About Drill Bits
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Drill Bit Decimal Size Equivalents
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1/4" Diameter Reduced-Shank Drill Bits
The shank has a smaller diameter than the tip, allowing you to drill large holes with machines that have small-capacity chucks.
For technical drawings and 3-D models, click on a part number.
Shank | |||||||||
---|---|---|---|---|---|---|---|---|---|
Drill Bit Size | Decimal Size Equivalent | Overall Lg. | Max. Drilling Dp. | Type | Size | Point Style | For Use On | Each | |
Inch | |||||||||
Black-Oxide High-Speed Steel | |||||||||
17/64" | 0.2656" | 3 1/2" | 1.88" | Reduced Round | 1/4" | Standard | Steel, Iron, Stainless Steel | 0000000 | 00000 |
9/32" | 0.2813" | 3 5/8" | 1.97" | Reduced Round | 1/4" | Standard | Steel, Iron, Stainless Steel | 0000000 | 0000 |
5/16" | 0.3125" | 3 7/8" | 2.19" | Reduced Round | 1/4" | Standard | Steel, Iron, Stainless Steel | 0000000 | 0000 |
3/8" | 0.375" | 4 1/4" | 2.56" | Reduced Round | 1/4" | Standard | Steel, Iron, Stainless Steel | 0000000 | 00000 |
25/64" | 0.3906" | 4 3/8" | 2.63" | Reduced Round | 1/4" | Standard | Steel, Iron, Stainless Steel | 0000000 | 00000 |
13/32" | 0.4063" | 4 1/2" | 2.75" | Reduced Round | 1/4" | Standard | Steel, Iron, Stainless Steel | 0000000 | 00000 |
27/64" | 0.4219" | 4 5/8" | 2.84" | Reduced Round | 1/4" | Standard | Steel, Iron, Stainless Steel | 0000000 | 00000 |
7/16" | 0.4375" | 4 3/4" | 2.94" | Reduced Round | 1/4" | Standard | Steel, Iron, Stainless Steel | 0000000 | 00000 |
29/64" | 0.4531" | 4 3/4" | 3.03" | Reduced Round | 1/4" | Standard | Steel, Iron, Stainless Steel | 0000000 | 00000 |
15/32" | 0.4688" | 4 7/8" | 3.13" | Reduced Round | 1/4" | Standard | Steel, Iron, Stainless Steel | 0000000 | 00000 |
31/64" | 0.4844" | 5" | 3.22" | Reduced Round | 1/4" | Standard | Steel, Iron, Stainless Steel | 0000000 | 00000 |
1/2" | 0.5" | 5" | 3.22" | Reduced Round | 1/4" | Standard | Steel, Iron, Stainless Steel | 0000000 | 00000 |