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
 

Screw Machine Half Round Drills

Half round drills have become widely used in the screw machine industry.  They are designed for quick penetration in brass ond other free machining metals.  These drills provide greater chip clearance and provide a very smooth finish in many applications.  118 deg. standard point.

Fractional Sizes
catalog page: 39
Size Part Number Decimal Equivalent Overall Length Flute Length
3/64 325003 .0469 1-3/8 1/2
1/16 325004 .0625 1-5/8 5/8
5/64 325005 .0781 1-11/16 11/16
3/32 325006 .0938 1-3/4 3/4
7/64 325007 .1094 1-13/16 13/16
1/8 325008 .1250 1-7/8 7/8
9/64 325009 .1406 1-15/16 15/16
5/32 325010 .1563 2-1/16 1
11/64 325011 .1719 2-1/8 1-1/16
3/16 325012 .1875 2-3/16 1-1/8
13/64 325013 .2031 2-1/4 1-3/16
7/32 325014 .2188 2-3/8 1-1/4
15/64 325015 .2344 2-7/16 1-5/16
1/4 325016 .2500 2-1/2 1-3/8
17/64 325017 .2656 2-5/8 1-7/16
9/32 325018 .2813 2-11/16 1-1/2
19/64 325019 .2969 2-3/4 1-9/16
5/16 325020 .3125 2-13/16 1-5/8
21/64 325021 .3281 2-15/16 1-11/16
11/32 325022 .3438 3 1-11/16
23/64 325023 .3594 3-1/16 1-3/4
3/8 325024 .3750 3-1/8 1-13/16
25/64 325025 .3906 3-1/4 1-7/8
13/32 325026 .4063 3-5/16 1-15/16
27/64 325027 .4219 3-3/8 2
7/16 325028 .4375 3-7/16 2-1/16
29/64 325029 .4531 3-9/16 2-1/8
15/32 325030 .4688 3-5/8 2-1/8
31/64 325031 .4844 3-11/16 2-3/16
1/2 325032 .5000 3-3/4 2-1/4
Letter Sizes
catalog page: 39
Size Part Number Decimal Equivalent Overall Length Flute Length
A 327901 .2340 2-7/16 1-5/16
B 327902 .2380 2-1/2 1-3/8
C 327903 .2420 2-1/2 1-3/8
D 327904 .2460 2-1/2 1-3/8
E 327905 .2500 2-1/2 1-3/8
F 327906 .2570 2-5/8 1-7/16
G 327907 .2610 2-5/8 1-7/16
H 327908 .2660 2-11/16 1-1/2
I 327909 .2720 2-11/16 1-1/2
J 327910 .2770 2-11/16 1-1/2
K 327911 .2810 2-11/16 1-1/2
L 327912 .2900 2-3/4 1-9/16
M 327913 .2950 2-3/4 1-9/16
N 327914 .3020 2-13/16 1-5/8
O 327915 .3160 2-15/16 1-11/16
P 327916 .3230 2-15/16 1-11/16
Q 327917 .3320 3 1-11/16
R 327918 .3390 3 1-11/16
S 327919 .3480 3-1/16 1-3/4
T 327920 .3580 3-1/16 1-3/4
U 327921 .3680 3-1/8 1-13/16
V 327922 .3770 3-1/4 1-7/8
W 327923 .3860 3-1/4 1-7/8
X 327924 .3970 3-5/16 1-15/16
Y 327925 .4040 3-5/16 1-15/16
Z 327926 .4130 3-3/8 2
Wire Gauge Sizes
catalog page: 40
Size Part Number Decimal Equivalent Overall Length Flute Length
1 326801 .2280 2-7/16 1-5/16
2 326802 .2210 2-7/16 1-5/16
3 326803 .2130 2-3/8 1-1/4
4 326804 .2090 2-3/8 1-1/4
5 326805 .2055 2-3/8 1-1/4
6 326806 .2040 2-3/8 1-1/4
7 326807 .2010 2-1/4 1-3/16
8 326808 .1990 2-1/4 1-3/16
9 326809 .1960 2-1/4 1-3/16
10 326810 .1935 2-1/4 1-3/16
11 326811 .1910 2-1/4 1-3/16
12 326812 .1890 2-1/4 1-3/16
13 326813 .1850 2-3/16 1-1/8
14 326814 .1820 2-3/16 1-1/8
15 326815 .1800 2-3/16 1-1/8
16 326816 .1770 2-3/16 1-1/8
17 326817 .1730 2-3/16 1-1/8
18 326818 .1695 2-1/8 1-1/16
19 326819 .1660 2-1/8 1-1/16
20 326820 .1610 2-1/8 1-1/16
21 326821 .1590 2-1/8 1-1/16
22 326822 .1570 2-1/8 1-1/16
23 326823 .1540 2-1/16 1
24 326824 .1520 2-1/16 1
25 326825 .1495 2-1/16 1
26 326826 .1470 2-1/16 1
27 326827 .1440 2-1/16 1
28 326828 .1405 1-15/16 15/16
29 326829 .1360 1-15/16 15/16
30 326830 .1285 1-15/16 15/16
31 326831 .1200 1-7/8 7/8
32 326832 .1160 1-7/8 7/8
33 326833 .1130 1-7/8 7/8
34 326834 .1110 1-7/8 7/8
35 326835 .1100 1-7/8 7/8
36 326836 .1065 1-13/16 13/16
37 326837 .1040 1-13/16 13/16
38 326838 .1015 1-13/16 13/16
39 326839 .0995 1-13/16 13/16
40 326840 .0980 1-13/16 13/16
41 326841 .0960 1-13/16 13/16
42 326842 .0935 1-3/4 3/4
43 326843 .0890 1-3/4 3/4
44 326844 .0860 1-3/4 3/4
45 326845 .0820 1-3/4 3/4
46 326846 .0810 1-3/4 3/4
47 326847 .0785 1-11/16 11/16
48 326848 .0760 1-11/16 11/16
49 326849 .0730 1-11/16 11/16
50 326850 .0700 1-11/16 11/16
51 326851 .0670 1-11/16 11/16
52 326852 .0635 1-11/16 11/16
53 326853 .0595 1-5/8 5/8
54 326854 .0550 1-5/8 5/8
55 326855 .0520 1-5/8 5/8
56 326856 .0465 1-3/8 1/2
57 326857 .0430 1-3/8 1/2
58 326858 .0420 1-3/8 1/2
59 326859 .0410 1-3/8 1/2
60 326860 .0400 1-3/8 1/2
 
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