Howmet Fastening Systems
Howmet Fastening Systems
Phone: Sales +1 800 992 4444
Technical Support +1 310 784 6409
Email: HFSTechSupport@howmet.com
Website: www.hfs.howmet.com
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Counter Bore Tool
Unit of Measure
1 

Item #

Material Type

Size

A - Dia ±.0005

B - Dia +.0010 -.0000

C ±.0300

RC12-128 N/A High Speed Steel N/A 12 N/A 0.128 in N/A 0.187 in N/A 2.380 in
RC16-128 N/A High Speed Steel N/A 16 N/A 0.128 in N/A 0.250 in N/A 2.380 in
RC16-157 N/A High Speed Steel N/A 16 N/A 0.157 in N/A 0.250 in N/A 2.380 in
RC18-157 N/A High Speed Steel N/A 18 N/A 0.157 in N/A 0.281 in N/A 2.380 in
RC18-185 N/A High Speed Steel N/A 18 N/A 0.185 in N/A 0.281 in N/A 2.380 in
RC21-213 N/A High Speed Steel N/A 21 N/A 0.213 in N/A 0.328 in N/A 2.560 in
RC23-185 N/A High Speed Steel N/A 23 N/A 0.185 in N/A 0.359 in N/A 2.690 in
RC23-242 N/A High Speed Steel N/A 23 N/A 0.242 in N/A 0.359 in N/A 2.690 in
RC24-190 N/A High Speed Steel N/A 24 N/A 0.190 in N/A 0.375 in N/A 2.690 in
RC24-257 N/A High Speed Steel N/A 24 N/A 0.257 in N/A 0.375 in N/A 2.690 in
RC27-213 N/A High Speed Steel N/A 27 N/A 0.213 in N/A 0.421 in N/A 2.880 in
RC27-281 N/A High Speed Steel N/A 27 N/A 0.281 in N/A 0.421 in N/A 2.880 in
RC28-190 N/A High Speed Steel N/A 28 N/A 0.190 in N/A 0.437 in N/A 2.880 in
RC28-250 N/A High Speed Steel N/A 28 N/A 0.250 in N/A 0.437 in N/A 2.880 in
RC28-312 N/A High Speed Steel N/A 28 N/A 0.312 in N/A 0.437 in N/A 2.880 in
RC31-242 N/A High Speed Steel N/A 31 N/A 0.242 in N/A 0.484 in N/A 3.190 in
RC31-359 N/A High Speed Steel N/A 31 N/A 0.359 in N/A 0.484 in N/A 3.190 in
RC33-250 N/A High Speed Steel N/A 33 N/A 0.250 in N/A 0.515 in N/A 3.440 in
RC33-281 N/A High Speed Steel N/A 33 N/A 0.281 in N/A 0.515 in N/A 3.440 in
RC33-312 N/A High Speed Steel N/A 33 N/A 0.312 in N/A 0.515 in N/A 3.440 in
RC33-368 N/A High Speed Steel N/A 33 N/A 0.368 in N/A 0.515 in N/A 3.440 in
RC33-386 N/A High Speed Steel N/A 33 N/A 0.386 in N/A 0.515 in N/A 3.440 in
RC38-312 N/A High Speed Steel N/A 38 N/A 0.312 in N/A 0.593 in N/A 3.560 in
RC38-375 N/A High Speed Steel N/A 38 N/A 0.375 in N/A 0.593 in N/A 3.560 in
RC38-422 N/A High Speed Steel N/A 38 N/A 0.422 in N/A 0.593 in N/A 3.560 in
RC38-453 N/A High Speed Steel N/A 38 N/A 0.453 in N/A 0.593 in N/A 3.560 in
RC43-375 N/A High Speed Steel N/A 43 N/A 0.375 in N/A 0.671 in N/A 3.750 in
RC43-437 N/A High Speed Steel N/A 43 N/A 0.437 in N/A 0.671 in N/A 3.750 in
RC47-359 N/A High Speed Steel N/A 47 N/A 0.359 in N/A 0.734 in N/A 3.750 in
RC47-422 N/A High Speed Steel N/A 47 N/A 0.422 in N/A 0.734 in N/A 3.750 in
RC47-437 N/A High Speed Steel N/A 47 N/A 0.437 in N/A 0.734 in N/A 3.750 in
RC47-506 N/A High Speed Steel N/A 47 N/A 0.506 in N/A 0.734 in N/A 3.750 in
RC47-535 N/A High Speed Steel N/A 47 N/A 0.535 in N/A 0.734 in N/A 3.750 in
RC47-569 N/A High Speed Steel N/A 47 N/A 0.569 in N/A 0.734 in N/A 3.750 in
RC51-569 N/A High Speed Steel N/A 51 N/A 0.569 in N/A 0.797 in N/A 4.120 in
RC56-506 N/A High Speed Steel N/A 56 N/A 0.506 in N/A 0.875 in N/A 4.120 in
RC56-569 N/A High Speed Steel N/A 56 N/A 0.569 in N/A 0.875 in N/A 4.120 in
RC56-625 N/A High Speed Steel N/A 56 N/A 0.625 in N/A 0.875 in N/A 4.120 in
RC56-656 N/A High Speed Steel N/A 56 N/A 0.656 in N/A 0.875 in N/A 4.120 in
RC56-687 N/A High Speed Steel N/A 56 N/A 0.687 in N/A 0.875 in N/A 4.120 in
RC64-569 N/A High Speed Steel N/A 64 N/A 0.459 in N/A 1.000 in N/A 4.120 in
RC64-625 N/A High Speed Steel N/A 64 N/A 0.625 in N/A 1.000 in N/A 4.120 in
RC64-688 N/A High Speed Steel N/A 64 N/A 0.688 in N/A 1.000 in N/A 4.120 in
RC64-750 N/A High Speed Steel N/A 64 N/A 0.750 in N/A 1.000 in N/A 4.120 in
RC64-765 N/A High Speed Steel N/A 64 N/A 0.765 in N/A 1.000 in N/A 4.380 in
RC72-625 N/A High Speed Steel N/A 72 N/A 0.625 in N/A 1.125 in N/A 4.380 in
RC72-688 N/A High Speed Steel N/A 72 N/A 0.688 in N/A 1.125 in N/A 4.380 in
RC72-813 N/A High Speed Steel N/A 72 N/A 0.813 in N/A 1.125 in N/A 4.380 in
RC72-875 N/A High Speed Steel N/A 72 N/A 0.875 in N/A 1.125 in N/A 4.380 in
RC72-927 N/A High Speed Steel N/A 72 N/A 0.927 in N/A 1.125 in N/A 4.500 in
RC82-750 N/A High Speed Steel N/A 82 N/A 0.750 in N/A 1.281 in N/A 4.500 in
RC82-813 N/A High Speed Steel N/A 82 N/A 0.813 in N/A 1.281 in N/A 4.500 in
RC82-938 N/A High Speed Steel N/A 82 N/A 0.938 in N/A 1.281 in N/A 4.500 in
RC82-1000 N/A High Speed Steel N/A 82 N/A 1.000 in N/A 1.281 in N/A 4.750 in
RC90-813 N/A High Speed Steel N/A 90 N/A 0.813 in N/A 1.406 in N/A 4.750 in
RC90-875 N/A High Speed Steel N/A 90 N/A 0.875 in N/A 1.406 in N/A 4.750 in
RC90-938 N/A High Speed Steel N/A 90 N/A 0.938 in N/A 1.406 in N/A 4.750 in
RC90-1094 N/A High Speed Steel N/A 90 N/A 1.094 in N/A 1.406 in N/A 4.750 in
RC90-1125 N/A High Speed Steel N/A 90 N/A 1.125 in N/A 1.406 in N/A 4.750 in
RC100-938 N/A High Speed Steel N/A 100 N/A 0.938 in N/A 1.562 in N/A 4.750 in
RC100-1000 N/A High Speed Steel N/A 100 N/A 1.000 in N/A 1.562 in N/A 4.750 in
RC100-1094 N/A High Speed Steel N/A 100 N/A 1.094 in N/A 1.562 in N/A 4.750 in
RC124-1094 N/A High Speed Steel N/A 124 N/A 1.094 in N/A 1.937 in N/A 4.750 in
RC124-1125 N/A High Speed Steel N/A 124 N/A 1.125 in N/A 1.937 in N/A 4.750 in
Unit of Measure
1