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About Drill Bits
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Drill Bit Decimal Size Equivalents
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Drill Bits for Aluminum, Brass, and Bronze
Because softer metal, like aluminum, brass, and bronze, can clog a bit, the flutes on these bits lift chips out of the hole. Also known as slow-spiral drill bits. They are jobbers' length and have the rigidity and length required for most applications.
Shank | Each | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Size | Decimal Size Equivalent | Overall Lg. | Max. Drilling Dp. | Type | Size | Point Style | 1-11 | 12-Up | |
Inch—Spiral Flute | |||||||||
Uncoated High-Speed Steel | |||||||||
| 1/16" | 0.0625" | 1 7/8" | 0.75" | Round | 1/16" | Standard | 00000000 | 00000 | 00000 |
| 5/64" | 0.0781" | 2" | 0.84" | Round | 5/64" | Standard | 00000000 | 0000 | 0000 |
| 3/32" | 0.0938" | 2 1/4" | 1.06" | Round | 3/32" | Standard | 00000000 | 0000 | 0000 |
| 7/64" | 0.1094" | 2 5/8" | 1.28" | Round | 7/64" | Standard | 00000000 | 0000 | 0000 |
| 1/8" | 0.125" | 2 3/4" | 1.37" | Round | 1/8" | Standard | 00000000 | 0000 | 0000 |
| 9/64" | 0.1406" | 2 7/8" | 1.46" | Round | 9/64" | Standard | 00000000 | 0000 | 0000 |
| 5/32" | 0.1563" | 3 1/8" | 1.68" | Round | 5/32" | Standard | 00000000 | 0000 | 0000 |
| 11/64" | 0.1719" | 3 1/4" | 1.78" | Round | 11/64" | Standard | 00000000 | 0000 | 0000 |
| 3/16" | 0.1875" | 3 1/2" | 1.93" | Round | 3/16" | Standard | 00000000 | 0000 | 0000 |
| 13/64" | 0.2031" | 3 5/8" | 2.03" | Round | 13/64" | Standard | 00000000 | 0000 | 0000 |
| 7/32" | 0.2188" | 3 3/4" | 2.06" | Round | 7/32" | Standard | 00000000 | 0000 | 0000 |
| 15/64" | 0.2344" | 3 7/8" | 2.15" | Round | 15/64" | Standard | 00000000 | 0000 | 0000 |
| 1/4" | 0.25" | 4" | 2.25" | Round | 1/4" | Standard | 00000000 | 0000 | 0000 |
| 17/64" | 0.2656" | 4 1/8" | 2.34" | Round | 17/64" | Standard | 00000000 | 0000 | 0000 |
| 9/32" | 0.2813" | 4 1/4" | 2.37" | Round | 9/32" | Standard | 00000000 | 0000 | 0000 |
| 19/64" | 0.2969" | 4 3/8" | 2.46" | Round | 19/64" | Standard | 00000000 | 0000 | 0000 |
| 1-5 | 6-Up | ||||||||
| 5/16" | 0.3125" | 4 1/2" | 2.56" | Round | 5/16" | Standard | 00000000 | 0000 | 0000 |
| 21/64" | 0.3281" | 4 5/8" | 2.65" | Round | 21/64" | Standard | 00000000 | 00000 | 0000 |
| 11/32" | 0.3438" | 4 3/4" | 2.75" | Round | 11/32" | Standard | 00000000 | 00000 | 00000 |
| 23/64" | 0.3594" | 4 7/8" | 2.78" | Round | 23/64" | Standard | 00000000 | 00000 | 00000 |
| 3/8" | 0.375" | 5" | 2.87" | Round | 3/8" | Standard | 00000000 | 00000 | 00000 |
| 25/64" | 0.3906" | 5 1/8" | 2.96" | Round | 25/64" | Standard | 00000000 | 00000 | 00000 |
| 13/32" | 0.4063" | 5 1/4" | 3.06" | Round | 13/32" | Standard | 00000000 | 00000 | 00000 |
| 27/64" | 0.4219" | 5 3/8" | 3.09" | Round | 27/64" | Standard | 00000000 | 00000 | 00000 |
| 7/16" | 0.4375" | 5 1/2" | 3.18" | Round | 7/16" | Standard | 00000000 | 00000 | 00000 |
| 29/64" | 0.4531" | 5 5/8" | 3.28" | Round | 29/64" | Standard | 00000000 | 00000 | 00000 |
| 15/32" | 0.4688" | 5 3/4" | 3.37" | Round | 15/32" | Standard | 00000000 | 00000 | 00000 |
| 31/64" | 0.4844" | 5 7/8" | 3.4" | Round | 31/64" | Standard | 00000000 | 00000 | 00000 |
| 1/2" | 0.5" | 6" | 3.5" | Round | 1/2" | Standard | 00000000 | 00000 | 00000 |
| 1-11 | 12-Up | ||||||||
Wire Gauge—Spiral Flute | |||||||||
Uncoated High-Speed Steel | |||||||||
| 80 ga | 0.0135" | 3/4" | 0.09" | Round | 0.0135" | Standard | 00000000 | 0000 | 0000 |
| 79 ga | 0.0145" | 3/4" | 0.09" | Round | 0.0145" | Standard | 00000000 | 0000 | 0000 |
| 78 ga | 0.016" | 7/8" | 0.15" | Round | 0.016" | Standard | 00000000 | 0000 | 0000 |
| 77 ga | 0.018" | 7/8" | 0.15" | Round | 0.018" | Standard | 00000000 | 0000 | 0000 |
| 76 ga | 0.02" | 7/8" | 0.14" | Round | 0.02" | Standard | 00000000 | 0000 | 0000 |
| 75 ga | 0.021" | 1" | 0.2" | Round | 0.021" | Standard | 00000000 | 0000 | 0000 |
| 74 ga | 0.0225" | 1" | 0.2" | Round | 0.0225" | Standard | 00000000 | 0000 | 0000 |
| 73 ga | 0.024" | 1 1/8" | 0.26" | Round | 0.024" | Standard | 00000000 | 0000 | 0000 |
| 72 ga | 0.025" | 1 1/8" | 0.26" | Round | 0.025" | Standard | 00000000 | 0000 | 0000 |
| 71 ga | 0.026" | 1 1/4" | 0.32" | Round | 0.026" | Standard | 00000000 | 0000 | 0000 |
| 70 ga | 0.028" | 1 1/4" | 0.31" | Round | 0.028" | Standard | 00000000 | 0000 | 0000 |
| 69 ga | 0.0292" | 1 3/8" | 0.44" | Round | 0.0292" | Standard | 00000000 | 0000 | 0000 |
| 68 ga | 0.031" | 1 3/8" | 0.43" | Round | 0.031" | Standard | 00000000 | 0000 | 0000 |
| 67 ga | 0.032" | 1 3/8" | 0.43" | Round | 0.032" | Standard | 00000000 | 0000 | 0000 |
| 66 ga | 0.033" | 1 3/8" | 0.43" | Round | 0.033" | Standard | 00000000 | 0000 | 0000 |
| 65 ga | 0.035" | 1 1/2" | 0.55" | Round | 0.035" | Standard | 00000000 | 0000 | 0000 |
| 64 ga | 0.036" | 1 1/2" | 0.55" | Round | 0.036" | Standard | 00000000 | 0000 | 0000 |
| 63 ga | 0.037" | 1 1/2" | 0.55" | Round | 0.037" | Standard | 00000000 | 0000 | 0000 |