Page 19 - Michigan Drill

Cobalt Jobber Length Drills

Cobalt Heavy Duty – 135° Split Point - Type J

List No. 300C – Super Cobalt
Cobalt drills display higher red hardness and are especially
effective in drilling tough, high tensile strength materials like
stainless steels, titanium, and inconel.

Wire Gauge Sizes
Wire Gauge Sizes HOLE MAKING
Package Quantity: 12 drills
Decimal Flute Overall Price Decimal Flute Overall Price
Size Size
Equivalent Length Length Each Equivalent Length Length Each
1 .2280 2-5/8 3-7/8 4.55 41 .0960 1-3/8 2-3/8 1.88
2 .2210 2-5/8 3-7/8 4.55 42 .0935 1-1/4 2-1/4 1.88
3 .2130 2-1/2 3-3/4 4.29 43 .0890 1-1/4 2-1/4 1.88
4 .2090 2-1/2 3-3/4 4.29 44 .0860 1-1/8 2-1/8 1.88
5 .2055 2-1/2 3-3/4 4.29 45 .0820 1-1/8 2-1/8 1.88
6 .2040 2-1/2 3-3/4 4.29 46 .0810 1-1/8 2-1/8 1.88
7 .2010 2-7/16 3-5/8 3.66 47 .0785 1 2 1.88
8 .1990 2-7/16 3-5/8 3.66 48 .0760 1 2 1.88
9 .1960 2-7/16 3-5/8 3.66 49 .0730 1 2 1.88
10 .1935 2-7/16 3-5/8 3.66 50 .0700 1 2 1.88
11 .1910 2-5/16 3-1/2 3.66 51 .0670 1 2 1.88
12 .1890 2-5/16 3-1/2 3.56 52 .0635 7/8 1-7/8 1.88
13 .1850 2-5/16 3-1/2 3.29 53 .0595 7/8 1-7/8 1.88
14 .1820 2-3/16 3-3/8 3.29 54 .0550 7/8 1-7/8 1.88
15 .1800 2-3/16 3-3/8 3.29 55 .0520 7/8 1-7/8 1.88
16 .1770 2-3/16 3-3/8 3.21 56 .0465 3/4 1-3/4 1.98
17 .1730 2-3/16 3-3/8 3.21 57 .0430 3/4 1-3/4 1.98
18 .1695 2-1/8 3-1/4 2.99 58 .0420 11/16 1-5/8 1.98
19 .1660 2-1/8 3-1/4 2.89 59 .0410 11/16 1-5/8 1.98
20 .1610 2-1/8 3-1/4 2.89 60 .0400 11/16 1-5/8 1.98
21 .1590 2-1/8 3-1/4 2.89 61 .0390 11/16 1-5/8 2.19
22 .1570 2 3-1/8 2.89 62 .0380 5/8 1-1/2 2.19
23 .1540 2 3-1/8 2.89 63 .0370 5/8 1-1/2 2.19
24 .1520 2 3-1/8 2.89 64 .0360 5/8 1-1/2 2.19
25 .1495 1-7/8 3 2.56 65 .0350 5/8 1-1/2 2.19
26 .1470 1-7/8 3 2.56 66 .0330 1/2 1-3/8 2.33
27 .1440 1-7/8 3 2.56 67 .0320 1/2 1-3/8 2.33
28 .1405 1-3/4 2-7/8 2.56 68 .0310 1/2 1-3/8 2.33
29 .1360 1-3/4 2-7/8 2.56 69 .0292 1/2 1-3/8 2.62
30 .1285 1-5/8 2-3/4 2.18 70 .0280 3/8 1-1/4 2.62
31 .1200 1-5/8 2-3/4 2.18 71 .0260 3/8 1-1/4 2.62
32 .1160 1-5/8 2-3/4 2.18 72 .0250 5/16 1-1/8 2.77
33 .1130 1-1/2 2-5/8 2.01 73 .0240 5/16 1-1/8 2.77
34 .1110 1-1/2 2-5/8 2.01 74 .0225 1/4 1 2.77
35 .1100 1-1/2 2-5/8 2.01 75 .0210 1/4 1 3.46
36 .1065 1-7/16 2-1/2 2.01 76 .0200 3/16 7/8 3.46
37 .1040 1-7/16 2-1/2 2.01 77 .0180 3/16 7/8 4.49
38 .1015 1-7/16 2-1/2 1.88 78 .0160 3/16 7/8 4.49
39 .0995 1-3/8 2-3/8 1.88 79 .0145 1/8 3/4 4.49
40 .0980 1-3/8 2-3/8 1.88 80 .0135 1/8 3/4 4.49
Sizes with decimal equivalent smaller than .0625 are not split point.
Wire Gauge & Combination Sets

Sizes Material Pieces Set No. Price
1 – 60 Wire Gauge Cobalt 60 307CW 169.87
61 – 80 Wire Gauge Cobalt 20 307CV 68.29
1/16 – 1/2 by 64ths, A – Z Letter, Cobalt 115 307CX 638.57
and 1 – 60 Wire Gauge
1/16, 5/64, 3/32, 1/8, #29, #25,
5/32, #21,3/16, #7, 7/32, 1/4, F, Cobalt 19 307CJ 118.80
5/16, U, 3/8, 27/64, 7/16,1/2
All sets are supplied in Huot metal index

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