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 | Number Of Flutes | Overall Length | Pilot Hole Diameter | Shank Diameter | EDP | Price | Order | 1.9375 | 1 15/16 | 0.489 | 4 | 8 1/8 | 7/16 | 1 1/2 | 56427 | $379.50 | 2.0000 | 2 | 0.551 | 4 | 8 3/8 | 1/2 | 1 1/2 | 56428 | $379.50 | 1.8125 | 1 13/16 | 0.489 | 4 | 8 1/8 | 7/16 | 1 1/2 | 56425 | $347.25 | 1.8750 | 1 7/8 | 0.489 | 4 | 8 1/8 | 7/16 | 1 1/2 | 56426 | $347.25 | 1.6875 | 1 11/16 | 0.489 | 4 | 8 1/8 | 7/16 | 1 1/4 | 56429 | $293.40 | 1.7500 | 1 3/4 | 0.489 | 4 | 8 1/8 | 7/16 | 1 1/4 | 56424 | $293.40 | 1.5625 | 1 9/16 | 0.489 | 4 | 8 1/8 | 7/16 | 1 1/4 | 56422 | $240.15 | 1.6250 | 1 5/8 | 0.489 | 4 | 8 1/8 | 7/16 | 1 1/4 | 56423 | $245.15 | 1.4375 | 1 7/16 | 0.426 | 4 | 7 7/8 | 3/8 | 1 1/4 | 56420 | $201.80 | 1.5000 | 1 1/2 | 0.426 | 4 | 7 7/8 | 3/8 | 1 1/4 | 56421 | $233.30 | 1.3125 | 1 5/16 | 0.426 | 4 | 6 5/8 | 3/8 | 1 | 56418 | $174.95 | 1.3750 | 1 3/8 | 0.426 | 4 | 6 5/8 | 3/8 | 1 | 56419 | $184.15 | 1.1875 | 1 3/16 | 0.353 | 3 | 6 3/8 | 5/16 | 1 | 59816 | $145.55 | 1.2500 | 1 1/4 | 0.426 | 4 | 6 5/8 | 3/8 | 1 | 56417 | $162.10 | 1.1250 | 1 1/8 | 0.353 | 3 | 6 3/8 | 5/16 | 1 | 59815 | $139.45 | 1.1875 | 1 3/16 | 0.353 | 4 | 6 3/8 | 5/16 | 1 | 56416 | $145.55 | 1.0625 | 1 1/16 | 0.353 | 3 | 6 3/8 | 5/16 | 3/4 | 59814 | $135.85 | 1.1250 | 1 1/8 | 0.353 | 4 | 6 3/8 | 5/16 | 1 | 56415 | $139.45 | 1.0000 | 1 | 0.353 | 3 | 6 3/8 | 5/16 | 3/4 | 59813 | $134.45 | 1.0625 | 1 1/16 | 0.353 | 4 | 6 3/8 | 5/16 | 3/4 | 56414 | $135.85 | 0.9688 | 31/32 | 0.353 | 3 | 6 3/8 | 5/16 | 3/4 | 5799688 | $147.90 | 1.0000 | 1 | 0.353 | 4 | 6 3/8 | 5/16 | 3/4 | 56413 | $134.45 | 0.9375 | 15/16 | 0.29 | 3 | 6 1/8 | 1/4 | 3/4 | 59812 | $130.75 | 0.9688 | 31/32 | 0.353 | 4 | 6 3/8 | 5/16 | 3/4 | 5779688 | $147.90 | 0.9063 | 29/32 | 0.29 | 3 | 6 1/8 | 1/4 | 3/4 | 5799062 | $143.70 | 0.9375 | 15/16 | 0.29 | 4 | 6 1/8 | 1/4 | 3/4 | 56412 | $130.75 | 0.8750 | 7/8 | 0.29 | 3 | 5 3/8 | 1/4 | 3/4 | 59811 | $128.10 | 0.9063 | 29/32 | 0.29 | 4 | 6 1/8 | 1/4 | 3/4 | 5779062 | $143.70 | 0.8438 | 27/32 | 0.29 | 3 | 5 3/8 | 1/4 | 3/4 | 5798438 | $140.85 | 0.8750 | 7/8 | 0.29 | 4 | 5 3/8 | 1/4 | 3/4 | 56411 | $128.10 | 0.8125 | 13/16 | 0.29 | 3 | 5 3/8 | 1/4 | 5/8 | 59810 | $120.80 | 0.8438 | 27/32 | 0.29 | 4 | 5 3/8 | 1/4 | 3/4 | 5778438 | $140.85 | 0.7813 | 25/32 | 0.29 | 3 | 5 3/8 | 1/4 | 5/8 | 5797812 | $133.05 | 0.8125 | 13/16 | 0.29 | 4 | 5 3/8 | 1/4 | 5/8 | 56410 | $120.80 | 0.7500 | 3/4 | 0.29 | 3 | 5 3/8 | 1/4 | 1/2 | 59809 | $118.30 | 0.7813 | 25/32 | 0.29 | 4 | 5 3/8 | 1/4 | 5/8 | 5777812 | $133.05 | 0.7188 | 23/32 | 0.29 | 3 | 5 3/8 | 1/4 | 1/2 | 5797188 | $130.25 | 0.7500 | 3/4 | 0.29 | 4 | 5 3/8 | 1/4 | 1/2 | 56409 | $118.30 | 0.6875 | 11/16 | 0.228 | 3 | 5 1/8 | 3/16 | 1/2 | 59808 | $115.70 | 0.7188 | 23/32 | 0.29 | 4 | 5 3/8 | 1/4 | 1/2 | 5777188 | $130.25 | 0.6563 | 21/32 | 0.228 | 3 | 5 1/8 | 3/16 | 1/2 | 5796562 | $127.20 | 0.6875 | 11/16 | 0.228 | 4 | 5 1/8 | 3/16 | 1/2 | 56408 | $115.70 | 0.6250 | 5/8 | 0.228 | 3 | 5 1/8 | 3/16 | 1/2 | 59807 | $109.30 | 0.6563 | 21/32 | 0.228 | 4 | 5 1/8 | 3/16 | 1/2 | 5776562 | $127.20 | 0.5938 | 19/32 | 0.228 | 3 | 5 1/8 | 3/16 | 1/2 | 5795938 | $120.25 | 0.6250 | 5/8 | 0.228 | 4 | 5 1/8 | 3/16 | 1/2 | 56407 | $109.30 | 0.5625 | 9/16 | 0.228 | 3 | 4 5/16 | 3/16 | 1/2 | 59806 | $108.20 | 0.5938 | 19/32 | 0.228 | 4 | 5 1/8 | 3/16 | 1/2 | 5775938 | $120.25 | 0.5313 | 17/32 | 0.228 | 3 | 4 5/16 | 3/16 | 1/2 | 5795312 | $118.95 | 0.5625 | 9/16 | 0.228 | 4 | 4 5/16 | 3/16 | 1/2 | 56406 | $108.20 | 0.5000 | 1/2 | 0.228 | 3 | 4 5/16 | 3/16 | 7/16 | 59805 | $105.15 | 0.5313 | 17/32 | 0.228 | 4 | 4 5/16 | 3/16 | 1/2 | 5775312 | $118.95 | 0.4688 | 15/32 | 0.228 | 3 | 4 5/16 | 3/16 | 7/16 | 5794688 | $115.60 | 0.5000 | 1/2 | 0.228 | 4 | 4 5/16 | 3/16 | 7/16 | 56405 | $105.15 | 0.4063 | 13/32 | 0.182 | 3 | 4 1/16 | 5/32 | 3/8 | 5794062 | $104.05 | 0.4375 | 7/16 | 0.182 | 3 | 4 1/16 | 5/32 | 3/8 | 56404 | $94.70 | 0.3438 | 11/32 | 0.114 | 3 | 3 13/16 | 3/32 | 5/16 | 5793438 | $110.20 | 0.3750 | 3/8 | 0.182 | 3 | 4 1/16 | 5/32 | 5/16 | 56403 | $92.30 | 0.2813 | 9/32 | 0.114 | 3 | 3 13/16 | 3/32 | 17/64 | 5792812 | $102.00 | 0.3125 | 5/16 | 0.114 | 3 | 3 13/16 | 3/32 | 19/64 | 56402 | $87.05 | 0.2500 | 1/4 | 0.114 | 3 | 3 13/16 | 3/32 | 15/64 | 56401 | $83.45 |
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