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For Screw Size For Screw Size | Show |
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For Screw Size For Screw Size | Hide |
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Body Diameter Body Diameter |
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Shank Diameter Shank Diameter |
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Individual/Set Individual/Set |
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Overall Length Overall Length |
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Finish Finish |
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DFARS (Defense Acquisition Regulations Supplement) DFARS (Defense AcquisitionRegulations Supplement) |
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Pilot Length Pilot Length |
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REACH (Registration, Evaluation, Authorization and Restriction of Chemicals) REACH (Registration,Evaluation, Authorization and Restriction of Chemicals) |
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RoHS (Restriction of Hazardous Substances) RoHS (Restriction ofHazardous Substances) |
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Shank Type Shank Type |
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 | Round |
Number of Flutes Number of Flutes |
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 | 4 |
Diameter Rating Diameter Rating |
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Material Material |
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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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Metric Size High-Speed Steel Counterbores with Built-In Pilot
These counterbores are oversized for use with screw holes in misaligned sheets or layers of material. All have a built-in pilot to maintain alignment in the hole. The body diameter and pilot diameter account for the 0.5 mm oversized diameter rating.
For technical drawings and 3-D models, click on a part number.
Dia. | Lg. | ||||||||
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| For Screw Size, mm | Body, mm | Shank | Pilot | Overall | Number of Flutes | Flute Style | For Use On | Each | |
Uncoated High-Speed Steel | |||||||||
0.5 mm Oversized | |||||||||
| 20 | 30.5 | 7/8" | 0.750" | 8 1/8" | 4 | Spiral | Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel | 0000000 | 0000000 |