For System of Measurement For System of Measurement |
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For Drill Bit Size For Drill Bit Size |
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DFARS (Defense Acquisition Regulations Supplement) DFARS (Defense AcquisitionRegulations Supplement)  |
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Drill Bit Size Identifiers
Inch
Letter
Metric
Wire Gauge
Measure drill bit sizes with these identifiers.
Drill/tap identifier includes a tap size conversion chart.
| For System of Measurement | For Use With | For Drill Bit Size | Wd. | Ht. | Thick. | Material | Color | Mounting Hole Dia. | Each | |
| Inch | Drills | 1/16", 5/64", 3/32", 7/64", 1/8", 9/64", 5/32", 11/64", 3/16", 13/64", 7/32", 15/64", 1/4", 17/64", 9/32", 19/64", 5/16", 21/64", 11/32", 23/64", 3/8", 25/64", 13/32", 27/64", 7/16", 29/64", 15/32", 31/64", 1/2" | 2 1/2" | 6 1/2" | 5/64" | Steel | Silver | 1/8" | 0000000 | 000000 |
| Letter | Drills | A, B, C, D, E, F, G, H, I, J, K, L, M, N, O, P, Q, R, S, T, U, V, W, X, Y, Z | 2 1/2" | 6 1/2" | 5/64" | Steel | Silver | 1/8" | 0000000 | 00000 |
| Metric | Drills | 1.5 mm, 2.0 mm, 2.25 mm, 2.5 mm, 2.75 mm, 3.0 mm, 3.25 mm, 3.5 mm, 3.75 mm, 4.0 mm, 4.25 mm, 4.5 mm, 4.75 mm, 5.0 mm, 5.5 mm, 6.0 mm, 6.5 mm, 7.0 mm, 7.5 mm, 8.0 mm, 8.5 mm, 9.0 mm, 9.5 mm, 10.0 mm, 10.5 mm, 11.0 mm, 11.5 mm, 12.0 mm, 12.5 mm, 5.25 mm | 2 1/2" | 6 1/2" | 5/64" | Steel | Silver | 1/8" | 0000000 | 00000 |
| Wire Gauge | Drills | 80, 79, 78, 77, 76, 75, 74, 73, 72, 71, 70, 69, 68, 67, 66, 65, 64, 63, 62, 61 | 1" | 3" | 5/64" | Steel | Silver | 1/8" | 0000000 | 00000 |
| Wire Gauge | Drills/Taps | 60, 59, 58, 57, 56, 55, 54, 53, 52, 51, 50, 49, 48, 47, 46, 45, 44, 43, 42, 41, 40, 39, 38, 37, 36, 35, 34, 33, 32, 31, 30, 29, 28, 27, 26, 25, 24, 23, 22, 21, 20, 19, 18, 17, 16, 15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1 | 2 1/2" | 6 1/2" | 5/64" | Steel | Silver | 1/8" | 0000000 | 00000 |