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Main Menu
Mechanical Menu
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Standard PCB Drill Size Chart
NUMBERED DRILLS AND FRACTIONS OF
INCHES
|
Drill
No. |
Inches |
|
Drill
No. |
Inches |
|
Drill
No. |
Inches |
|
85 |
.011 |
|
53 |
.0595 |
|
9/64 |
.140625 |
|
84 |
.0115 |
|
1/16 |
.0625 |
|
27 |
.144 |
|
83 |
.012 |
|
52 |
.0635 |
|
26 |
.147 |
|
82 |
.0125 |
|
|
|
|
|
|
|
81 |
.013 |
|
51 |
.067 |
|
25 |
.1495 |
|
80 |
.0135 |
|
50 |
.070 |
|
24 |
.152 |
|
79 |
.0145 |
|
49 |
.073 |
|
23 |
.154 |
|
1/64 |
.015625 |
|
48 |
.076 |
|
5/32 |
.15625 |
|
78 |
.016 |
|
5/64 |
.078125 |
|
22 |
.157 |
|
77 |
.018 |
|
47 |
.0785 |
|
21 |
.159 |
|
76 |
.020 |
|
46 |
.081 |
|
20 |
.161 |
|
75 |
.021 |
|
45 |
.082 |
|
19 |
.166 |
|
74 |
.0225 |
|
44 |
.086 |
|
18 |
.1695 |
|
73 |
.024 |
|
43 |
.089 |
|
11/64 |
.171875 |
|
72 |
.025 |
|
42 |
.0935 |
|
17 |
.173 |
|
71 |
.026 |
|
3/32 |
.09375 |
|
16 |
.177 |
|
70 |
.028 |
|
41 |
.096 |
|
15 |
.180 |
|
69 |
.0292 |
|
|
|
|
|
|
|
68 |
.031 |
|
40 |
.098 |
|
14 |
.182 |
|
1/32 |
.03125 |
|
39 |
.0995 |
|
13 |
.185 |
|
67 |
.032 |
|
38 |
.1015 |
|
3/16 |
.1875 |
|
66 |
.033 |
|
37 |
.104 |
|
12 |
.189 |
|
65 |
.035 |
|
36 |
.1065 |
|
11 |
.191 |
|
64 |
.036 |
|
7/64 |
.109375 |
|
10 |
.1935 |
|
63 |
.037 |
|
|
|
|
09 |
.196 |
|
62 |
.038 |
|
35 |
.110 |
|
08 |
.199 |
|
61 |
.039 |
|
34 |
.111 |
|
07 |
.201 |
|
60 |
.040 |
|
33 |
.113 |
|
13/64 |
.203125 |
|
59 |
.041 |
|
32 |
.116 |
|
06 |
.204 |
|
58 |
.042 |
|
31 |
.120 |
|
05 |
.2055 |
|
57 |
.043 |
|
1/8 |
.125 |
|
04 |
.209 |
|
56 |
.0465 |
|
30 |
.1285 |
|
03 |
.213 |
|
3/64 |
.046875 |
|
|
|
|
7/32 |
.21875 |
|
55 |
.052 |
|
29 |
.136 |
|
02 |
.221 |
|
54 |
.055 |
|
28 |
.1405 |
|
01 |
.228 |
LETTER DRILLS AND
FRACTIONS OF INCHES (UNDER CONSTRUCTION)
|
Drill No. |
Inches |
|
Drill No. |
Inches |
|
Drill No. |
Inches |
|
A |
.234 |
|
27/64 |
.421875 |
|
|
|
|
15/64 |
.234375 |
|
7/16 |
.4375 |
|
|
|
|
B |
.238 |
|
29/64 |
.453125 |
|
|
|
|
C |
.242 |
|
15/32 |
.46875 |
|
|
|
|
D |
.246 |
|
31/64 |
.484375 |
|
|
|
|
E |
.250 |
|
1/2 |
.500 |
|
|
|
|
1/4 |
.250 |
|
33/64 |
.515625 |
|
|
|
|
F |
.257 |
|
17/32 |
.53125 |
|
|
|
|
G |
.261 |
|
35/64 |
.546875 |
|
|
|
|
17/64 |
.265625 |
|
9/16 |
.5625 |
|
|
|
|
H |
.266 |
|
37/64 |
.578125 |
|
|
|
|
I |
.272 |
|
|
|
|
|
|
|
J |
.277 |
|
|
|
|
|
|
|
K |
.281 |
|
|
|
|
|
|
|
9/32 |
.28125 |
|
|
|
|
|
|
| |
|
|
|
|
|
|
|
|
L |
.290 |
|
|
|
|
|
|
|
M |
.295 |
|
|
|
|
|
|
|
19/64 |
.296875 |
|
|
|
|
|
|
|
N |
.302 |
|
|
|
|
|
|
|
5/16 |
.3125 |
|
|
|
|
|
|
|
O |
.316 |
|
|
|
|
|
|
|
P |
.323 |
|
|
|
|
|
|
|
21/64 |
.328125 |
|
|
|
|
|
|
|
Q |
.332 |
|
|
|
|
|
|
|
R |
.339 |
|
|
|
|
|
|
|
11/32 |
.34375 |
|
|
|
|
|
|
|
S |
.348 |
|
|
|
|
|
|
|
T |
.358 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
23/64 |
.359375 |
|
|
|
|
|
|
|
U |
.368 |
|
|
|
|
|
|
|
3/8 |
.375 |
|
|
|
|
|
|
|
V |
.377 |
|
|
|
|
|
|
|
W |
.386 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
25/64 |
.390625 |
|
|
|
|
|
|
|
X |
.397 |
|
|
|
|
|
|
|
Y |
.404 |
|
|
|
|
|
|
|
13/32 |
.40625 |
|
|
|
|
|
|
|
Z |
.413 |
|
|
|
|
|
|
|
|
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