Drill Bit Decimal Size Equivalents
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About Drill Bits
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Maintenance-Length Drill Bits
Also known as mechanics’ bits, these are shorter and more rigid than jobbers' bits but longer than short‐length bits. A split point keeps the bit centered without a pilot hole.
Drill bits with flats on shank have three flat sides to prevent the bit from slipping in the drill chuck.
For technical drawings and 3-D models, click on a part number.
Shank | Each | Pkg. | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Drill Bit Size | Decimal Size Equivalent | Overall Lg. | Max. Drilling Dp. | Type | Size | Point Style | Features | For Use On | Each | Pkg. Qty. | Pkg. | ||
Inch | |||||||||||||
Black-and-Gold-Oxide High-Speed Steel | |||||||||||||
| 1/16" | 0.0625" | 1 7/8" | 0.88" | Round | 1/16" | Split | __ | Steel, Iron, Stainless Steel | 000000000 | 00000 | __ | 000000 | 00 |
| 5/64" | 0.0781" | 2" | 1" | Round | 5/64" | Split | __ | Steel, Iron, Stainless Steel | 000000000 | 0000 | __ | 000000 | 00 |
| 3/32" | 0.0938" | 2 1/4" | 1.25" | Round | 3/32" | Split | __ | Steel, Iron, Stainless Steel | 000000000 | 0000 | __ | 000000 | 00 |
| 7/64" | 0.1094" | 2 3/8" | 1.31" | Round | 7/64" | Split | __ | Steel, Iron, Stainless Steel | 000000000 | 0000 | __ | 000000 | 00 |
| 1/8" | 0.125" | 2 1/2" | 1.44" | Round | 1/8" | Split | __ | Steel, Iron, Stainless Steel | 000000000 | 0000 | __ | 000000 | 00 |
| 9/64" | 0.1406" | 2 5/8" | 1.56" | Round | 9/64" | Split | __ | Steel, Iron, Stainless Steel | 000000000 | 0000 | __ | 000000 | 00 |
| 5/32" | 0.1563" | 2 3/4" | 1.69" | Round | 5/32" | Split | __ | Steel, Iron, Stainless Steel | 000000000 | 0000 | __ | 000000 | 00 |
| 11/64" | 0.1719" | 2 7/8" | 1.81" | Round | 11/64" | Split | __ | Steel, Iron, Stainless Steel | 000000000 | 0000 | __ | 000000 | 00 |
| 3/16" | 0.1875" | 3" | 1.75" | Round | 3/16" | Split | Flats on Shank | Steel, Iron, Stainless Steel | 00000000 | 0000 | 12 | 0000000 | 000000 |
| 13/64" | 0.2031" | 3 1/8" | 1.81" | Round | 13/64" | Split | Flats on Shank | Steel, Iron, Stainless Steel | 00000000 | 0000 | 12 | 00000000 | 00000 |
| 7/32" | 0.2188" | 3 1/4" | 1.87" | Round | 7/32" | Split | Flats on Shank | Steel, Iron, Stainless Steel | 00000000 | 0000 | 12 | 00000000 | 00000 |
| 15/64" | 0.2344" | 3 3/8" | 1.93" | Round | 15/64" | Split | Flats on Shank | Steel, Iron, Stainless Steel | 00000000 | 0000 | 12 | 00000000 | 00000 |
| 1/4" | 0.25" | 3 1/2" | 1.87" | Round | 1/4" | Split | Flats on Shank | Steel, Iron, Stainless Steel | 00000000 | 0000 | 12 | 00000000 | 00000 |
| 17/64" | 0.2656" | 3 5/8" | 2" | Round | 17/64" | Split | Flats on Shank | Steel, Iron, Stainless Steel | 00000000 | 0000 | 12 | 00000000 | 00000 |
| 9/32" | 0.2813" | 3 3/4" | 2.18" | Round | 9/32" | Split | Flats on Shank | Steel, Iron, Stainless Steel | 00000000 | 0000 | 12 | 00000000 | 00000 |
| 19/64" | 0.2969" | 3 7/8" | 2.34" | Round | 19/64" | Split | Flats on Shank | Steel, Iron, Stainless Steel | 00000000 | 0000 | __ | 000000 | 00 |
| 5/16" | 0.3125" | 4" | 2.46" | Round | 5/16" | Split | Flats on Shank | Steel, Iron, Stainless Steel | 00000000 | 0000 | 6 | 00000000 | 00000 |
| 21/64" | 0.3281" | 4 1/8" | 2.48" | Round | 21/64" | Split | Flats on Shank | Steel, Iron, Stainless Steel | 00000000 | 0000 | 6 | 00000000 | 00000 |
| 11/32" | 0.3438" | 4 1/8" | 2.5" | Round | 11/32" | Split | Flats on Shank | Steel, Iron, Stainless Steel | 00000000 | 0000 | 6 | 00000000 | 00000 |
| 23/64" | 0.3594" | 4 1/4" | 2.56" | Round | 23/64" | Split | Flats on Shank | Steel, Iron, Stainless Steel | 00000000 | 0000 | 6 | 00000000 | 00000 |
| 3/8" | 0.375" | 4 1/4" | 2.56" | Round | 3/8" | Split | Flats on Shank | Steel, Iron, Stainless Steel | 00000000 | 0000 | 6 | 00000000 | 00000 |
| 25/64" | 0.3906" | 4 3/8" | 2.62" | Round | 25/64" | Split | Flats on Shank | Steel, Iron, Stainless Steel | 00000000 | 0000 | 6 | 00000000 | 00000 |
| 13/32" | 0.4063" | 4 3/8" | 2.68" | Round | 13/32" | Split | Flats on Shank | Steel, Iron, Stainless Steel | 00000000 | 0000 | 6 | 00000000 | 00000 |
| 27/64" | 0.4219" | 4 1/2" | 2.75" | Round | 27/64" | Split | Flats on Shank | Steel, Iron, Stainless Steel | 00000000 | 00000 | __ | 000000 | 00 |
| 7/16" | 0.4375" | 4 1/2" | 2.81" | Round | 7/16" | Split | Flats on Shank | Steel, Iron, Stainless Steel | 00000000 | 00000 | 6 | 00000000 | 00000 |
| 29/64" | 0.4531" | 4 5/8" | 2.87" | Round | 29/64" | Split | Flats on Shank | Steel, Iron, Stainless Steel | 00000000 | 00000 | __ | 000000 | 00 |
| 15/32" | 0.4688" | 4 3/4" | 3" | Round | 15/32" | Split | Flats on Shank | Steel, Iron, Stainless Steel | 00000000 | 00000 | __ | 000000 | 00 |
| 31/64" | 0.4844" | 4 7/8" | 3.21" | Round | 31/64" | Split | Flats on Shank | Steel, Iron, Stainless Steel | 00000000 | 00000 | __ | 000000 | 00 |
| 1/2" | 0.5" | 5" | 3.34" | Round | 1/2" | Split | Flats on Shank | Steel, Iron, Stainless Steel | 00000000 | 00000 | 6 | 00000000 | 00000 |