About Drill Bits
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Drill Bit Decimal Size Equivalents
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Drill Bits for Paper and Fabric
These bits have razor-sharp cutting edges for making clean holes in fibrous material. They are standard Style A bits for use with Challenge and Lassco paper-drilling machines.
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 | Each | |
Inch | |||||||
Uncoated Steel | |||||||
| 1/8" | 0.125" | 3 1/8" | 1" | Round | 11/16" | 0000000 | 000000 |
| 3/16" | 0.1875" | 3 1/8" | 1 3/4" | Round | 11/16" | 0000000 | 00000 |
| 1/4" | 0.25" | 3 1/8" | 2" | Round | 11/16" | 0000000 | 00000 |
| 5/16" | 0.3125" | 3 1/8" | 2" | Round | 11/16" | 0000000 | 00000 |
| 3/8" | 0.375" | 3 1/8" | 2" | Round | 11/16" | 0000000 | 00000 |
| 7/16" | 0.4375" | 3 1/8" | 2" | Round | 11/16" | 0000000 | 00000 |
| 1/2" | 0.5" | 3 1/8" | 2" | Round | 11/16" | 0000000 | 00000 |