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About Counterbores
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Create flat-bottomed holes, so your screw heads sit flush, recessed, or slightly raised.
Drill-Point Counterbores
Skip a step when installing screws in metal. With a sharp point on the tip, these counterbores drill a pilot hole topped with a flat recess for the screw head. That's faster and more accurate than switching to a counterbore in between passes with your drill bit.
High-Speed Steel
 |
Durable and wear resistant, these counterbores make accurate cuts in most materials without chipping or cracking.
Shank | Uncoated | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
For Screw Size | Body Dia. | Overall Lg. | Dia. | Type | No. of Flutes | Max. Hole Drilling Dp. | Each | |||
| No. 5 | 0.220" | 1 7/32" | 1/4" | Round | 2 | 0.25" | 29445A11 | 000000 | ||
| No. 5 | 0.220" | 2" | 1/4" | Round | 2 | 0.414" | 29445A311 | 00000 | ||
| No. 6 | 0.242" | 1 7/32" | 1/4" | Round | 2 | 0.25" | 29445A12 | 00000 | ||
| No. 6 | 0.242" | 2" | 1/4" | Round | 2 | 0.45" | 29445A312 | 00000 | ||
| No. 8 | 0.290" | 1 15/32" | 5/16" | Round | 2 | 0.281" | 29445A13 | 00000 | ||
| No. 8 | 0.290" | 2 1/4" | 3/8" | Round | 2 | 0.534" | 29445A313 | 00000 | ||
| No. 10 | 0.332" | 1 1/2" | 5/16" | Round | 2 | 0.312" | 29445A14 | 00000 | ||
| No. 10 | 0.332" | 2 1/4" | 3/8" | Round | 2 | 0.6" | 29445A314 | 00000 | ||
| 1/4" | 0.406" | 1 3/4" | 7/16" | Round | 2 | 0.375" | 29445A15 | 00000 | ||
| 1/4" | 0.406" | 2 3/4" | 3/8" | Round | 2 | 0.84" | 29445A315 | 00000 | ||
| 5/16" | 0.490" | 1 15/16" | 1/2" | Round | 2 | 0.375" | 29445A16 | 00000 | ||
| 5/16" | 0.490" | 3" | 1/2" | Round | 2 | 1.02" | 29445A316 | 00000 | ||
| 3/8" | 0.593" | 2 11/32" | 5/8" | Round | 2 | 0.468" | 29445A17 | 00000 | ||
| 3/8" | 0.593" | 3 1/2" | 1/2" | Round | 2 | 1.218" | 29445A317 | 00000 | ||
| 7/16" | 0.687" | 2 1/2" | 5/8" | Round | 2 | 0.5" | 29445A18 | 00000 | ||
| 7/16" | 0.687" | 4" | 1/2" | Round | 2 | 1.404" | 29445A318 | 00000 | ||
| 1/2" | 0.781" | 2 11/16" | 5/8" | Round | 2 | 0.562" | 29445A19 | 00000 | ||
| 1/2" | 0.781" | 4 1/2" | 1/2" | Round | 2 | 1.596" | 29445A319 | 000000 | ||
| M3 | 5.9 mm | 1 1/4" | 1/4" | Round | 2 | 6.35 mm | 29445A21 | 00000 | ||
| M4 | 7.5 mm | 1 3/8" | 1/4" | Round | 2 | 7.54 mm | 29445A22 | 00000 | ||
| M5 | 9.1 mm | 1 1/2" | 5/16" | Round | 2 | 7.94 mm | 29445A23 | 00000 | ||
| M6 | 10.7 mm | 1 9/16" | 5/16" | Round | 2 | 9.52 mm | 29445A24 | 00000 | ||
| M8 | 13.4 mm | 1 13/16" | 7/16" | Round | 2 | 11.11 mm | 29445A25 | 00000 | ||
| M10 | 16.6 mm | 2 1/16" | 1/2" | Round | 2 | 14.29 mm | 29445A26 | 00000 | ||
| M12 | 18.7 mm | 2 7/16" | 5/8" | Round | 2 | 15.87 mm | 29445A27 | 00000 | ||
| M14 | 21.8 mm | 2 5/8" | 5/8" | Round | 2 | 16.67 mm | 29445A28 | 00000 | ||
| M16 | 24.6 mm | 2 3/4" | 5/8" | Round | 2 | 17.46 mm | 29445A29 | 00000 | ||
Oversized Long-Life Counterbore Drill Bits
 |
These counterbores are often used when screw holes in sheets or layers are misaligned. Also known as subland drill bits, they last longer than standard counterbore drill bits because the diameter stays the same after sharpening. They drill and counterbore at the same time. After drilling and counterboring, tap the hole and install your fastener. The diameters account for the 1/32” or 1/64” oversized diameter rating.
Dia. | Lg. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
For Screw Size | Body | Step | Step | Overall | No. of Flutes | Point Angle | For Use On | Each | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Uncoated High-Speed Steel | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
1/64" Oversize | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| No. 6 | 0.234" | 0.146" | 5/16" | 2 7/16" | 2 | 118° | Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel | 29525A41 | 000000 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| No. 8 | 0.281" | 0.175" | 3/8" | 4 1/4" | 2 | 118° | Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel | 29525A47 | 00000 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| No. 10 | 0.328" | 0.206" | 5/8" | 4 5/8" | 2 | 118° | Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel | 29525A49 | 00000 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| No. 10 | 0.344" | 0.206" | 1/2" | 4 3/4" | 2 | 118° | Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel | 29525A51 | 00000 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 1/4" | 0.391" | 0.266" | 1/2" | 5 1/8" | 2 | 118° | Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel | 29525A54 | 00000 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 1/4" | 0.406" | 0.266" | 1/2" | 5 1/4" | 2 | 118° | Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel | 29525A71 | 00000 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 3/8" | 0.578" | 0.391" | 3/4" | 4 1/8" | 2 | 118° | Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel | 29525A63 | 00000 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
1/32" Oversize | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 1/4" | 0.406" | 0.281" | 1/2" | 5 1/4" | 2 | 118° | Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel | 29525A55 | 00000 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 5/16" | 1/2" | 0.344" | 5/8" | 6" | 2 | 118° | Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel | 29525A62 | 00000 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 3/8" | 0.594" | 0.406" | 3/4" | 4 1/8" | 2 | 118° | Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel | 29525A64 | 00000 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Counterbore Drill Bits
 |
Often called step drill bits, these drill and counterbore holes at the same time. After drilling and counterboring, tap the hole and install your fastener. The body diameter may decrease after multiple sharpenings.
Dia. | Lg. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
For Screw Size | Body | Step | Step | Overall | Point Angle | For Use On | Each | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Uncoated High-Speed Steel | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| No. 6 | 0.250" | 0.15" | 1/2" | 4" | 118° | Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel | 8914A31 | 000000 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| No. 8 | 0.290" | 0.178" | 1/2" | 4 1/4" | 118° | Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel | 8914A32 | 00000 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| No. 10 | 0.332" | 0.204" | 5/8" | 4 3/4" | 118° | Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel | 8914A33 | 00000 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 1/4" | 0.406" | 0.281" | 11/16" | 5 1/4" | 118° | Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel | 8914A34 | 00000 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 5/16" | 0.500" | 0.344" | 3/4" | 6" | 118° | Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel | 8914A35 | 00000 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 3/8" | 0.594" | 0.406" | 7/8" | 7 1/8" | 118° | Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel | 8914A36 | 00000 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 7/16" | 0.688" | 0.469" | 1" | 7 5/8" | 118° | Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel | 8914A38 | 00000 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 1/2" | 0.781" | 0.531" | 1" | 9 7/8" | 118° | Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel | 8914A37 | 000000 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Drill-Point Counterbore Sets
 |
Skip a step when installing screws of various thread diameters in metal. With a sharp point on the tip, these counterbores drill a pilot hole topped with a flat recess for the screw head. That's faster and more accurate than switching to a counterbore in between passes with your drill bit.
High-Speed Steel—Durable and wear resistant, these counterbores make accurate cuts in most materials without chipping or cracking.
For Screw Size | No. of Pieces | Shank Type | No. of Flutes | 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" | 9 | Round | 2 | Plastic Case | 9940N111 | 0000000 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| No. 5, No. 6, No. 8, No. 10, 1/4", 5/16", 3/8", 7/16", 1/2" | 9 | Round | 2 | Plastic Case | 9940N112 | 000000 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| M3, M4, M5, M6, M8, M10, M12, M14, M16 | 9 | Round | 2 | Plastic Case | 9940N113 | 000000 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Fast-Cutting Smooth-Finish Drill-Bit Counterbores for Wood
With thin cutting edges to minimize contact with the hole, these counterbores make smooth, accurate cuts at high speeds. Attach them to any drill bit with a 1/2" shank and a cutting diameter of 1/2" or larger. They move up and down the drill bit and lock into place with set screws to match the length of the screw you're installing.
Long-Life Counterbore Drill Bits
|
Also known as subland drill bits, these last longer than standard counterbore drill bits because the diameter stays the same after sharpening. They drill and counterbore at the same time. After drilling and counterboring, tap the hole and install your fastener.
Dia. | Lg. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
For Screw Size | Body | Step | Step | Overall | No. of Flutes | Point Angle | For Use On | Each | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Uncoated High-Speed Steel | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| No. 6 | 0.228" | 0.141" | 5/16" | 3 7/8" | 2 | 118° | Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel | 29525A42 | 000000 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| No. 8 | 0.272" | 0.164" | 3/8" | 2 11/16" | 2 | 118° | Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel | 29525A44 | 00000 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| No. 10 | 0.313" | 0.190" | 1/2" | 2 13/16" | 2 | 118° | Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel | 29525A48 | 00000 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 1/4" | 0.375" | 0.250" | 1/2" | 5" | 2 | 118° | Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel | 29525A53 | 00000 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 5/16" | 0.469" | 0.313" | 5/8" | 3 5/8" | 2 | 118° | Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel | 29525A56 | 00000 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Drill-Bit Counterbore Sets for Wood
 |
Drill and counterbore holes of different depths without changing tools. These counterbores move along the drill bit (sold separately) and lock into place with set screws to match the length of the screw you're installing.
Body Dia. | No. of Pieces | Container Type | Each | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Uncoated Steel | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 3/46", 1/4", 5/16", 3/8", 7/16", 1/2" | 6 | Wood Stand | 3105A31 | 0000000 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Drill-Bit Counterbores for Wood
 |
Shown with Drill Bit (Sold Separately) |
Drill and counterbore holes of different depths without changing tools. These counterbores move along the drill bit (sold separately) and lock into place with set screws to match the length of the screw you're installing.
Steel
 |
 |
Counterbore Collars |
Counterbore Collars—Attach with a set screw to stop the counterbore at the exact depth you need.
Counterbores | Counterbore Collars | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
Uncoated | |||||||||||
Body Dia. | Overall Lg. | No. of Flutes | For Drill Bit Size | Each | OD | Wd. | Each | ||||
| 5/8" | 1" | 4 | 3/16" | 3105A11 | 000000 | 7/8" | 1/4" | 2903A17 | 00000 | ||
| 5/8" | 1" | 4 | 1/4" | 3105A21 | 00000 | 7/8" | 1/4" | 2903A17 | 0000 | ||
| 3/4" | 1" | 4 | 1/4" | 3105A12 | 00000 | 1" | 1/4" | 2903A18 | 0000 | ||
| 3/4" | 1 1/8" | 4 | 5/16" | 3105A13 | 00000 | 1" | 1/4" | 2903A18 | 0000 | ||
| 7/8" | 1 1/4" | 4 | 3/8" | 3105A14 | 00000 | 1 1/8" | 1/4" | 2903A19 | 0000 | ||
| 1" | 1 3/8" | 4 | 7/16" | 3105A15 | 00000 | 1 1/4" | 5/16" | 2903A21 | 0000 | ||
| 1 1/8" | 1 1/2" | 4 | 1/2" | 3105A16 | 00000 | 1 3/8" | 5/16" | 2903A32 | 0000 | ||
| 1 1/4" | 1 5/8" | 4 | 9/16" | 3105A22 | 00000 | 1 1/2" | 3/8" | 2903A23 | 0000 | ||
Quick-Change Hex Drill-Bit Counterbores for Wood
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Shown with Optional Drill Stop (Sold Separately) |
Pop the 1/4" hex shank into a drill chuck, power screwdriver, or impact driver to drill and counterbore a hole in a single step. These counterbores move along the included drill bit and lock into place with set screws to match the length of the screw you're installing.
Steel
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Drill Stops |
Drill Stops—Attach with a set screw to stop the counterbore at the exact depth you need. These stops have a ring on the end that rotates separately from the body. When the ring touches your workpiece, it stops spinning to prevent scratches and dents. An opening in the side clears chips from the hole as you cut.
Counterbores | Drill Stops | Replacement Drill Bits | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Shank | Black Oxide | |||||||||||||
Body Dia. | Overall Lg. | Size | Type | No. of Flutes | Max. Hole Drilling Dp. | Drill Bit Size | Each | Each | Each | |||||
| 3/8" | 2 7/8" | 1/4" | Quick-Change Hex | 3 | 1.1" | 1/8" | 3438N21 | 000000 | 3438N11 | 000000 | 2908A35 | 00000 | ||
| 1/2" | 2 7/8" | 1/4" | Quick-Change Hex | 3 | 1.2" | 1/8" | 3438N22 | 00000 | 3438N11 | 00000 | 2908A35 | 0000 | ||
| 5/8" | 3 1/4" | 1/4" | Quick-Change Hex | 3 | 1.3" | 3/16" | 3438N23 | 00000 | ——— | 0 | 2908A39 | 0000 | ||
| 5/8" | 3 21/32" | 1/4" | Quick-Change Hex | 3 | 2.7" | 1/4" | 3438N311 | 00000 | ——— | 0 | 2908A44 | 0000 | ||
| 3/4" | 3 1/4" | 1/4" | Quick-Change Hex | 3 | 1.3" | 3/16" | 3438N24 | 00000 | ——— | 0 | 2908A39 | 0000 | ||
| 3/4" | 3 5/8" | 1/4" | Quick-Change Hex | 3 | 1.6" | 1/4" | 3438N25 | 00000 | ——— | 0 | 2908A44 | 0000 | ||
| 3/4" | 3 31/32" | 1/4" | Quick-Change Hex | 3 | 3" | 5/16" | 3438N312 | 00000 | ——— | 0 | 2908A48 | 0000 | ||
| 1" | 4 11/16" | 1/4" | Quick-Change Hex | 3 | 3.7" | 7/16" | 3438N313 | 00000 | ——— | 0 | 2908A57 | 00000 | ||
