Common Drill Sizes Chart - University of Florida
Common Drill Sizes Chart
Drill Size
80 79 78 77 76 75 74 73 72 71 70 69 68 67 66 65 64 63 62 62 61 61 1.0 mm 60 59 1.05 mm 58 57 1.1 mm 1.15 mm 56 1.2 mm 1.25 mm 1.3 mm 55 1.35 mm 54 1.4 mm 1.45 mm 1.5 mm 53 1.55 mm 1/16 1.6 mm 52 1.65 mm 1.7 mm 51 1.75 mm 50 1.8 mm 1.85 mm 49 1.9 mm 48 1.95 mm 5/64
Decimal Equivalent
[inches]
0.0135 0.0145 0.0160 0.0180 0.0200 0.0210 0.0225 0.0240 0.0250 0.0260 0.0280 0.0292 0.0310 0.0320 0.0330 0.0350 0.0360 0.0370 0.0380 0.0380 0.0390 0.0390 0.0394 0.0400 0.0410 0.0413 0.0420 0.0430 0.0433 0.0453 0.0465 0.0472 0.0492 0.0512 0.0520 0.0531 0.0550 0.0551 0.0571 0.0591 0.0595 0.0610 0.0625 0.0629 0.0635 0.0650 0.0669 0.0670 0.0689 0.0700 0.0709 0.0728 0.0730 0.0748 0.0760 0.0768 0.0781
Drill Size
47 2.0 mm 2.05 mm
46 45 2.1 mm 2.15 mm 44 2.2 mm 2.25 mm 43 2.3 mm 2.35 mm 42 3/32 2.4 mm 41 2.45 mm 40 2.5 mm 39 38 2.6 mm 37 2.7 mm 36 7/64 35 2.8 mm 34 33 2.9 mm 32 3.0 mm 31 3.1 mm 1/8 3.2 mm 30 3.3 mm 3.4 mm 29 3.5 mm 28 9/64 3.6 mm 27 3.7 mm 26 25 3.8 mm 24 3.9 mm 23 5/32 22 4.0 mm
Decimal Equivalent
[inches]
0.0785 0.0787 0.0807 0.0810 0.0820 0.0827 0.0846 0.0860 0.0866 0.0886 0.0890 0.0905 0.0925 0.0935 0.0937 0.0945 0.0960 0.0965 0.0980 0.0984 0.0995 0.1015 0.1024 0.1040 0.1063 0.1065 0.1093 0.1100 0.1102 0.1110 0.1130 0.1142 0.1160 0.1181 0.1200 0.1220 0.1250 0.1260 0.1285 0.1299 0.1339 0.1360 0.1378 0.1405 0.1406 0.1417 0.1440 0.1457 0.1470 0.1495 0.1496 0.1520 0.1535 0.1540 0.1562 0.1570 0.1575
Drill Size
21 20 4.1 mm 4.2 mm 19 4.3 mm 18 11/64 17 4.4 mm 16 4.5 mm 15 4.6 mm 14 13 4.7 mm 3/16 12 4.8 mm 11 4.9 mm 10 9 5.0 mm 8 5.1 mm 7 13/64 6 5.2 mm 5 5.3 mm 4 5.4 mm 3 5.5 mm 7/32 5.6 mm 2 5.7 mm 1 5.8 mm 5.9 mm A 15/64 6.0 mm B 6.1 mm C 6.2 mm D 6.3 mm E 1/4 6.4 mm 6.5 mm
Decimal Equivalent
[inches]
0.1590 0.1610 0.1614 0.1654 0.1660 0.1693 0.1695 0.1719 0.1730 0.1732 0.1770 0.1771 0.1800 0.1811 0.1820 0.1850 0.1850 0.1875 0.1890 0.1890 0.1910 0.1929 0.1935 0.1960 0.1968 0.1990 0.2008 0.2010 0.2031 0.2040 0.2047 0.2055 0.2087 0.2090 0.2126 0.2130 0.2165 0.2187 0.2205 0.2210 0.2244 0.2280 0.2283 0.2323 0.2340 0.2344 0.2362 0.2380 0.2401 0.2420 0.2441 0.2460 0.2480 0.2500 0.2500 0.2520 0.2559
Drill Size
F 6.6 mm
G 6.7 mm 17/64
H 6.8 mm 6.9 mm
I 7.0 mm
J 7.1 mm
K 9/32 7.2 mm 7.3 mm
L 7.4 mm
M 7.5 mm 19/64 7.6 mm
N 7.7 mm 7.8 mm 7.9 mm
5/16 8.0 mm
O 8.1 mm 8.2 mm
P 8.3 mm 21/64 8.4 mm
Q 8.5 mm 8.6 mm
R 8.7 mm 11/32 8.8 mm
S 8.9 mm 9.0 mm
T 9.1 mm 23/64 9.2 mm 9.3 mm
U 9.4 mm 9.5 mm
3/8 V 9.6 mm 9.7 mm
Decimal Equivalent
[inches]
0.2570 0.2598 0.2610 0.2638 0.2656 0.2660 0.2677 0.2716 0.2720 0.2756 0.2770 0.2795 0.2811 0.2812 0.2835 0.2874 0.2900 0.2913 0.2950 0.2953 0.2968 0.2990 0.3020 0.3031 0.3071 0.3110 0.3125 0.3150 0.3160 0.3189 0.3228 0.3230 0.3267 0.3281 0.3307 0.3320 0.3346 0.3386 0.3390 0.3425 0.3437 0.3465 0.3480 0.3504 0.3543 0.3580 0.3583 0.3594 0.3622 0.3661 0.3680 0.3701 0.3740 0.3750 0.3770 0.3780 0.3819
Drill Size
9.8 mm W
9.9 mm 25/64 10.0 mm
X 10.2 mm
Y 13/32
Z 10.5 mm
27/64 10.8 mm 11.0 mm
7/16 11.2 mm 11.5 mm
29/64 11.8 mm
15/32 12.0 mm 12.2 mm
31/64 12.5 mm
1/2 12.8 mm 13.0 mm
33/64 17/32 35/64 9/16 37/64 19/32
5/8 21/32 43/64 11/16 45/64 23/32 47/64
3/4 49/64 25/32 51/64 53/64 27/32 55/64
7/8 57/64 29/32 13/16 59/64 15/16 61/64 31/32 63/64
1
Decimal Equivalent
[inches]
0.3858 0.3860 0.3898 0.3906 0.3937 0.3970 0.4016 0.404 0.4062 0.4130 0.4133 0.4219 0.4252 0.4331 0.4375 0.4409 0.4528 0.4531 0.4646 0.4687 0.4724 0.4803 0.4844 0.4921 0.5000 0.5039 0.5118 0.5156 0.5312 0.5469 0.5625 0.5781 0.5937 0.6250 0.6562 0.6719 0.6875 0.7031 0.7187 0.7344 0.7500 0.7656 0.7812 0.7969 0.8281 0.8594 0.8594 0.8750 0.8906 0.9062 0.9125 0.9219 0.9375 0.9531 0.9687 0.9844 1.0000
These drill sizes are readily available OTS. In general, there are 3 categories of common imperial drill sizes: fractional (in 1/64" increments), lettered (A-Z), and numbered (1-80).
Generated by: K. Brooker
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