Drill Bit Decimal Size Equivalents
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About Drill Bits
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Cobalt Steel Multidiameter Drill Bits
With better heat and wear resistance than high-speed steel, cobalt steel bits can run up to 25% faster and have a longer tool life. Steps with progressively larger diameters let you drill a range of sizes with one bit. Also known as step drills.
For technical drawings and 3-D models, click on a part number.
Shank | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Drill Bit Size | Decimal Size Equivalent | No. of Sizes | Overall Lg. | For Max. Material Thick. | Type | Size | Point Style | For Use On | Each | |
Inch | ||||||||||
Uncoated Cobalt Steel | ||||||||||
| 1/8", 5/32", 3/16", 7/32", 1/4", 9/32", 5/16", 11/32", 3/8", 13/32", 7/16", 15/32", 1/2" | 0.125", 0.1563", 0.1875", 0.2188", 0.25", 0.2813", 0.3125", 0.3438", 0.375", 0.4063", 0.4375", 0.4688", 0.5" | 13 | 3 1/4" | 1/8" | Hex | 1/4" | Standard | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel | 0000000 | 000000 |
| 3/16", 1/4", 5/16", 3/8", 7/16", 1/2" | 0.1875", 0.25", 0.3125", 0.375", 0.4375", 0.5" | 6 | 3 3/8" | 3/8" | Hex | 1/4" | Standard | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel | 0000000 | 00000 |
| 3/16", 1/4", 5/16", 3/8", 7/16", 1/2", 9/16", 5/8", 11/16", 3/4", 13/16", 7/8" | 0.1875", 0.25", 0.3125", 0.375", 0.4375", 0.5", 0.5625", 0.625", 0.6875", 0.75", 0.8125", 0.875" | 12 | 3" | 1/8" | Hex | 3/8" | Standard | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel | 0000000 | 00000 |
| 1/4", 5/16", 3/8", 7/16", 1/2", 9/16", 5/8", 11/16", 3/4" | 0.25", 0.3125", 0.375", 0.4375", 0.5", 0.5625", 0.625", 0.6875", 0.75" | 9 | 2 5/8" | 1/8" | Hex | 3/8" | Standard | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel | 0000000 | 00000 |
| 9/16", 5/8", 11/16", 3/4", 13/16", 7/8", 15/16", 1" | 0.5625", 0.625", 0.6875", 0.75", 0.8125", 0.875", 0.9375", 1" | 8 | 2 1/2" | 1/8" | Hex | 7/16" | Standard | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel | 0000000 | 00000 |
| 7/8", 1 1/8" | 0.875", 1.125" | 2 | 3" | 1/8" | Hex | 7/16" | Standard | Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel | 0000000 | 000000 |