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 | Small Shank Diameter | EDP | Price | Order | 1.9375 | 1 15/16 | 0.343 | 3 | 3 1/16 | 5/16 | 1/2 | 52262 | $237.70 | 2.0000 | 2 | 0.343 | 3 | 3 1/16 | 5/16 | 1/2 | 52264 | $295.75 | 1.8125 | 1 13/16 | 0.343 | 3 | 3 1/16 | 5/16 | 1/2 | 52258 | $213.90 | 1.8750 | 1 7/8 | 0.343 | 3 | 3 1/16 | 5/16 | 1/2 | 52260 | $215.40 | 1.6875 | 1 11/16 | 0.343 | 3 | 3 1/16 | 5/16 | 1/2 | 52254 | $208.10 | 1.7500 | 1 3/4 | 0.343 | 3 | 3 1/16 | 5/16 | 1/2 | 52256 | $211.35 | 1.5625 | 1 9/16 | 0.343 | 3 | 3 1/16 | 5/16 | 1/2 | 52250 | $202.75 | 1.6250 | 1 5/8 | 0.343 | 3 | 3 1/16 | 5/16 | 1/2 | 52252 | $205.40 | 1.4375 | 1 7/16 | 0.281 | 3 | 2 3/4 | 1/4 | 3/8 | 52246 | $173.10 | 1.5000 | 1 1/2 | 0.281 | 3 | 2 3/4 | 1/4 | 3/8 | 52248 | $182.30 | 1.3125 | 1 5/16 | 0.281 | 3 | 2 3/4 | 1/4 | 3/8 | 52242 | $169.15 | 1.3750 | 1 3/8 | 0.281 | 3 | 2 3/4 | 1/4 | 3/8 | 52244 | $171.05 | 1.1875 | 1 3/16 | 0.219 | 3 | 2 3/4 | 3/16 | 3/8 | 52238 | $163.05 | 1.2500 | 1 1/4 | 0.281 | 3 | 2 3/4 | 1/4 | 3/8 | 52240 | $166.05 | 1.0625 | 1 1/16 | 0.219 | 3 | 2 3/4 | 3/16 | 3/8 | 52234 | $150.90 | 1.1250 | 1 1/8 | 0.219 | 3 | 2 3/4 | 3/16 | 3/8 | 52236 | $160.95 | 0.9688 | 31/32 | 0.219 | 3 | 2 3/4 | 3/16 | 1/4 | 52231 | $117.85 | 1.0000 | 1 | 0.219 | 3 | 2 3/4 | 3/16 | 1/4 | 52232 | $118.20 | 0.9063 | 29/32 | 0.219 | 3 | 2 3/4 | 3/16 | 1/4 | 52229 | $115.90 | 0.9375 | 15/16 | 0.219 | 3 | 2 3/4 | 3/16 | 1/4 | 52230 | $117.00 | 0.8438 | 27/32 | 0.219 | 3 | 2 3/4 | 3/16 | 1/4 | 52227 | $114.10 | 0.8750 | 7/8 | 0.219 | 3 | 2 3/4 | 3/16 | 1/4 | 52228 | $115.20 | 0.7813 | 25/32 | 0.219 | 3 | 2 3/4 | 3/16 | 1/4 | 52225 | $112.25 | 0.8125 | 13/16 | 0.219 | 3 | 2 3/4 | 3/16 | 1/4 | 52226 | $113.25 | 0.7188 | 23/32 | 0.219 | 3 | 2 3/4 | 3/16 | 1/4 | 52223 | $110.45 | 0.7500 | 3/4 | 0.219 | 3 | 2 3/4 | 3/16 | 1/4 | 52224 | $111.85 | 0.6563 | 21/32 | 0.219 | 3 | 2 3/4 | 3/16 | 1/4 | 52221 | $101.70 | 0.6875 | 11/16 | 0.219 | 3 | 2 3/4 | 3/16 | 1/4 | 52222 | $106.85 | 0.5938 | 19/32 | 0.156 | 3 | 2 3/4 | 1/8 | 1/4 | 52219 | $90.50 | 0.6250 | 5/8 | 0.156 | 3 | 2 3/4 | 1/8 | 1/4 | 52220 | $91.55 | 0.5313 | 17/32 | 0.156 | 3 | 2 3/4 | 1/8 | 1/4 | 52217 | $89.70 | 0.5625 | 9/16 | 0.156 | 3 | 2 3/4 | 1/8 | 1/4 | 52218 | $90.05 | 0.4688 | 15/32 | 0.156 | 3 | 2 3/4 | 1/8 | 1/4 | 52215 | $88.15 | 0.5000 | 1/2 | 0.156 | 3 | 2 3/4 | 1/8 | 1/4 | 52216 | $89.20 | 0.4063 | 13/32 | 0.156 | 3 | 2 3/4 | 1/8 | 1/4 | 52213 | $80.40 | 0.4375 | 7/16 | 0.156 | 3 | 2 3/4 | 1/8 | 1/4 | 52214 | $86.65 | 0.3438 | 11/32 | 0.125 | 3 | 2 3/8 | 3/32 | 1/4 | 52211 | $70.50 | 0.3750 | 3/8 | 0.125 | 3 | 2 3/8 | 3/32 | 1/4 | 52212 | $70.75 | 0.2813 | 9/32 | 0.125 | 3 | 2 3/8 | 3/32 | 1/4 | 52209 | $67.40 | 0.3125 | 5/16 | 0.125 | 3 | 2 3/8 | 3/32 | 1/4 | 52210 | $69.15 | 0.2500 | 1/4 | 0.125 | 3 | 2 3/8 | 3/32 | 1/4 | 52208 | $67.30 |
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