Counterbores are used to enlarge a preformed hole when a flat bottom is required or to spotface when a machine finish is required. The counterbore is an end cutting tool which may utilize a pilot to align the enlarged hole being machined with the preformed hole. Capscrew counterbores have non-removable pilots.
| Decimal Diameter | Fractional Diameter | Minimum Cut Diameter | Morse Taper | Number Of Flutes | Overall Length | Pilot Hole Diameter | EDP | Price | Order | 1.9375 | 1 15/16 | 0.489 | 4 | 4 | 8 1/8 | 7/16 | 47441 | $491.75 | 2.0000 | 2 | 0.551 | 4 | 4 | 8 3/8 | 1/2 | 47437 | $491.75 | 1.8125 | 1 13/16 | 0.489 | 4 | 4 | 8 1/8 | 7/16 | 47439 | $450.10 | 1.8750 | 1 7/8 | 0.489 | 4 | 4 | 8 1/8 | 7/16 | 47440 | $450.10 | 1.6875 | 1 11/16 | 0.489 | 4 | 4 | 8 1/8 | 7/16 | 47438 | $380.25 | 1.7500 | 1 3/4 | 0.489 | 4 | 4 | 8 1/8 | 7/16 | 47436 | $380.25 | 1.5625 | 1 9/16 | 0.489 | 4 | 4 | 8 1/8 | 7/16 | 47434 | $312.20 | 1.6250 | 1 5/8 | 0.489 | 4 | 4 | 8 1/8 | 7/16 | 47435 | $317.80 | 1.4375 | 1 7/16 | 0.426 | 4 | 4 | 7 7/8 | 3/8 | 47432 | $252.50 | 1.5000 | 1 1/2 | 0.426 | 4 | 4 | 7 7/8 | 3/8 | 47433 | $290.55 | 1.3125 | 1 5/16 | 0.426 | 3 | 4 | 6 5/8 | 3/8 | 47430 | $216.65 | 1.3750 | 1 3/8 | 0.426 | 3 | 4 | 6 5/8 | 3/8 | 47431 | $227.05 | 1.1875 | 1 3/16 | 0.353 | 3 | 3 | 6 3/8 | 5/16 | 47427 | $181.80 | 1.2500 | 1 1/4 | 0.426 | 3 | 4 | 6 5/8 | 3/8 | 47429 | $202.20 | 1.0625 | 1 1/16 | 0.353 | 3 | 3 | 6 3/8 | 5/16 | 47423 | $170.50 | 1.1250 | 1 1/8 | 0.353 | 3 | 3 | 6 3/8 | 5/16 | 47425 | $175.80 | 0.9688 | 31/32 | 0.353 | 3 | 3 | 6 3/8 | 5/16 | 4749688 | $178.30 | 1.0000 | 1 | 0.353 | 3 | 3 | 6 3/8 | 5/16 | 47421 | $168.25 | 0.9063 | 29/32 | 0.29 | 3 | 3 | 6 1/8 | 1/4 | 4749062 | $174.30 | 0.9375 | 15/16 | 0.29 | 3 | 3 | 6 1/8 | 1/4 | 47419 | $158.40 | 0.8438 | 27/32 | 0.29 | 2 | 3 | 5 3/8 | 1/4 | 4748438 | $169.65 | 0.8750 | 7/8 | 0.29 | 2 | 3 | 5 3/8 | 1/4 | 47417 | $154.25 | 0.7813 | 25/32 | 0.29 | 2 | 3 | 5 3/8 | 1/4 | 4747812 | $161.40 | 0.8125 | 13/16 | 0.29 | 2 | 3 | 5 3/8 | 1/4 | 47415 | $146.80 | 0.7188 | 23/32 | 0.29 | 2 | 3 | 5 3/8 | 1/4 | 4747188 | $158.70 | 0.7500 | 3/4 | 0.29 | 2 | 3 | 5 3/8 | 1/4 | 47413 | $144.25 | 0.6563 | 21/32 | 0.228 | 2 | 3 | 5 1/8 | 3/16 | 4746562 | $156.10 | 0.6875 | 11/16 | 0.228 | 2 | 3 | 5 1/8 | 3/16 | 47411 | $141.80 | 0.5938 | 19/32 | 0.228 | 2 | 3 | 5 1/8 | 3/16 | 4745938 | $147.90 | 0.6250 | 5/8 | 0.228 | 2 | 3 | 5 1/8 | 3/16 | 47409 | $134.40 | 0.5313 | 17/32 | 0.228 | 1 | 3 | 4 5/16 | 3/16 | 4745312 | $144.00 | 0.5625 | 9/16 | 0.228 | 1 | 3 | 4 5/16 | 3/16 | 47407 | $130.90 | 0.4688 | 15/32 | 0.228 | 1 | 3 | 4 5/16 | 3/16 | 4744688 | $146.70 | 0.5000 | 1/2 | 0.228 | 1 | 3 | 4 5/16 | 3/16 | 47405 | $133.35 | 0.4063 | 13/32 | 0.182 | 1 | 3 | 4 1/16 | 5/32 | 4744062 | $132.90 | 0.4375 | 7/16 | 0.182 | 1 | 3 | 4 1/16 | 5/32 | 47404 | $120.80 | 0.3438 | 11/32 | 0.114 | 1 | 3 | 3 13/16 | 3/32 | 4743438 | $140.45 | 0.3750 | 3/8 | 0.182 | 1 | 3 | 4 1/16 | 5/32 | 47403 | $117.65 | 0.2813 | 9/32 | 0.114 | 1 | 3 | 3 13/16 | 3/32 | 4742812 | $133.50 | 0.3125 | 5/16 | 0.114 | 1 | 3 | 3 13/16 | 3/32 | 47402 | $113.95 | 0.2500 | 1/4 | 0.114 | 1 | 3 | 3 13/16 | 3/32 | 47401 | $110.85 |
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