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Body Diameter Body Diameter |
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Overall Length Overall Length |
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Drill Tip Diameter Drill Tip Diameter |
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Diameter Rating Diameter Rating |
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Individual/Set Individual/Set |
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Step Diameter Step Diameter |
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Finish Finish |
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DFARS (Defense Acquisition Regulations Supplement) DFARS (Defense AcquisitionRegulations Supplement) |
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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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About Drill Bits
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Inch Size Drill-Point Counterbores
Drill and counterbore holes with enough clearance for socket head screws.
Dia. | ||||||||
|---|---|---|---|---|---|---|---|---|
| For Screw Size | Body | Shank | Drill Tip | Overall Lg. | Number of Flutes | For Use On | Each | |
Uncoated High-Speed Steel | ||||||||
| No. 5 | 0.220" | 1/4" | 0.138" | 1 7/32" | 2 | Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel | 00000000 | 000000 |
| No. 6 | 0.242" | 1/4" | 0.15" | 1 7/32" | 2 | Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel | 00000000 | 00000 |
| No. 8 | 0.290" | 5/16" | 0.178" | 1 15/32" | 2 | Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel | 00000000 | 00000 |
| No. 10 | 0.332" | 5/16" | 0.2" | 1 1/2" | 2 | Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel | 00000000 | 00000 |
| 1/4" | 0.406" | 7/16" | 0.28" | 1 3/4" | 2 | Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel | 00000000 | 00000 |
| 5/16" | 0.490" | 1/2" | 0.34" | 1 15/16" | 2 | Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel | 00000000 | 00000 |
| 3/8" | 0.593" | 5/8" | 0.406" | 2 11/32" | 2 | Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel | 00000000 | 00000 |
| 7/16" | 0.687" | 5/8" | 0.468" | 2 1/2" | 2 | Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel | 00000000 | 00000 |
| 1/2" | 0.781" | 5/8" | 0.532" | 2 11/16" | 2 | Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel | 00000000 | 00000 |
Metric Size Drill-Point Counterbores
The same tool lets you drill and counterbore holes with enough clearance for socket head screws.
Dia. | ||||||||
|---|---|---|---|---|---|---|---|---|
| For Screw Size, mm | Body, mm | Shank | Drill Tip, mm | Overall Lg. | Number of Flutes | For Use On | Each | |
Uncoated High-Speed Steel | ||||||||
| 3 | 5.95 | 1/4" | 3.57 | 1 9/32" | 2 | Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel | 00000000 | 000000 |
| 4 | 7.54 | 1/4" | 4.36 | 1 13/32" | 2 | Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel | 00000000 | 00000 |
| 5 | 9.13 | 5/16" | 5.55 | 1 9/16" | 2 | Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel | 00000000 | 00000 |
| 6 | 10.71 | 5/16" | 6.35 | 1 5/8" | 2 | Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel | 00000000 | 00000 |
| 8 | 13.49 | 7/16" | 8.73 | 1 29/32" | 2 | Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel | 00000000 | 00000 |
| 10 | 16.66 | 1/2" | 10.32 | 2 5/32" | 2 | Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel | 00000000 | 00000 |
| 12 | 18.75 | 5/8" | 12.7 | 2 9/16" | 2 | Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel | 00000000 | 00000 |
| 14 | 21.82 | 5/8" | 14.68 | 2 27/32" | 2 | Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel | 00000000 | 00000 |
| 16 | 24.6 | 5/8" | 16.67 | 3 1/32" | 2 | Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel | 00000000 | 00000 |
Oversized Long-Life Counterboring 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 counterboring 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.
For technical drawings and 3-D models, click on a part number.
Dia. | Lg. | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| For Screw Size | Body | Step | Step | Overall | Number of Flutes | Point Angle | For Use On | Each | |
Uncoated High-Speed Steel | |||||||||
1/64" Oversized | |||||||||
| No. 6 | 0.234" | 0.146" | 5/16" | 2 7/16" | 2 | 118° | Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel | 00000000 | 000000 |
| No. 8 | 0.281" | 0.175" | 3/8" | 4 1/4" | 2 | 118° | Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel | 00000000 | 00000 |
| No. 10 | 0.328" | 0.206" | 5/8" | 4 5/8" | 2 | 118° | Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel | 00000000 | 00000 |
| No. 10 | 0.344" | 0.206" | 1/2" | 4 3/4" | 2 | 118° | Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel | 00000000 | 00000 |
| 1/4" | 0.391" | 0.266" | 1/2" | 5 1/8" | 2 | 118° | Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel | 00000000 | 00000 |
| 1/4" | 0.406" | 0.266" | 1/2" | 5 1/4" | 2 | 118° | Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel | 00000000 | 00000 |
| 3/8" | 0.578" | 0.391" | 3/4" | 4 1/8" | 2 | 118° | Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel | 00000000 | 00000 |
1/32" Oversized | |||||||||
| 1/4" | 0.406" | 0.281" | 1/2" | 5 1/4" | 2 | 118° | Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel | 00000000 | 00000 |
| 5/16" | 0.500" | 0.344" | 5/8" | 6" | 2 | 118° | Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel | 00000000 | 00000 |
| 3/8" | 0.594" | 0.406" | 3/4" | 4 1/8" | 2 | 118° | Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel | 00000000 | 00000 |
Long-Life Counterboring Drill Bits
Also known as subland drill bits, these last longer than standard counterboring 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.
For technical drawings and 3-D models, click on a part number.
Dia. | Lg. | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| For Screw Size | Body | Step | Step | Overall | Number 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 | 00000000 | 000000 |
| No. 8 | 0.272" | 0.164" | 3/8" | 2 11/16" | 2 | 118° | Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel | 00000000 | 00000 |
| No. 10 | 0.313" | 0.190" | 1/2" | 2 13/16" | 2 | 118° | Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel | 00000000 | 00000 |
| 1/4" | 0.375" | 0.250" | 1/2" | 5" | 2 | 118° | Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel | 00000000 | 00000 |
| 5/16" | 0.469" | 0.313" | 5/8" | 3 5/8" | 2 | 118° | Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel | 00000000 | 00000 |
Counterboring 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.
For technical drawings and 3-D models, click on a part number.
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 | 0000000 | 000000 |
| No. 8 | 0.290" | 0.178" | 1/2" | 4 1/4" | 118° | Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel | 0000000 | 00000 |
| No. 10 | 0.332" | 0.204" | 5/8" | 4 3/4" | 118° | Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel | 0000000 | 00000 |
| 1/4" | 0.406" | 0.281" | 11/16" | 5 1/4" | 118° | Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel | 0000000 | 00000 |
| 5/16" | 0.500" | 0.344" | 3/4" | 6" | 118° | Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel | 0000000 | 00000 |
| 3/8" | 0.594" | 0.406" | 7/8" | 7 1/8" | 118° | Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel | 0000000 | 00000 |
| 7/16" | 0.688" | 0.469" | 1" | 7 5/8" | 118° | Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel | 0000000 | 00000 |
| 1/2" | 0.781" | 0.531" | 1" | 9 7/8" | 118° | Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel | 0000000 | 00000 |
Drill-Bit Counterbores
Attach one of these counterbores to a standard jobbers’ or brad-point drill bit (sold separately) to convert it into a counterboring drill bit. Lock the counterbore into position on the drill bit with the two set screws.
Optional collar (not included) controls the cutting depth of your counterbore. It attaches with two set screws.
Counterbores | Optional Collars | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Body Dia. | For Drill Bit Size | Overall Lg. | Number of Flutes | For Use On | Each | OD | Wd. | Each | ||
Uncoated Steel | ||||||||||
| 5/8" | 1/4" | 1" | 4 | Plastic, Wood | 0000000 | 000000 | 7/8" | 1/4" | 0000000 | 00000 |
| 5/8" | 3/16" | 1" | 4 | Plastic, Wood | 0000000 | 00000 | 7/8" | 1/4" | 0000000 | 0000 |
| 3/4" | 1/4" | 1" | 4 | Plastic, Wood | 0000000 | 00000 | 1" | 1/4" | 0000000 | 0000 |
| 3/4" | 5/16" | 1 1/8" | 4 | Plastic, Wood | 0000000 | 00000 | 1" | 1/4" | 0000000 | 0000 |
| 7/8" | 3/8" | 1 1/4" | 4 | Plastic, Wood | 0000000 | 00000 | 1 1/8" | 1/4" | 0000000 | 0000 |
| 1" | 7/16" | 1 3/8" | 4 | Plastic, Wood | 0000000 | 00000 | 1 1/4" | 5/16" | 0000000 | 0000 |
| 1 1/8" | 1/2" | 1 1/2" | 4 | Plastic, Wood | 0000000 | 00000 | 1 3/8" | 5/16" | 0000000 | 0000 |
| 1 1/4" | 9/16" | 1 5/8" | 4 | Plastic, Wood | 0000000 | 00000 | 1 1/2" | 3/8" | 0000000 | 0000 |
Drill-Bit Counterbores with Drill Bit
These counterbores are attached to a drill bit for drilling and counterboring in a single step. Use them to create flat bottomed holes that act as seats for the heads of lag screws, washer head screws, and tee nuts. All have a 1/4" hex shank that fits quick-change drill chucks, power screwdrivers, and impact drivers. Lock the drill bit in place with the included set screw. For tough resistance to wear, corrosion, and heat, the drill bit is titanium nitride (TiN) coated.
Use the optional rotating depth stops to drill holes to a precise depth. The end of the collar has a ring that rotates separately from the body. When the ring touches your workpiece, it stops moving to prevent scratches or rub marks. The wide opening leaves room for chips to clear the drilling area.
Counterbores | Replacement Drill Bits | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Shank | Each | ||||||||||||
| Body Dia. | Drill Bit Size | Overall Lg. | Max. Hole Drilling Dp. | Type | Size | Drill Bit Material | Number of Flutes | For Use On | Each | 1-5 | 6-Up | ||
Black-Oxide Steel | |||||||||||||
| 3/8" | 1/8" | 2 7/8" | 1.1" | Hex | 1/4" | Titanium Nitride (TiN) Coated High-Speed Steel | 3 | Aluminum, Brass, Plastic, Wood | 0000000 | 000000 | 0000000 | 00000 | 00000 |
| 1/2" | 1/8" | 2 7/8" | 1.2" | Hex | 1/4" | Titanium Nitride (TiN) Coated High-Speed Steel | 3 | Aluminum, Brass, Plastic, Wood | 0000000 | 00000 | 0000000 | 0000 | 0000 |
| 5/8" | 3/16" | 3 1/4" | 1.3" | Hex | 1/4" | Titanium Nitride (TiN) Coated High-Speed Steel | 3 | Aluminum, Brass, Plastic, Wood | 0000000 | 00000 | 0000000 | 0000 | 0000 |
| 3/4" | 1/4" | 3 5/8" | 1.6" | Hex | 1/4" | Titanium Nitride (TiN) Coated High-Speed Steel | 3 | Aluminum, Brass, Plastic, Wood | 0000000 | 00000 | 0000000 | 0000 | 0000 |
| 3/4" | 3/16" | 3 1/4" | 1.3" | Hex | 1/4" | Titanium Nitride (TiN) Coated High-Speed Steel | 3 | Aluminum, Brass, Plastic, Wood | 0000000 | 00000 | 0000000 | 0000 | 0000 |
| Optional Rotating Depth Stop for 3/8", 1/2" Body Dia. Counterbores | 0000000 | Each | 000000 |
Large-Diameter Drill-Bit Counterbores
Also known as multi-spur counterbores, these have two set screws to secure them to a woodworking drill bit (sold separately). Lock the counterbore into position on the drill bit with the two set screws.
| Body Dia. | For Min. Drill Bit Cutting Dia. | For Shank Dia. | Overall Lg. | For Use On | Each | |
Uncoated Carbon Steel | ||||||
|---|---|---|---|---|---|---|
| 1 1/8" | 1/2" | 1/2" | 1" | Wood | 0000000 | 000000 |
| 1 1/4" | 1/2" | 1/2" | 1" | Wood | 0000000 | 00000 |
| 1 3/8" | 1/2" | 1/2" | 1" | Wood | 0000000 | 00000 |
| 1 1/2" | 1/2" | 1/2" | 1" | Wood | 0000000 | 00000 |
| 1 3/4" | 1/2" | 1/2" | 1" | Wood | 0000000 | 000000 |
| 2" | 1/2" | 1/2" | 1 1/4" | Wood | 0000000 | 000000 |
| 2 1/2" | 1/2" | 1/2" | 1 1/4" | Wood | 0000000 | 000000 |
Drill-Bit Counterbore Sets
Convert standard jobbers’ or brad-point drill bits into counterboring drill bits for drilling and counterboring in one step.
| Sizes Included | Number of Pieces | For Use On | Container Type | Set | |
Uncoated Steel | |||||
|---|---|---|---|---|---|
| 3/16", 1/4", 5/16", 3/8", 7/16", 1/2" | 6 | Plastic, Wood | Wood Stand | 0000000 | 0000000 |