Letter Drill Size Cutting Speed & RPM
Drill Size |
Cutting Speed (Feet per Minute) |
30 |
40 |
50 |
60 |
70 |
80 |
90 |
100 |
110 |
130 |
150 |
Revolutions per Minute |
A |
491 |
654 |
818 |
982 |
1145 |
1309 |
1472 |
1636 |
1796 |
2122 |
2448 |
B |
482 |
642 |
803 |
963 |
1124 |
1284 |
1445 |
1605 |
1765 |
2086 |
2407 |
C |
473 |
631 |
789 |
947 |
1105 |
1262 |
1420 |
1578 |
1736 |
2052 |
2368 |
D |
467 |
622 |
778 |
934 |
1089 |
1245 |
1400 |
1556 |
1708 |
2018 |
2329 |
E |
458 |
611 |
764 |
917 |
1070 |
1222 |
1375 |
1528 |
1681 |
1968 |
2292 |
F |
446 |
594 |
743 |
892 |
1040 |
1189 |
1337 |
1486 |
1635 |
1932 |
2229 |
G |
440 |
585 |
732 |
878 |
1024 |
1170 |
1317 |
1463 |
1610 |
1903 |
2195 |
H |
430 |
574 |
718 |
862 |
1005 |
1149 |
1292 |
1436 |
1580 |
1867 |
2154 |
I |
421 |
562 |
702 |
842 |
983 |
1123 |
1264 |
1404 |
1545 |
1826 |
2106 |
J |
414 |
552 |
690 |
827 |
965 |
1103 |
1241 |
1379 |
1517 |
1793 |
2068 |
K |
408 |
544 |
680 |
815 |
951 |
1087 |
1223 |
1359 |
1495 |
1767 |
2039 |
L |
395 |
527 |
659 |
790 |
922 |
1054 |
1185 |
1317 |
1449 |
1712 |
1976 |
M |
389 |
518 |
648 |
777 |
907 |
1036 |
1166 |
1295 |
1424 |
1683 |
1942 |
N |
380 |
506 |
633 |
759 |
886 |
1012 |
1139 |
1265 |
1391 |
1644 |
1897 |
O |
363 |
484 |
605 |
725 |
846 |
967 |
1088 |
1209 |
1330 |
1571 |
1813 |
P |
355 |
473 |
592 |
710 |
828 |
946 |
1065 |
1183 |
1301 |
1537 |
1774 |
Q |
345 |
460 |
575 |
690 |
805 |
920 |
1035 |
1150 |
1266 |
1496 |
1726 |
R |
338 |
451 |
564 |
676 |
789 |
902 |
1014 |
1127 |
1239 |
1465 |
1690 |
S |
329 |
439 |
549 |
659 |
769 |
878 |
988 |
1098 |
1207 |
1427 |
1646 |
T |
320 |
426 |
533 |
640 |
746 |
853 |
959 |
1066 |
1173 |
1387 |
1600 |
U |
311 |
415 |
519 |
623 |
727 |
830 |
934 |
1038 |
1142 |
1349 |
1557 |
V |
304 |
405 |
507 |
608 |
709 |
810 |
912 |
1013 |
1114 |
1317 |
1520 |
W |
297 |
396 |
495 |
594 |
693 |
792 |
891 |
989 |
1088 |
1286 |
1484 |
X |
289 |
385 |
481 |
576 |
672 |
769 |
865 |
962 |
1058 |
1251 |
1443 |
Y |
284 |
378 |
473 |
567 |
662 |
756 |
851 |
945 |
1040 |
1229 |
1418 |
Z |
277 |
370 |
462 |
555 |
647 |
740 |
832 |
925 |
1017 |
1202 |
1387 |