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 | 2.0000 | 2 | 0.551 | 4 | 4 | 8 3/8 | 1/2 | 56478 | $491.75 | 1.8750 | 1 7/8 | 0.489 | 4 | 4 | 8 1/8 | 7/16 | 56476 | $450.10 | 1.9375 | 1 15/16 | 0.489 | 4 | 4 | 8 1/8 | 7/16 | 56477 | $491.75 | 1.7500 | 1 3/4 | 0.489 | 4 | 4 | 8 1/8 | 7/16 | 56474 | $380.25 | 1.8125 | 1 13/16 | 0.489 | 4 | 4 | 8 1/8 | 7/16 | 56475 | $450.10 | 1.6250 | 1 5/8 | 0.489 | 4 | 4 | 8 1/8 | 7/16 | 56473 | $317.80 | 1.6875 | 1 11/16 | 0.489 | 4 | 4 | 8 1/8 | 7/16 | 56479 | $380.25 | 1.5000 | 1 1/2 | 0.426 | 4 | 4 | 7 7/8 | 3/8 | 56471 | $290.55 | 1.5625 | 1 9/16 | 0.489 | 4 | 4 | 8 1/8 | 7/16 | 56472 | $312.20 | 1.3750 | 1 3/8 | 0.426 | 3 | 4 | 6 5/8 | 3/8 | 56469 | $235.65 | 1.4375 | 1 7/16 | 0.426 | 4 | 4 | 7 7/8 | 3/8 | 56470 | $262.15 | 1.2500 | 1 1/4 | 0.426 | 3 | 4 | 6 5/8 | 3/8 | 56467 | $209.80 | 1.3125 | 1 5/16 | 0.426 | 3 | 4 | 6 5/8 | 3/8 | 56468 | $224.80 | 1.1875 | 1 3/16 | 0.353 | 3 | 4 | 6 3/8 | 5/16 | 56466 | $188.65 | 1.1875 | 1 3/16 | 0.353 | 3 | 3 | 6 3/8 | 5/16 | 59866 | $188.65 | 1.1250 | 1 1/8 | 0.353 | 3 | 4 | 6 3/8 | 5/16 | 56465 | $182.50 | 1.1250 | 1 1/8 | 0.353 | 3 | 3 | 6 3/8 | 5/16 | 59865 | $182.50 | 1.0625 | 1 1/16 | 0.353 | 3 | 4 | 6 3/8 | 5/16 | 56464 | $176.90 | 1.0625 | 1 1/16 | 0.353 | 3 | 3 | 6 3/8 | 5/16 | 59864 | $176.90 | 1.0000 | 1 | 0.353 | 3 | 4 | 6 3/8 | 5/16 | 56463 | $174.60 | 1.0000 | 1 | 0.353 | 3 | 3 | 6 3/8 | 5/16 | 59863 | $174.60 | 0.9688 | 31/32 | 0.353 | 3 | 4 | 6 3/8 | 5/16 | 5649688 | $185.10 | 0.9688 | 31/32 | 0.353 | 3 | 3 | 6 3/8 | 5/16 | 5989688 | $185.10 | 0.9375 | 15/16 | 0.29 | 3 | 4 | 6 1/8 | 1/4 | 56462 | $164.40 | 0.9375 | 15/16 | 0.29 | 3 | 3 | 6 1/8 | 1/4 | 59862 | $164.40 | 0.9063 | 29/32 | 0.29 | 3 | 4 | 6 1/8 | 1/4 | 5649062 | $180.90 | 0.9063 | 29/32 | 0.29 | 3 | 3 | 6 1/8 | 1/4 | 5989062 | $180.90 | 0.8750 | 7/8 | 0.29 | 2 | 4 | 5 3/8 | 1/4 | 56461 | $160.10 | 0.8750 | 7/8 | 0.29 | 2 | 3 | 5 3/8 | 1/4 | 59861 | $160.10 | 0.8438 | 27/32 | 0.29 | 2 | 4 | 5 3/8 | 1/4 | 5648438 | $176.00 | 0.8438 | 27/32 | 0.29 | 2 | 3 | 5 3/8 | 1/4 | 5988438 | $176.00 | 0.8125 | 13/16 | 0.29 | 2 | 4 | 5 3/8 | 1/4 | 56460 | $152.25 | 0.8125 | 13/16 | 0.29 | 2 | 3 | 5 3/8 | 1/4 | 59860 | $152.25 | 0.7813 | 25/32 | 0.29 | 2 | 4 | 5 3/8 | 1/4 | 5647812 | $167.55 | 0.7813 | 25/32 | 0.29 | 2 | 3 | 5 3/8 | 1/4 | 5987812 | $167.55 | 0.7500 | 3/4 | 0.29 | 2 | 4 | 5 3/8 | 1/4 | 56459 | $149.75 | 0.7500 | 3/4 | 0.29 | 2 | 3 | 5 3/8 | 1/4 | 59859 | $149.75 | 0.7188 | 23/32 | 0.29 | 2 | 4 | 5 3/8 | 1/4 | 5647188 | $164.70 | 0.7188 | 23/32 | 0.29 | 2 | 3 | 5 3/8 | 1/4 | 5987188 | $164.70 | 0.6875 | 11/16 | 0.228 | 2 | 4 | 5 1/8 | 3/16 | 56458 | $147.10 | 0.6875 | 11/16 | 0.228 | 2 | 3 | 5 1/8 | 3/16 | 59858 | $147.10 | 0.6563 | 21/32 | 0.228 | 2 | 4 | 5 1/8 | 3/16 | 5646562 | $162.00 | 0.6563 | 21/32 | 0.228 | 2 | 3 | 5 1/8 | 3/16 | 5986562 | $162.00 | 0.6250 | 5/8 | 0.228 | 2 | 4 | 5 1/8 | 3/16 | 56457 | $139.50 | 0.6250 | 5/8 | 0.228 | 2 | 3 | 5 1/8 | 3/16 | 59857 | $139.50 | 0.5938 | 19/32 | 0.228 | 2 | 4 | 5 1/8 | 3/16 | 5645938 | $153.45 | 0.5938 | 19/32 | 0.228 | 2 | 3 | 5 1/8 | 3/16 | 5985938 | $153.45 | 0.5625 | 9/16 | 0.228 | 1 | 4 | 4 5/16 | 3/16 | 56456 | $135.85 | 0.5625 | 9/16 | 0.228 | 1 | 3 | 4 5/16 | 3/16 | 59856 | $135.85 | 0.5313 | 17/32 | 0.228 | 1 | 4 | 4 5/16 | 3/16 | 5645312 | $149.35 | 0.5313 | 17/32 | 0.228 | 1 | 3 | 4 5/16 | 3/16 | 5985312 | $149.35 | 0.5000 | 1/2 | 0.228 | 1 | 4 | 4 5/16 | 3/16 | 56455 | $133.35 | 0.5000 | 1/2 | 0.228 | 1 | 3 | 4 5/16 | 3/16 | 59855 | $133.35 | 0.4375 | 7/16 | 0.182 | 1 | 3 | 4 1/16 | 5/32 | 56454 | $120.80 | 0.4688 | 15/32 | 0.228 | 1 | 3 | 4 5/16 | 3/16 | 5984688 | $146.70 | 0.3750 | 3/8 | 0.182 | 1 | 3 | 4 1/16 | 5/32 | 56453 | $117.65 | 0.4063 | 13/32 | 0.182 | 1 | 3 | 4 1/16 | 5/32 | 5984062 | $132.90 | 0.3125 | 5/16 | 0.114 | 1 | 3 | 3 13/16 | 3/32 | 56452 | $113.95 | 0.3438 | 11/32 | 0.114 | 1 | 3 | 3 13/16 | 3/32 | 5983438 | $140.45 | 0.2500 | 1/4 | 0.114 | 1 | 3 | 3 13/16 | 3/32 | 56451 | $110.85 | 0.2813 | 9/32 | 0.114 | 1 | 3 | 3 13/16 | 3/32 | 5982812 | $133.50 |
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