uncoated High-Speed Steel | ||||||||
---|---|---|---|---|---|---|---|---|
No. 4, No. 5, No. 6, No. 8, No. 10, 1/4", 3/8", 5/16", 7/16", 1/2" | 10 | 0.156", 0.188", 0.219", 0.250", 0.281", 0.313", 0.375", 0.500" | 4 | Spiral | Round | Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel | 0000000 | 0000000 |
Metric Size Counterbore Sets with Built-In Pilot
The counterbores in this set are oversized for counterboring screw holes in sheets or layers of material that are misaligned. All have a built-in pilot to maintain alignment in the hole.
Dia. Rating | Sizes Included | Number of Pieces | Pilot Lg. | Number of Flutes | Flute Style | Shank Type | For Use On | Each | |
Uncoated High-Speed Steel | |||||||||
---|---|---|---|---|---|---|---|---|---|
0.5 mm Oversized | 3 mm, 4 mm, 5 mm, 6 mm, 8 mm, 10 mm, 12 mm, 14 mm | 8 | 0.218", 0.250", 0.281", 0.312", 0.375", 0.500", 0.562" | 4 | Spiral | Round | Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel | 0000000 | 0000000 |
Oversized Counterbore Sets with Built-In Pilot
Use these oversized counterbore sets when the screw holes in sheets or layers of material are misaligned. They have a built-in pilot to maintain alignment in the hole.
Dia. Rating | Sizes Included | Number of Pieces | Pilot Lg. | Number of Flutes | Flute Style | Shank Type | For Use On | Each | |
Uncoated High-Speed Steel | |||||||||
---|---|---|---|---|---|---|---|---|---|
1/64" Oversized | No. 4, No. 5, No. 6, No. 8, No. 10, 1/4", 5/16", 3/8", 7/16", 1/2" | 10 | 0.156", 0.188", 0.219", 0.250", 0.281", 0.313", 0.375", 0.500" | 4 | Spiral | Round | Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel | 0000000 | 0000000 |
1/32" Oversized | No. 4, No. 5, No. 6, No. 8, No. 10, 1/4", 5/16", 3/8", 7/16", 1/2" | 10 | 0.156", 0.188", 0.219", 0.250", 0.281", 0.313", 0.375", 0.500" | 4 | Spiral | Round | Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel | 0000000 | 000000 |
Metric Size Drill-Point Counterbore Sets
No need for separate tools, these sets have counterbores in various sizes that drill and counterbore holes with enough clearance for socket head cap screws. The longer the counterbore, the thicker the material it can drill.
Diameter | ||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
Sizes Included | Number of Pieces | Body | Shank | Drill Tip | Overall Length | Maximum Hole Drilling Depth | Number of Flutes | Shank Type | For Use On | Container Type | Each | |
Uncoated High-Speed Steel | ||||||||||||
3 mm 4 mm 5 mm 6 mm 8 mm 10 mm 12 mm 14 mm 16 mm | 9 | 5.95 mm 7.54 mm 9.13 mm 10.71 mm 13.49 mm 16.66 mm 18.75 mm 21.82 mm 24.6 mm | 1/4" 1/4" 5/16" 5/16" 7/16" 1/2" 5/8" 5/8" 5/8" | 3.57 mm 4.36 mm 5.55 mm 6.35 mm 8.73 mm 10.32 mm 12.7 mm 14.68 mm 16.67 mm | 1 9/32" 1 13/32" 1 9/16" 1 5/8" 1 29/32" 2 5/32" 2 9/16" 2 27/32" 3 1/2" | 6.35 mm 7.54 mm 7.94 mm 9.52 mm 11.11 mm 14.29 mm 15.87 mm 16.67 mm 17.46 mm | 2 | Round | Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel | Plastic Case | 00000000 | 0000000 |
Inch Size Drill-Point Counterbore Sets
Keep counterbores in various sizes on hand to drill and counterbore holes with enough clearance for socket head cap screws without changing tools. The longer the counterbore, the thicker the material it can drill.
Diameter | ||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
Sizes Included | Overall Length | Number of Pieces | Body | Shank | Drill Tip | Maximum Hole Drilling Depth | Number of Flutes | Shank Type | For Use On | Container Type | Each | |
Uncoated High-Speed Steel | ||||||||||||
No. 5 No. 6 No. 8 No. 10 1/4" 5/16" 3/8" 7/16" 1/2" | 1 7/32" 1 7/32" 1 15/32" 1 1/2" 1 3/4" 1 15/16" 2 11/32" 2 1/2" 2 11/16" | 9 | 0.22" 0.242" 0.29" 0.332" 0.406" 0.49" 0.593" 0.687" 0.781" | 1/4" 1/4" 5/16" 5/16" 7/16" 1/2" 5/8" 5/8" 5/8" | 0.138" 0.15" 0.178" 0.2" 0.28" 0.34" 0.406" 0.468" 0.532" | 1/4" 1/4" 0.281" 0.312" 3/8" 3/8" 0.468" 1/2" 0.562" | 2 | Round | Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel | Plastic Case | 00000000 | 0000000 |
No. 5 No. 6 No. 8 No. 10 1/4" 5/16" 3/8" 7/16" 1/2" | 2" 2" 2 1/4" 2 1/4" 2 3/4" 3" 3 1/2" 4" 4 1/2" | 9 | 0.22" 0.242" 0.29" 0.332" 0.406" 0.49" 0.593" 0.687" 0.781" | 1/4" 1/4" 3/8" 3/8" 3/8" 1/2" 1/2" 1/2" 1/2" | 0.138" 0.15" 0.178" 0.2" 0.28" 0.34" 0.406" 0.468" 0.532" | 0.414" 0.45" 0.534" 0.6" 0.84" 1.02" 1.218" 1.404" 1.596" | 2 | Round | Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel | Plastic Case | 00000000 | 000000 |
Changeable-Pilot Counterbore Sets
Change out the pilot to use the same tool to counterbore multiple diameters. Set includes 5 counterbores and 10 pilots.
Sizes Included | Number of Pieces | Includes | Shank Type | For Use On | Container Type | Each | |
Uncoated High-Speed Steel | |||||||
---|---|---|---|---|---|---|---|
1/4", 5/16", 3/8", 7/16", 1/2" | 5 | 10 Pilots | Round | Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel | Wood Case | 0000000 | 0000000 |
Drill-Bit Counterbore Sets
Convert standard jobbers’ or brad-point drill bits into counterboring drill bits for drilling and counterboring in one step.
For technical drawings and 3-D models, click on a part number.
Sizes Included | Number of Pieces | For Use On | Container Type | Each | |
Uncoated Steel | |||||
---|---|---|---|---|---|
3/16", 1/4", 5/16", 3/8", 7/16", 1/2" | 6 | Plastic, Wood | Wood Stand | 0000000 | 0000000 |