Contact Us

Ohio Drill & Tool Company
23255 Georgetown Rd.

P.O. Box 154 
Homeworth, OH 44634
(330) 525-7717

(800) 826-5237
Fax: (330) 525-5432

 

Aircraft Extension Drills 12

Aircraft extension drills are designed to drill in tough to reach places.  They come in 6" and 12" overalls.  Sizes 1/16" and larger have a 135 deg. split point.


Fractional Sizes
catalog page: 33
Size Part Number Decimal Equivalent Overall Length Flute Length
1/16 538004 .0625 12 7/8
5/64 538005 .0781 12 1
3/32 538006 .0938 12 1-1/4
7/64 538007 .1094 12 1-1/2
1/8 538008 .1250 12 1-5/8
9/64 538009 .1406 12 1-3/4
5/32 538010 .1563 12 2
11/64 538011 .1719 12 2-1/8
3/16 538012 .1875 12 2-5/16
13/64 538013 .2031 12 2-7/16
7/32 538014 .2188 12 2-1/2
15/64 538015 .2344 12 2-5/8
1/4 538016 .2500 12 2-3/4
17/64 538017 .2656 12 2-7/8
9/32 538018 .2813 12 2-15/16
19/64 538019 .2969 12 3-1/16
5/16 538020 .3125 12 3-3/16
21/64 538021 .3281 12 3-5/16
11/32 538022 .3438 12 3-7/16
23/64 538023 .3594 12 3-1/2
3/8 538024 .3750 12 3-5/8
25/64 538025 .3906 12 3-3/4
13/32 538026 .4062 12 3-7/8
27/64 538027 .4219 12 3-15/16
7/16 538028 .4375 12 4-1/16
29/64 538029 .4531 12 4-3/16
15/32 538030 .4688 12 4-5/16
31/64 538031 .4844 12 4-3/8
1/2 538032 .5000 12 4-1/2
Letter Sizes
catalog page: 33
Size Part Number Decimal Equivalent Overall Length Flute Length
A 540901 .2340 12 2-5/8
B 540902 .2380 12 2-3/4
C 540903 .2420 12 2-3/4
D 540904 .2460 12 2-3/4
E 540905 .2500 12 2-3/4
F 540906 .2570 12 2-7/8
G 540907 .2610 12 2-7/8
H 540908 .2660 12 2-7/8
I 540909 .2720 12 2-7/8
J 540910 .2770 12 2-7/8
K 540911 .2810 12 2-15/16
L 540912 .2900 12 2-15/16
M 540913 .2950 12 3-1/16
N 540914 .3020 12 3-1/16
O 540915 .3160 12 3-1/16
P 540916 .3230 12 3-5/16
Q 540917 .3320 12 3-7/16
R 540918 .3390 12 3-7/16
S 540919 .3480 12 3-1/2
T 540920 .3580 12 3-1/2
U 540921 .3680 12 3-5/8
V 540922 .3770 12 3-5/8
W 540923 .3860 12 3-3/4
X 540924 .3970 12 3-3/4
Y 540925 .4040 12 3-7/8
Z 540926 .4130 12 3-7/8
Wire Gauge Sizes
catalog page: 34
Size Part Number Decimal Equivalent Overall Length Flute Length
1 539801 .2280 12 2-5/8
2 539802 .2210 12 2-5/8
3 539803 .2130 12 2-1/2
4 539804 .2090 12 2-1/2
5 539805 .2055 12 2-1/2
6 539806 .2040 12 2-1/2
7 539807 .2010 12 2-7/16
8 539808 .1990 12 2-7/16
9 539809 .1960 12 2-7/16
10 539810 .1935 12 2-7/16
11 539811 .1910 12 2-5/16
12 539812 .1890 12 2-5/16
13 539813 .1850 12 2-5/16
14 539814 .1820 12 2-3/16
15 539815 .1800 12 2-3/16
16 539816 .1770 12 2-3/16
17 539817 .1730 12 2-3/16
18 539818 .1695 12 2-1/8
19 539819 .1660 12 2-1/8
20 539820 .1610 12 2-1/8
21 539821 .1590 12 2-1/8
22 539822 .1570 12 2
23 539823 .1540 12 2
24 539824 .1520 12 2
25 539825 .1495 12 1-7/8
26 539826 .1470 12 1-7/8
27 539827 .1440 12 1-7/8
28 539828 .1405 12 1-3/4
29 539829 .1360 12 1-3/4
30 539830 .1285 12 1-5/8
31 539831 .1200 12 1-5/8
32 539832 .1160 12 1-5/8
33 539833 .1130 12 1-1/2
34 539834 .1110 12 1-1/2
35 539835 .1100 12 1-1/2
36 539836 .1065 12 1-7/16
37 539837 .1040 12 1-7/16
38 539838 .1015 12 1-7/16
39 539839 .0995 12 1-3/8
40 539840 .0980 12 1-3/8
41 539841 .0960 12 1-3/8
42 539842 .0935 12 1-1/4
43 539843 .0890 12 1-1/4
44 539844 .0860 12 1-1/8
45 539845 .0820 12 1-1/8
46 539846 .0810 12 1-1/8
47 539847 .0785 12 1
48 539848 .0760 12 1
49 539849 .0730 12 1
50 539850 .0700 12 1
51 539851 .0670 12 1
52 539852 .0635 12 7/8
53 539853 .0595 12 7/8
54 539854 .0550 12 7/8
55 539855 .0520 12 7/8
56 539856 .0465 12 3/4
57 539857 .0430 12 3/4
58 539858 .0420 12 11/16
59 539859 .0410 12 11/16
60 539860 .0400 12 11/16
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