Page 66 - Michigan Drill

Aircraft Extension Drills

High Speed & Cobalt – Split Point

6" Overall Length
HOLE MAKING List No. 906C – Cobalt N A S 0 7
List No. 906 – High Speed Steel

A.I. . A
12" Overall Length
List No. 912 – High Speed Steel
List No. 912C – Cobalt
materials like Stainless Steels, Titanium, and Inconel.
Price Each Cobalt drills are used in drilling tough, high tensile strength
Price Each
High Speed Cobalt High Speed Cobalt
Dec. Flute Dec. Flute
Size Size
Equiv. Length 6" OAL 12" OAL 6" OAL 12" OAL Equiv. Length 6" OAL 12" OAL 6" OAL 12" OAL
906 912 906C 912C 906 912 906C 912C
73 .0240 3/16 10.50 — — — 23 .1540 2 3.52 9.97 8.10 18.90
69 .0292 1/2 9.77 — — — 5/32 .1562 2 3.17 7.85 6.53 15.93
68 .0310 1/2 9.77 — — — 22 .1570 2 3.52 9.97 8.10 18.90
67 .0320 1/2 9.77 — — — 21** .1590 2-1/8 3.30 7.36 7.07 15.66
66 .0330 1/2 9.77 — — — 20 .1610 2-1/8 3.30 7.36 7.07 15.66
65 .0350 5/8 9.77 — — — 19 .1660 2-1/8 3.63 9.90 8.55 18.90
64 .0360 5/8 9.77 — — — 18 .1695 2-1/8 3.83 9.90 8.55 18.90
63 .0370 5/8 9.77 — — — 11/64 .1719 2-1/8 3.40 8.55 7.01 16.56
62 .0380 5/8 9.77 — — — 17 .1730 2-3/16 3.83 9.90 8.55 18.90
61 .0390 11/16 9.77 — — — 16 .1770 2-3/16 3.83 9.90 8.55 18.90
60 .0400 11/16 7.19 11.37 14.40 — 15 .1800 2-3/16 3.83 9.90 8.55 18.90
59 .0410 11/16 7.19 11.37 14.40 — 14 .1820 2-3/16 3.83 9.90 8.55 18.90
58 .0420 11/16 7.19 11.37 14.40 — 13 .1850 2-5/16 3.83 9.14 9.00 18.90
57 .0430 3/4 7.19 10.56 14.40 — 3/16 .1875 2-5/16 3.40 8.55 7.01 16.56
56 .0465 3/4 5.91 10.56 14.40 — 12 .1890 2-5/16 3.83 9.90 9.00 18.90
3/64 .0469 3/4 5.64 11.20 14.40 — 11 .1910 2-5/16 3.83 9.90 8.23 18.90
55 .0520 7/8 5.91 10.56 14.40 — 10 .1935 2-7/16 4.09 8.84 8.23 16.56
54 .0550 7/8 5.91 10.56 14.40 — 9 .1960 2-7/16 4.29 9.90 10.35 22.50
53 .0595 7/8 5.91 10.56 14.40 — 8 .1990 2-7/16 4.29 9.90 10.35 22.50
1/16 .0625 7/8 3.07 9.08 6.75 21.15 7 .2010 2-7/16 4.29 9.90 10.35 22.50
52 .0635 7/8 3.47 9.98 7.65 21.15 13/64 .2031 2-7/16 4.13 9.57 8.60 20.12
51 .0670 1 3.47 9.98 7.65 21.15 6 .2040 2-1/2 4.59 10.89 10.35 22.50
50 .0700 1 3.14 10.69 7.65 21.15 5 .2055 2-1/2 4.59 10.89 10.35 22.50
49 .0730 1 3.47 10.69 7.65 21.15 4 .2090 2-1/2 4.59 11.48 10.35 22.50
48 .0760 1 3.47 10.69 7.65 21.15 3 .2130 2-1/2 4.59 11.48 10.35 21.02
5/64 .0781 1 3.07 9.08 6.75 21.15 7/32 .2188 2-1/2 4.13 9.57 8.96 20.12
47 .0785 1 3.47 10.69 7.65 21.15 2 .2210 2-5/8 4.79 11.48 10.35 21.02
46 .0810 1-1/8 3.47 10.69 7.65 21.15 1 .2280 2-5/8 4.79 11.48 10.35 21.02
45 .0820 1-1/8 3.47 10.69 7.65 21.15 A .2340 2-5/8 7.59 16.93 13.39 —
44 .0860 1-1/8 3.47 10.69 7.65 21.15 15/64 .2344 2-5/8 4.49 10.30 10.03 21.06
43 .0890 1-1/4 3.47 10.69 7.65 21.15 B .2380 2-3/4 7.59 16.93 13.39 —
42 .0935 1-1/4 2.77 9.98 6.12 21.15 C .2420 2-3/4 7.59 16.93 13.39 —
3/32 .0938 1-1/4 2.61 9.41 5.85 15.16 D .2460 2-3/4 7.59 16.93 13.39 29.79
41 .0960 1-3/8 2.77 9.98 6.12 21.15 1/4 .2500 2-3/4 4.29 9.60 10.76 21.06
40 .0980 1-3/8 2.61 8.18 5.76 15.21 F .2570 2-7/8 7.39 16.17 17.78 34.37
39 .0995 1-3/8 3.20 9.97 6.12 18.90 G .2610 2-7/8 12.21 16.93 — —
38 .1015 1-7/16 3.20 9.97 6.12 18.90 17/64 .2656 2-7/8 9.57 12.71 23.40 28.94
37 .1040 1-7/16 3.20 9.97 6.12 18.90 H .2660 2-7/8 13.07 18.48 — —
36 .1065 1-7/16 3.20 9.97 6.12 18.90 I .2720 2-7/8 13.07 17.13 — 35.82
7/64 .1094 1-1/2 2.61 9.41 5.85 15.16 J .2770 2-7/8 13.07 18.48 — —
35 .1100 1-1/2 3.20 9.97 6.30 18.90 K .2810 2-15/16 13.07 19.80 27.00 —
34 .1110 1-1/2 3.30 9.97 6.30 18.90 9/32 .2812 2-15/16 9.90 12.71 27.00 34.18
33 .1130 1-1/2 3.30 9.97 6.30 18.90 L .2900 2-15/16 15.84 24.42 — —
32 .1160 1-5/8 3.30 9.97 6.30 18.90 M .2950 3-1/16 15.84 24.42 — —
31 .1200 1-5/8 3.30 8.18 6.30 18.90 19/64 .2969 3-1/16 11.00 14.42 29.90 36.40
1/8 .1250 1-5/8 2.61 7.46 5.22 15.16 N .3020 3-1/16 17.82 25.74 — —
30 .1285 1-5/8 2.61 8.18 5.85 15.21 5/16 .3125 3-3/16 11.94 15.64 31.70 37.94
29 .1360 1-3/4 3.27 9.17 7.07 15.66 O .3160 3-3/16 19.14 27.72 — 42.00
28 .1405 1-3/4 3.27 9.17 8.10 18.90 P .3230 3-5/16 19.14 27.72 — —
9/64 .1406 1-3/4 3.17 7.85 7.11 15.93 21/64 .3281 3-5/16 12.90 16.62 — 39.83
27 .1440 1-7/8 3.27 9.17 8.10 18.90 Q .3320 3-7/16 19.14 29.04 — 46.80
26 .1470 1-7/8 3.52 9.97 8.10 18.90 R .3390 3-7/16 21.12 30.03 37.80 —
25 .1495 1-7/8 3.52 9.97 8.10 18.90 11/32 .3438 3-7/16 12.82 16.62 33.75 39.70
24 .1520 2 3.52 9.97 8.10 18.90 S .3480 3-1/2 22.44 31.68 41.40 —
* Sizes with decimal equivalent smaller than .0625 are not split point. **Fast spiral also available from stock.
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