TOOL – CHAMFERED STEP DRILL FOR ALUMINUM APPLICATIONS
| PART NUMBER | A DIA | B DIA | C ±.005 | D ±.250 |
| RCADC16-136 | .1353-.1360 | .2570-.2580 | .312 | 4.125 |
| RCADC16-149 | .1483-.1490 | .2570-.2580 | .312 | 4.125 |
| RCADC16-159 | .1583-.1590 | .2570-.2580 | .312 | 4.125 |
| RCADC18-149 | .1483-.1490 | .2900-.2910 | .375 | 4.375 |
| RCADC18-149S | .1483-.1490 | .2900-.2910 | .435 | 4.375 |
| RCADC18-159S | .1583-.1590 | .2900-.2910 | .435 | 4.375 |
| RCADC18-177 | .1763-.1770 | .2900-.2910 | .375 | 4.375 |
| RCADC18-180 | .1793-.1800 | .2900-.2910 | .375 | 4.375 |
| RCADC21-201 | .2003-2010 | .3360-.3370 | .437 | 4.750 |
| RCADC21-201 | .2003-2010 | .3360-.3370 | .437 | 4.750 |
| RCADC21-201S | .2003-2010 | .3360-.3370 | .540 | 4.750 |
| RCADC21-213 | .2123-.2130 | .3360-.3370 | .437 | 4.750 |
| RCADC21-213S | .2123-.2130 | .3360-.3370 | .471 | 4.750 |
| RCADC23-257 | .2560-.2570 | .3690-.3700 | .500 | 5.000 |
| RCADC23-257S | .2560-.2570 | .3690-.3700 | .671 | 5.000 |
| RCADC23-272 | .2710-.2720 | .3690-.3700 | .500 | 5.000 |
| RCADC23-272S | .2710-.2720 | .3690-.3700 | .608 | 5.000 |
| RCADC24-257 | .2560-.2570 | .3800-.3810 | .500 | 5.125 |
| RCADC24-257S | .2560-.2570 | .3800-.3810 | .588 | 5.125 |
| RCADC24-272 | .2710-.2720 | .3800-.3810 | .500 | 5.125 |
| PART NUMBER | A DIA | B DIA | C ±.005 | D ±.250 |
| RCADC24-312 | .3110-.3120 | .3800-.3810 | .500 | 5.125 |
| RCADC24-332 | .3310-.3320 | .3800-.3810 | .482 | 5.125 |
| RCADC27-312 | .3110-.3120 | .4310-.4320 | .562 | 5.500 |
| RCADC27-312S | .3110-.3120 | .4310-.4320 | .810 | 5.500 |
| RCADC27-332 | .3310-.3320 | .4310-.4320 | .562 | 5.500 |
| RCADC27-332S | .3310-.3320 | .4310-.4320 | .717 | 5.500 |
| RCADC28-312 | .3110-.3120 | .4470-.4480 | .562 | 5.625 |
| RCADC28-312S | .3110-.3120 | .4470-.4480 | .807 | 5.625 |
| RCADC28-332 | .3310-.3320 | .4470-.4480 | .562 | 5.625 |
| RCADC28-332 | .3310-.3320 | .4470-.4480 | .562 | 5.625 |
| RCADC28-332S | .3310-.3320 | .4470-.4480 | .709 | 5.625 |
| RCADC28-343 | .3420-.3430 | .4470-.4480 | .562 | 5.625 |
| RCADC28-368 | .3670-.3680 | .4470-.4480 | .562 | 5.625 |
| RCADC31-368 | .367-.3680 | .4940-.4950 | .625 | 6.000 |
| RCADC31-386 | .3850-.3860 | .4940-.4950 | .625 | 6.000 |
| RCADC31-368 | .3670-.3680 | .5248-.5260 | .625 | 3.875 |
| RCADC31-368S | .3670-.3680 | .5248-.5260 | .792 | 3.875 |
| RCADC33-386 | .3850-.3860 | .5248-.5260 | .625 | 3.875 |
| RCADC33-386S | .3850-.3860 | .5248-.5260 | .783 | 3.875 |
| RCADC33-422 | .4210-.4220 | .5248-.5260 | .625 | 3.875 |
NOTES: UNLESS OTHERWISE SPECIFIED
1. MATERIAL: High speed
[2] Conical point optional.
| PART NUMBER | A DIA | B DIA | C ±.005 | D ±.250 |
| RCADC38-422S | .4210-.4220 | .5998-.6010 | .960 | 4.250 |
| RCADC38-453 | .4520-.4530 | .5998-.6010 | .687 | 4.250 |
| RCADC38-453S | .4520-.4530 | .5998-.6010 | .915 | 4.250 |
| RCADC38-484 | .4830-.4840 | .5998-.6010 | .687 | 4.250 |
| RCADC38-506 | .5050-.5060 | .5998-.6010 | .687 | 4.250 |
| RCADC38-516 | .5148-.5160 | .5998-.6010 | .893 | 4.250 |
| RCADC43-578 | .5768-.5780 | .6733-.6745 | 1.050 | 4.500 |
| RCADC47-484S | .4830-.4840 | .7458-.7470.997 | .997 | 5.000 |
| RCADC47-506S | .5050-.5060 | .7458-.7470 | .870 | 5.000 |
| RCADC47-535 | .5338-.5350 | .7458-.7470 | .750 | 5.000 |
| RCADC47-535S | .5338-.5350 | .7458-.7470 | 1.185 | 5.000 |
| RCADC47-569 | .5678-.5690 | .7458-.7470 | 750 | 5.000 |
| RCADC47-569S | .5678-.5690 | .7458-.7470 | 1.026 | 5.000 |
| RCADC56- | .6548-.6560 | .8868-.8880 | .812 | 5.625 |
| RCADC56-656S | .6548-.6560 | .8868-.8880 | 1.325 | 5.625 |
| RCADC56-687 | .6858-.6870 | .8868-.8880 | .812 | 5.625 |
| RCADC56-687S | .6858-.6870 | .8868-.8880 | 1.168 | 5.625 |
| RCADC56-802S | .8008-.8020 | .8868-.8880 | 1.556 | 5.625 |
| PART NUMBER | A DIA | B DIA | C ±.005 | D ±.250 |
| RCADC64-765 | .7638-.7650 | 1.0135-1.0150 | .937 | 6.000 |
| RCADC64-765S | .7638-.7650 | 1.0135-1.0150 | 1.432 | 6.000 |
| RCADC64-802 | .8008-.8020 | 1.0135-1.0150 | .937 | 6.000 |
| RCADC64-802S | .8008-.8020 | 1.0135-1.0150 | 1.432 | 6.000 |
| RCADC64-927 | 9258-.9270 | 1.0135-1.0150 | .937 | 6.000 |
| RCADC72-875 | .8738.875 | 1.1375-1.1390 | 1.062 | 6.625 |
| RCADC72-875S | .8738-.8750 | 1.1375-1.1390 | 1.965 | 6.625 |
| RCADC72-922 | .9208-.9220 | 1.1375-1.1390 | 1.062 | 6.625 |
| RCADC72-927 | .9258-.9270 | 1.1375-1.1390 | 1.062 | 6.625 |
| RCADC72-953 | .9518-.9530 | 1.1375-1.1390 | .970 | 6.625 |
| RCADC82-984 | .9828-.9840 | 1.2965-1.2980 | 1.187 | 7.000 |
| RCADC82-1043 | 1.0415-1.0430 | 1.2965-1.2980 | 1.187 | 7.000 |
| RCADC82-1043S | 1.0415-1.0430 | 1.2965-1.2980 | 1.812 | 7.000 |
| RCADC82-1165 | 1.1635-1.1650 | 1.2965-1.2980 | 1.812 | 7.000 |
| RCADC90-1109 | 1.1075-1.1090 | 1.4255-1.4270 | 1.312 | 7.375 |
| RCADC90-1165 | 1.1635-1.1650 | 1.4255-1.4270 | 1.312 | 7.375 |
| RCADC100-1228 | 1.2265-1.2280 | 1.5775-1.5790 | 1.437 | 7.750 |
| RCADC100-1289 | 1.2875-1.2890 | 1.5775-1.5790 | 1.437 | 7.750 |
| RCADC124-1531 | 1.5295-1.5310 | 1.9515-1.9530 | 1.625 | 8.500 |
NOTES: CONTINUED
3. HEAT TREAT: Per drill manufacturer’s standard.
4. FINISH: Strippable plastic coat to protect cutting Tube packaging optional.
5. Made from standard straight shank jobbers or screw machine twist drills.
[6] Configuration applicable only for part number RCDC72-875 thru RCDC124-1789.
7. Dimensions and tolerances not shown are pr ANSI 11M.
8. CAUTION: Step drills are designed for thru hole When used to drill a blind hole, it may be
necessary to grind the drill to suit the depth required.