System of Measurement System of Measurement |
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Decimal Size Equivalent Decimal Size Equivalent |
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Shank Type Shank Type |
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Round | Hex |
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Quick-Change Hex | Tapered Square |
Bit Style Bit Style |
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![]() | Open Spiral Flute |
For Use On For Use On |
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Point Style Point Style |
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Screw |
Flute Direction Flute Direction |
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Right Hand |
Finish Finish |
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Material Material |
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REACH (Registration, Evaluation, Authorization and Restriction of Chemicals) REACH (Registration,Evaluation, Authorization and Restriction of Chemicals) |
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Individual/Set Individual/Set |
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DFARS (Defense Acquisition Regulations Supplement) DFARS (Defense AcquisitionRegulations Supplement) |
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RoHS (Restriction of Hazardous Substances) RoHS (Restriction ofHazardous Substances) |
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Drill Bit Decimal Size Equivalents
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About Drill Bits
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Chip-Clearing Drill Bits for Wood

Tapered Square/Round Shank

Hex/Round Shank

Quick-Change Hex Shank
An open spiral-flute design clears chips quickly, so these bits can bore smooth, deep holes through construction lumber, railroad ties, and utility poles. Also known as pole or ship auger bits.
Tapered square/round-shank drill bits have a tapered square shank that can be cut off to expose a round shank.
Hex/round-shank drill bits have a hex shank that can be cut off to expose a 1/2" round shank.
Black-oxide and clear-coated steel drill bits produce less friction than uncoated steel drill bits.
For technical drawings and 3-D models, click on a part number.
Size | Decimal Size Equivalent | Overall Lg. | Max. Drilling Dp. | Shank Size | Point Style | Each | |
Inch—Tapered Square/Round Shank | |||||||
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Uncoated Steel | |||||||
3/8" | 0.375" | 18" | 12" | 3/8" | Screw | 0000000 | 000000 |
1/2" | 0.5" | 18" | 12" | 3/8" | Screw | 0000000 | 00000 |
9/16" | 0.5625" | 18" | 12" | 3/8" | Screw | 0000000 | 00000 |
5/8" | 0.625" | 18" | 12" | 3/8" | Screw | 0000000 | 00000 |
3/4" | 0.75" | 18" | 12" | 5/16" | Screw | 0000000 | 00000 |
7/8" | 0.875" | 18" | 12" | 5/16" | Screw | 0000000 | 00000 |
1" | 1" | 18" | 12" | 5/16" | Screw | 0000000 | 00000 |
Inch—Hex/Round Shank | |||||||
Uncoated Steel | |||||||
9/16" | 0.5625" | 29" | 24" | 7/16" | Screw | 0000000 | 00000 |
5/8" | 0.625" | 29" | 24" | 7/16" | Screw | 0000000 | 00000 |
11/16" | 0.6875" | 29" | 24" | 7/16" | Screw | 0000000 | 00000 |
3/4" | 0.75" | 29" | 24" | 7/16" | Screw | 0000000 | 00000 |
13/16" | 0.8125" | 29" | 24" | 7/16" | Screw | 0000000 | 00000 |
7/8" | 0.875" | 29" | 24" | 7/16" | Screw | 0000000 | 00000 |
1" | 1" | 29" | 24" | 7/16" | Screw | 0000000 | 00000 |
1 1/16" | 1.0625" | 29" | 24" | 7/16" | Screw | 0000000 | 000000 |
Inch—Quick-Change Hex Shank | |||||||
Black-Oxide Steel | |||||||
1/2" | 0.5" | 17" | 12" | 3/8" | Screw | 0000000 | 00000 |
9/16" | 0.5625" | 17" | 12" | 7/16" | Screw | 0000000 | 00000 |
5/8" | 0.625" | 17" | 12" | 7/16" | Screw | 0000000 | 00000 |
3/4" | 0.75" | 17" | 12" | 7/16" | Screw | 0000000 | 00000 |
7/8" | 0.875" | 17" | 12" | 7/16" | Screw | 0000000 | 00000 |
1" | 1" | 17" | 12" | 7/16" | Screw | 0000000 | 00000 |
1 1/4" | 1.25" | 17" | 12" | 7/16" | Screw | 0000000 | 00000 |
1 3/8" | 1.375" | 17" | 12" | 7/16" | Screw | 0000000 | 00000 |
1 1/2" | 1.5" | 17" | 12" | 7/16" | Screw | 0000000 | 00000 |
1 3/4" | 1.75" | 17" | 12" | 7/16" | Screw | 0000000 | 00000 |
2" | 2" | 17" | 12" | 7/16" | Screw | 0000000 | 00000 |
Clear-Coated Steel | |||||||
7/16" | 0.4375" | 18" | 15.5" | 5/16" | Screw | 0000000 | 00000 |
1 1/8" | 1.125" | 18" | 15.5" | 7/16" | Screw | 0000000 | 00000 |
Uncoated Steel | |||||||
3/4" | 0.75" | 8" | 5" | 7/16" | Screw | 0000000 | 00000 |
7/8" | 0.875" | 8" | 5" | 7/16" | Screw | 0000000 | 00000 |
1" | 1" | 8" | 5" | 7/16" | Screw | 0000000 | 00000 |
1 1/4" | 1.25" | 8" | 5" | 7/16" | Screw | 0000000 | 00000 |
1 3/8" | 1.375" | 6 1/2" | 4" | 7/16" | Screw | 0000000 | 00000 |
1 1/2" | 1.5" | 6 1/2" | 4" | 7/16" | Screw | 0000000 | 00000 |