Page 14 - Michigan Drill

Aircraft Jobber Length Drills

High Speed Steel – Oxide Finish
List No. 300SA – Type “A”, 118° Split Point,
HOLE MAKING List No. 300SB – Type “B”, 135° Split Point N A S 0 7
Standard Web Construction
Type “A” drills are made with 118° split points and a standard
web construction which allows easier penetration than Type “B”.

Heavy Duty Web Construction
A.I. . A
Type “B” drills are made with a heavy web construction and may be used with heavier
feeds in harder materials. Because of torsional strength and a 135° split point, this drill is
popular in hand held drilling applications to reduce breakage and eliminate skidding or walking.
Fractional Sizes
Price Each Price Each
Dec. Flute Overall Pkg. Type A Type B Dec. Flute Overall Pkg. Type A Type B
Size Size
Equiv. Length Length Qty. 300SA 300SB Equiv. Length Length Qty. 300SA 300SB
1/64 .0156 3/16 3/4 12 –– 1.49 17/64 .2656 2-7/8 4-1/8 12 2.90 2.90
1/32 .0312 1/2 1-3/8 12 –– 1.49 9/32 .2812 2-15/16 4-1/4 6 3.07 3.07
3/64 .0469 3/4 1-3/4 12 1.31 1.31 19/64 .2969 3-1/16 4-3/8 6 3.56 3.56
1/16 .0625 7/8 1-7/8 12 1.16 1.16 5/16 .3125 3-3/16 4-1/2 6 3.86 3.86
5/64 .0781 1 2 12 1.17 1.17 21/64 .3281 3-5/16 4-5/8 6 4.29 4.29
3/32 .0938 1-1/4 2-1/4 12 1.25 1.25 11/32 .3438 3-7/16 4-3/4 6 4.61 4.61
7/64 .1094 1-1/2 2-5/8 12 1.29 1.29 23/64 .3594 3-1/2 4-7/8 6 5.35 5.35
1/8 .1250 1-5/8 2-3/4 12 1.31 1.31 3/8 .3750 3-5/8 5 6 5.61 5.61
9/64 .1406 1-3/4 2-7/8 12 1.45 1.45 25/64 .3906 3-3/4 5-1/8 6 6.27 6.27
5/32 .1562 2 3-1/8 12 1.55 1.55 13/32 .4062 3-7/8 5-1/4 6 6.40 6.40
11/64 .1719 2-1/8 3-1/4 12 1.64 1.64 27/64 .4219 3-15/16 5-3/8 6 7.33 7.33
3/16 .1875 2-5/16 3-1/2 12 1.88 1.88 7/16 .4375 4-1/16 5-1/2 6 7.50 7.50
13/64 .2031 2-7/16 3-5/8 12 1.97 1.97 29/64 .4531 4-3/16 5-5/8 6 8.57 8.57
7/32 .2188 2-1/2 3-3/4 12 2.08 2.08 15/32 .4688 4-5/16 5-3/4 6 8.98 8.98
15/64 .2344 2-5/8 3-7/8 12 2.34 2.34 31/64 .4844 4-3/8 5-7/8 6 9.42 9.42
1/4 .2500 2-3/4 4 12 2.44 2.44 1/2 .5000 4-1/2 6 6 9.74 9.74
Sizes with decimal equivalent smaller than .0625 are not split point.
Wire Gauge Sizes
Package Quantity: 12 drills Price Each Price Each
Dec. Flute Overall Type A Type B Dec. Flute Overall Type A Type B
Size Size
Equiv. Length Length 300SA 300SB Equiv. Length Length 300SA 300SB
1 .2280 2-5/8 3-7/8 2.44 2.44 31 .1200 1-5/8 2-3/4 1.33 1.33
2 .2210 2-5/8 3-7/8 2.44 2.44 32 .1160 1-5/8 2-3/4 1.33 1.33
3 .2130 2-1/2 3-3/4 2.31 2.31 33 .1130 1-1/2 2-5/8 1.33 1.33
4 .2090 2-1/2 3-3/4 2.31 2.31 34 .1110 1-1/2 2-5/8 1.33 1.33
5 .2055 2-1/2 3-3/4 2.31 2.31 35 .1100 1-1/2 2-5/8 1.33 1.33
6 .2040 2-1/2 3-3/4 2.31 2.31 36 .1065 1-7/16 2-1/2 1.33 1.33
7 .2010 2-7/16 3-5/8 1.98 1.98 37 .1040 1-7/16 2-1/2 1.33 1.33
8 .1990 2-7/16 3-5/8 2.05 2.05 38 .1015 1-7/16 2-1/2 1.33 1.33
9 .1960 2-7/16 3-5/8 2.05 2.05 39 .0995 1-3/8 2-3/8 1.33 1.33
10 .1935 2-7/16 3-5/8 2.05 2.05 40 .0980 1-3/8 2-3/8 1.29 1.29
11 .1910 2-5/16 3-1/2 1.93 1.93 41 .0960 1-3/8 2-3/8 1.33 1.33
12 .1890 2-5/16 3-1/2 1.93 1.93 42 .0935 1-1/4 2-1/4 1.33 1.33
13 .1850 2-5/16 3-1/2 1.88 1.88 43 .0890 1-1/4 2-1/4 1.33 1.33
14 .1820 2-3/16 3-3/8 1.88 1.88 44 .0860 1-1/8 2-1/8 1.33 1.33
15 .1800 2-3/16 3-3/8 1.88 1.88 45 .0820 1-1/8 2-1/8 1.33 1.33
16 .1770 2-3/16 3-3/8 1.88 1.88 46 .0810 1-1/8 2-1/8 1.33 1.33
17 .1730 2-3/16 3-3/8 1.88 1.88 47 .0785 1 2 1.33 1.33
18 .1695 2-1/8 3-1/4 1.55 1.55 48 .0760 1 2 1.33 1.33
19 .1660 2-1/8 3-1/4 1.55 1.55 49 .0730 1 2 1.33 1.33
20 .1610 2-1/8 3-1/4 1.51 1.51 50 .0700 1 2 1.33 1.33
21 .1590 2-1/8 3-1/4 1.51 1.51 51 .0670 1 2 1.33 1.33
22 .1570 2 3-1/8 1.51 1.51 52 .0635 7/8 1-7/8 1.33 1.33
23 .1540 2 3-1/8 1.51 1.51 53 .0595 7/8 1-7/8 1.33 1.33
24 .1520 2 3-1/8 1.51 1.51 54 .0550 7/8 1-7/8 1.33 1.33
25 .1495 1-7/8 3 1.51 1.51 55 .0520 7/8 1-7/8 1.33 1.33
26 .1470 1-7/8 3 1.51 1.51 56 .0465 3/4 1-3/4 1.33 1.33
27 .1440 1-7/8 3 1.41 1.41 57 .0430 3/4 1-3/4 1.33 1.33
28 .1405 1-3/4 2-7/8 1.33 1.33 58 .0420 11/16 1-5/8 1.33 1.33
29 .1360 1-3/4 2-7/8 1.33 1.33 59 .0410 11/16 1-5/8 1.33 1.33
30 .1285 1-5/8 2-3/4 1.24 1.24 60 .0400 11/16 1-5/8 1.33 1.33
Sizes with decimal equivalent smaller than .0625 are not split point.
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