Interchangeable pilot counterbore sets
American standard or DIN standard.
Pilots of different diameters can be used with each counterbore. Used in spot facing and counterboring operations with same pilot.
| Cutter Dia. | Overall Length | Shank Dia. | Shank Length | No. of Flutes | Pilot Hole Dia. |
| 3/16" | 3" | 15/64" | 2-3/8" | 3 | 3/32" |
| 7/32" | 3" | 15/64" | 2-3/8" | 3 | 3/32" |
| 1/4" | 3-13/16" | 15/64" | 3-1/16" | 3 | 3/32" |
| 9/32" | 3-13/16" | 17/64" | 3-1/16" | 3 | 3/32" |
| 5/16" | 3-13/16" | 19/64" | 3-1/16" | 3 | 3/32" |
| 11/32" | 3-13/16" | 5/16" | 3-1/16" | 3 | 3/32" |
| 3/8" | 4-1/16" | 5/16" | 3-1/16" | 3 | 5/32" |
| 13/32" | 4-1/16" | 3/8" | 3-1/16" | 3 | 5/32" |
| 7/16" | 4-1/16" | 3/8" | 3-1/16" | 3 | 5/32" |
| 15/32" | 4-5/16" | 7/16" | 3-1/16" | 3 | 3/16" |
| 1/2" | 4-5/16" | 7/16" | 3-1/16" | 3 | 3/16" |
| 17/32" | 4-5/16" | 1/2" | 3-1/16" | 3 | 3/16" |
| 9/16" | 4-5/16" | 1/2" | 3-1/16" | 3 | 3/16" |
| 19/32" | 5-1/8" | 1/2" | 3-7/8" | 3 | 3/16" |
| 5/8" | 5-1/8" | 1/2" | 3-7/8" | 3 | 3/16" |
| 21/32" | 5-1/8" | 1/2" | 3-7/8" | 3 | 3/16" |
| 11/16" | 5-1/8" | 1/2" | 3-7/8" | 3 | 3/16" |
| 23/32" | 5-3/8" | 1/2" | 3-7/8" | 3 | 1/4" |
| 3/4" | 5-3/8" | 1/2" | 3-7/8" | 3 | 1/4" |
| 25/32" | 5-3/8" | 5/8" | 3-7/8" | 3 | 1/4" |
| 13/16" | 5-3/8" | 5/8" | 3-7/8" | 3 | 1/4" |
| 27/32" | 5-3/8" | 3/4" | 3-7/8" | 3 | 1/4" |
| 7/8" | 5-3/8" | 3/4" | 3-7/8" | 3 | 1/4" |
| 29/32" | 6-1/8" | 3/4" | 4-5/8" | 3 | 1/4" |
| 15/16" | 6-1/8" | 3/4" | 4-5/8" | 3 | 1/4" |
| 31/32" | 6-3/8" | 3/4" | 4-5/8" | 3 | 5/16" |
| 1" | 6-3/8" | 3/4" | 4-5/8" | 3 | 5/16" |
| 1-1/16" | 6-3/8" | 3/4" | 4-5/8" | 3 | 5/16" |
| 1-1/8" | 6-3/8" | 1" | 4-5/8" | 3 | 5/16" |
| 1-3/16" | 6-3/8" | 1" | 4-5/8" | 3 | 5/16" |
| 1-1/4" | 6-5/8" | 1" | 4-5/8" | 5 | 3/8" |
| 1-/16" | 6-5/8" | 1" | 4-5/8" | 5 | 3/8" |
| 1-3/8" | 6-5/8" | 1" | 4-5/8" | 5 | 3/8" |
| 1-7/16" | 7-7/8" | 1-1/4" | 5-7/8" | 5 | 3/8" |
| 1-1/2" | 7-7/8" | 1-1/4" | 5-7/8" | 5 | 3/8" |
| 1-9/16" | 8-1/8" | 1-1/4" | 5-7/8" | 5 | 7/16" |
| 1-5/8" | 8-1/8" | 1-1/4" | 5-7/8" | 5 | 7/16" |
| 1-11/16" | 8-1/8" | 1-1/4" | 5-7/8" | 5 | 7/16" |
| 1-3/4" | 8-1/8" | 1-1/4" | 5-7/8" | 5 | 7/16" |
| 1-13/16" | 8-1/8" | 1-1/2" | 5-7/8" | 5 | 7/16" |
| 1-7/8" | 8-1/8" | 1-1/2" | 5-7/8" | 5 | 7/16" |
| 1-15/16" | 8-1/8" | 1-1/2" | 5-7/8" | 5 | 7/16" |
| 2" | 8-3/8" | 1-1/2" | 5-7/8" | 5 | 1/2" |
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