For Use On For Use On |
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Material Material |
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System of Measurement System of Measurement |
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Drill Bit Size Drill Bit Size |
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Length Class Length Class |
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![]() | Maintenance Length |
Flute Direction Flute Direction |
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Right Hand |
Body Diameter Body Diameter |
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Number of Flutes Number of Flutes |
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![]() | 2 |
Decimal Size Equivalent Decimal Size Equivalent |
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Finish Finish |
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Overall Length Overall Length | Show |
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Overall Length Overall Length | Hide |
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Individual/Set Individual/Set |
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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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DFARS (Defense Acquisition Regulations Supplement) DFARS (Defense AcquisitionRegulations Supplement) |
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Maximum Drilling Depth Maximum Drilling Depth |
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Point Angle Point Angle |
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Drill Bit Decimal Size Equivalents
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About Drill Bits
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About Countersinks
Countersinks cut a cone-shaped opening to install screws and rivets flush with a surface or hold workpieces between centers on a lathe. They can also be used for chamfering and deburring.
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Carbide Drill Bits with Coolant Holes

Holes in these bits allow coolant to be run through the tool for more efficient chip evacuation. Use them in CNC machines with coolant-through technology. Made of solid carbide for the highest accuracy and longest tool life, they are harder, stronger, and more wear resistant than high-speed steel, cobalt steel, and carbide-tipped bits. They retain a sharp, hard edge at high temperatures for the best performance on hard and abrasive material. A titanium aluminum nitride (TiAlN) coating gives them additional wear and temperature resistance. The four-facet point keeps the bit centered without a pilot hole. These bits require rigid toolholding to prevent breakage and should not be used in hand-held drilling applications.
Maintenance-length drill bits are shorter and more rigid than jobbers'-length bits but longer than short-length bits. They hold up better than jobbers' bits when drilling in hard metal. Also known as mechanics' bits.
For technical drawings and 3-D models, click on a part number.
Shank | ||||||||||
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Size | Decimal Size Equivalent | Overall Lg. | Max. Drilling Dp. | Type | Size | Point Style | No. of Coolant Holes | For Use On | Each | |
Inch—Maintenance Length | ||||||||||
Titanium-Aluminum-Nitride (TiAlN) Coated Carbide | ||||||||||
5/16" | 0.3125" | 3 3/32" | 1.47" | Round | 5/16" | Four Facet | 2 | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel, Titanium, Fiberglass | 00000000 | 000000 |
Drill-Bit Countersinks with Drill Bit

These countersinks come attached to a high-speed steel jobbers’ bit for drilling and countersinking at the same time. They have a hex shank that fits in all quick-change and standard drill chucks. The bit is held in place with a set screw and can be adjusted up to 1” for different screw lengths. The 82° countersink angle is compatible with the profile of flat- and oval-head inch screws.
For technical drawings and 3-D models, click on a part number.
Countersinks | |||||||||||
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For Screw Size | 82° Countersink Angle | Replacement Drill Bits | |||||||||
Hard Wood | Soft Wood | Drill Bit Size | Body Dia. | Shank Size | Overall Lg. | Max. Hole Drilling Dp. | For Use On | Each | Each | ||
Uncoated High-Speed Steel | |||||||||||
2 Flute | |||||||||||
No. 10 | No. 12 | 9/64" | 1/2" | 1/4" | 3 3/32" | 1" | Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel, Wood | 0000000 | 00000 | 0000000 | 00000 |