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

 

Cobalt Jobber Drills

They are made with 8% cobalt and have heavy duty flute construction. 1/16" and larger have a 135 degree split point. This type of drill is used in high tensile material such as stainless and titanium. #1 - #52 have a 135 deg. Split point, #53 - #80 have a 135 deg. point.

Fractional Sizes
catalog page: 15
Size Part Number Decimal Equivalent Overall Length Flute Length
1/64 543001 .0156 3/4 3/16
1/32 543002 .0313 1-3/8 1/2
3/64 543003 .0469 1-3/4 3/4
1/16 543004 .0625 1-7/8 7/8
5/64 543005 .0781 2 1
3/32 543006 .0938 2-1/4 1-1/4
7/64 543007 .1094 2-5/8 1-1/2
1/8 543008 .1250 2-3/4 1-5/8
9/64 543009 .1406 2-7/8 1-3/4
5/32 543010 .1563 3-1/8 2
11/64 543011 .1719 3-1/4 2-1/8
3/16 543012 .1875 3-1/2 2-5/16
13/64 543013 .2031 3-5/8 2-7/16
7/32 543014 .2188 3-3/4 2-1/2
15/64 543015 .2344 3-7/8 2-5/8
1/4 543016 .2500 4 2-3/4
17/64 543017 .2656 4-1/8 2-7/8
9/32 543018 .2813 4-1/4 2-15/16
19/64 543019 .2969 4-3/8 3-1/16
5/16 543020 .3125 4-1/2 3-3/16
21/64 543021 .3281 4-5/8 3-5/16
11/32 543022 .3438 4-3/4 3-7/16
23/64 543023 .3594 4-7/8 3-1/2
3/8 543024 .3750 5 3-5/8
25/64 543025 .3906 5-1/8 3-3/4
13/32 543026 .4063 5-1/4 3-7/8
27/64 543027 .4219 5-3/8 3-15/16
7/16 543028 .4375 5-1/2 4-1/16
29/64 543029 .4531 5-5/8 4-3/16
15/32 543030 .4688 5-3/4 4-5/16
31/64 543031 .4844 5-7/8 4-3/8
1/2 543032 .5000 6 4-1/2
Letter Sizes
catalog page: 15
Size Part Number Decimal Equivalent Overall Length Flute Length
A 545901 .2340 3-7/8 2-5/8
B 545902 .2380 4 2-3/4
C 545903 .2420 4 2-3/4
D 545904 .2460 4 2-3/4
E 545905 .2500 4 2-3/4
F 545906 .2570 4-1/8 2-7/8
G 545907 .2610 4-1/8 2-7/8
H 545908 .2660 4-1/8 2-7/8
I 545909 .2720 4-1/8 2-7/8
J 545910 .2770 4-1/8 2-7/8
K 545911 .2810 4-1/4 2-15/16
L 545912 .2900 4-1/4 2-15/16
M 545913 .2950 4-3/8 3-1/16
N 545914 .3020 4-3/8 3-1/16
O 545915 .3160 4-1/2 3-3/16
P 545916 .3230 4-5/8 3-5/16
Q 545917 .3320 4-3/4 3-7/16
R 545918 .3390 4-3/4 3-7/16
S 545919 .3480 4-7/8 3-1/2
T 545920 .3580 4-7/8 3-1/2
U 545921 .3680 5 3-5/8
V 545922 .3770 5 3-5/8
W 545923 .3860 5-1/8 3-3/4
X 545924 .3970 5-1/8 3-3/4
Y 545925 .4040 5-1/4 3-7/8
Z 545926 .4130 5-1/4 3-7/8
Wire Gauge Sizes
catalog page: 16
Size Part Number Decimal Equivalent Overall Length Flute Length
1 544801 .2280 3-7/8 2-5/8
2 544802 .2210 3-7/8 2-5/8
3 544803 .2130 3-3/4 2-1/2
4 544804 .2090 3-3/4 2-1/2
5 544805 .2055 3-3/4 2-1/2
6 544806 .2040 3-3/4 2-1/2
7 544807 .2010 3-5/8 2-7/16
8 544808 .1990 3-5/8 2-7/16
9 544809 .1960 3-5/8 2-7/16
10 544810 .1935 3-5/8 2-7/16
11 544811 .1910 3-1/2 2-5/16
12 544812 .1890 3-1/2 2-5/16
13 544813 .1850 3-1/2 2-5/16
14 544814 .1820 3-3/8 2-3/16
15 544815 .1800 3-3/8 2-3/16
16 544816 .1770 3-3/8 2-3/16
17 544817 .1730 3-3/8 2-3/16
18 544818 .1695 3-1/4 2-1/8
19 544819 .1660 3-1/4 2-1/8
20 544820 .1610 3-1/4 2-1/8
21 544821 .1590 3-1/4 2-1/8
22 544822 .1570 3-1/8 2
23 544823 .1540 3-1/8 2
24 544824 .1520 3-1/8 2
25 544825 .1495 3 1-7/8
26 544826 .1470 3 1-7/8
27 544827 .1440 3 1-7/8
28 544828 .1405 2-7/8 1-3/4
29 544829 .1360 2-7/8 1-3/4
30 544830 .1285 2-3/4 1-5/8
31 544831 .1200 2-3/4 1-5/8
32 544832 .1160 2-3/4 1-5/8
33 544833 .1130 2-5/8 1-1/2
34 544834 .1110 2-5/8 1-1/2
35 544835 .1100 2-5/8 1-1/2
36 544836 .1065 2-1/2 1-7/16
37 544837 .1040 2-1/2 1-7/16
38 544838 .1015 2-1/2 1-7/16
39 544839 .0995 2-3/8 1-3/8
40 544840 .0980 2-3/8 1-3/8
41 544841 .0960 2-3/8 1-3/8
42 544842 .0935 2-1/4 1-1/4
43 544843 .0890 2-1/4 1-1/4
44 544844 .0860 2-1/8 1-1/8
45 544845 .0820 2-1/8 1-1/8
46 544846 .0810 2-1/8 1-1/8
47 544847 .0785 2 1
48 544848 .0760 2 1
49 544849 .0730 2 1
50 544850 .0700 2 1
51 544851 .0670 2 1
52 544852 .0635 1-7/8 7/8
53 544853 .0595 1-7/8 7/8
54 544854 .0550 1-7/8 7/8
55 544855 .0520 1-7/8 7/8
56 544856 .0465 1-3/4 3/4
57 544857 .0430 1-3/4 3/4
58 544858 .0420 1-5/8 11/16
59 544859 .0410 1-5/8 11/16
60 544860 .0400 1-5/8 11/16
61 544861 .0390 1-5/8 11/16
62 544862 .0380 1-1/2 5/8
63 544863 .0370 1-1/2 5/8
64 544864 .0360 1-1/2 5/8
65 544865 .0350 1-1/2 5/8
66 544866 .0330 1-3/8 1/2
67 544867 .0320 1-3/8 1/2
68 544868 .0310 1-3/8 1/2
69 544869 .0292 1-3/8 1/2
70 544870 .0280 1-1/4 3/8
71 544871 .0260 1-1/4 3/8
72 544872 .0250 1-1/8 5/16
73 544873 .0240 1-1/8 5/16
74 544874 .0225 1 1/4
75 544875 .0210 1 1/4
76 544876 .0200 7/8 3/16
77 544877 .0180 7/8 3/16
78 544878 .0160 7/8 3/16
79 544879 .0145 3/4 3/16
80 544880 .0135 3/4 3/16
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