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Decimal Size Equivalent Decimal Size Equivalent |
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Shank Type Shank Type |
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| Quick-Change Hex | Round |
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| Tapered Square | Hex |
Finish Finish |
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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.
| Size | Decimal Size Equivalent | Overall Lg. | Max. Drilling Dp. | Shank Size | Point Style | Each | |
Inch—Tapered Square/Round Shank | |||||||
|---|---|---|---|---|---|---|---|
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 1/8" | 1.125" | 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 |
Uncoated Steel | |||||||
| 3/4" | 0.75" | 7 5/8" | 5" | 7/16" | Screw | 0000000 | 00000 |
| 7/8" | 0.875" | 7 5/8" | 5" | 7/16" | Screw | 0000000 | 00000 |
| 1" | 1" | 7 5/8" | 5" | 7/16" | Screw | 0000000 | 00000 |
| 1 1/4" | 1.25" | 7 5/8" | 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 |