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Drills, Drills, Drills
"The only resource that you can change without limit is tools."
Notice that there is more than one drill shown for Tap and Clear. This
is because I found conflicting resources on this subject. I use the
smallest drill first. If you don't have the smallest listed then the next
larger is an "ok" alternative. You can make this hole too big and then
there won't be any threads. Clearance drills can be anything larger than
those shown but you don't want a lot of "wobble" in most cases.
| Decimal |
Fraction |
Number |
Letter |
Tap |
Tap Clear |
|
0.0135 |
|
80 |
|
|
|
|
0.0145 |
|
79 |
|
|
|
|
0.016 |
close to 1/64 (0.015625) |
78 |
|
|
|
|
0.018 |
|
77 |
|
|
|
|
0.019 |
|
76 |
|
|
|
|
0.02 |
|
76 |
|
|
|
|
0.021 |
|
75 |
|
|
|
|
0.0225 |
|
74 |
|
|
|
|
0.024 |
|
73 |
|
|
|
|
0.025 |
|
72 |
|
|
|
|
0.026 |
|
71 |
|
|
|
|
0.028 |
|
70 |
|
|
|
|
0.0292 |
|
69 |
|
|
|
|
0.031 |
close to 1/32 (0.03125), 2/64 |
68 |
|
|
|
|
0.032 |
|
67 |
|
|
|
|
0.033 |
|
66 |
|
|
|
|
0.035 |
|
65 |
|
|
|
|
0.036 |
|
64 |
|
|
|
|
0.037 |
|
63 |
|
|
|
|
0.038 |
|
62 |
|
00-90 |
|
|
0.039 |
|
61 |
|
|
|
|
0.04 |
|
60 |
|
00-90 |
|
|
0.041 |
|
59 |
|
|
|
|
0.042 |
|
58 |
|
|
|
|
0.043 |
|
57 |
|
|
|
|
0.0465 |
|
56 |
|
0-80 |
00-90 |
|
0.046875 |
3/64 |
|
|
|
|
|
0.052 |
(.0515) |
55 |
|
|
00-90 |
|
0.055 |
|
54 |
|
|
|
|
0.0595 |
|
53 |
|
|
1-42 |
|
0.0595 |
(.0585) |
53 |
|
1-72 |
|
|
0.0595 |
(.0615) |
53 |
|
|
|
|
0.0625 |
1/16, 2/32, 4/64 |
|
|
|
|
|
0.0635 |
|
52 |
|
|
0-80 |
|
0.067 |
|
51 |
|
|
0-80 |
|
0.07 |
|
50 |
|
2-56 |
|
|
0.073 |
|
49 |
|
|
2-32 |
|
0.076 |
|
48 |
|
|
1-72 |
|
0.0781 |
5/64 |
|
|
|
1-72 |
|
0.0785 |
|
47 |
|
3-48 |
1-72 |
|
0.081 |
|
46 |
|
|
|
|
0.082 |
|
45 |
|
|
3-28 |
|
0.086 |
|
44 |
|
|
|
|
0.089 |
|
43 |
|
|
2-56 |
|
0.0935 |
|
42 |
|
|
2-56 |
|
0.0938 |
3/32, 6/64 |
|
|
|
|
|
0.096 |
|
41 |
|
|
4-24 |
|
0.098 |
|
40 |
|
|
|
|
0.0995 |
|
39 |
|
|
|
|
0.1015 |
|
38 |
|
|
|
|
0.104 |
|
37 |
|
|
|
|
0.1065 |
|
36 |
|
|
5-20,3-48 |
|
0.1094 |
7/64 |
|
|
|
|
|
0.111 |
|
34 |
|
|
|
|
0.113 |
|
33 |
|
|
|
|
0.116 |
|
32 |
|
|
|
|
0.12 |
|
31 |
|
|
|
|
0.125 |
1/8, 2/16, 4/32, 8/64 |
|
|
|
|
|
0.1285 |
|
30 |
|
|
7-19 |
|
0.136 |
|
29 |
|
|
8-18 |
|
0.14 |
9/64 |
|
|
|
|
|
0.1405 |
|
28 |
|
|
|
|
0.144 |
|
27 |
|
|
|
|
0.147 |
|
26 |
|
|
|
|
0.1495 |
|
25 |
|
|
|
|
0.152 |
|
24 |
|
|
|
|
0.154 |
|
23 |
|
|
|
|
0.156 |
5/32, 10/64 |
|
|
|
|
|
0.157 |
|
22 |
|
|
|
|
0.159 |
|
21 |
|
|
10-16 |
|
0.161 |
|
20 |
|
|
|
|
0.166 |
|
19 |
|
|
|
|
0.1695 |
|
18 |
|
|
|
|
0.171 |
11/64 |
|
|
|
|
|
0.173 |
|
17 |
|
|
|
|
0.177 |
|
16 |
|
|
|
|
0.18 |
|
15 |
|
|
|
|
0.182 |
|
14 |
|
|
12-14 |
|
0.185 |
|
13 |
|
|
|
|
0.187 |
3/16, 6/32, 12/64 |
|
|
|
|
|
0.189 |
|
12 |
|
|
|
|
0.191 |
|
11 |
|
|
|
|
0.1935 |
|
10 |
|
|
|
|
0.196 |
|
9 |
|
|
|
|
0.199 |
|
8 |
|
|
|
|
0.201 |
|
7 |
|
|
|
|
0.203 |
13/64 |
|
|
|
|
|
0.204 |
|
6 |
|
|
|
|
0.2055 |
|
5 |
|
|
|
|
0.209 |
|
4 |
|
|
1/4-14 |
|
0.213 |
|
3 |
|
|
|
|
0.218 |
7/32, 14/64 |
|
|
|
|
|
0.221 |
|
2 |
|
|
|
|
0.228 |
|
1 |
|
|
|
|
0.234 |
|
|
A |
|
|
|
0.2344 |
15/64 |
|
|
|
|
|
0.238 |
|
|
B |
|
|
|
0.242 |
|
|
C |
|
|
|
0.246 |
|
|
D |
|
|
|
0.25 |
1/4, 2/8,4/16, 8/32, 16/64 |
|
E |
|
|
|
0.257 |
|
|
F |
|
|
|
0.261 |
|
|
G |
|
|
|
0.266 |
|
|
H |
|
|
|
0.272 |
|
|
I |
|
5/16-12 |
|
0.277 |
|
|
J |
|
|
|
0.281 |
|
|
K |
|
|
|
0.28125 |
9/32, 18/64 |
|
|
|
|
|
0.29 |
|
|
L |
|
|
|
0.295 |
|
|
M |
|
|
|
0.302 |
|
|
N |
|
|
|
0.3125 |
5/16, 10/32, 20/64 |
|
|
|
|
|
0.3125 |
5/16, 10/32, 20/64 |
18 |
|
|
|
|
0.316 |
|
|
O |
|
|
|
0.323 |
|
|
P |
|
|
|
0.332 |
|
|
Q |
|
3/8-12 |
|
0.339 |
|
|
R |
|
|
|
0.348 |
|
|
S |
|
|
|
0.358 |
|
|
T |
|
|
|
0.368 |
|
|
U |
|
|
|
0.375 |
3/8, 6/16, 12/32, 24/64 |
|
|
|
|
|
0.377 |
|
|
V |
|
|
|
0.386 |
|
|
|
|
7/16-10 |
|
0.386 |
|
|
W |
|
|
|
0.397 |
|
|
X |
|
|
|
0.404 |
|
|
Y |
|
|
|
0.413 |
|
|
Z |
|
|
|
0.4375 |
7/16,14/32,28/64 |
|
|
|
|
|
0.4531 |
"29/64" |
|
|
|
1/2-10 |
|
0.5 |
1/2,2/4,4/8,8/16,16/32,32/64 |
|
|
|
|
|
0.625 |
5/8, 10/16,20/32,40/64 |
|
|
|
|
|
0.75 |
3/4, 6/8,12/16,24/64 |
|
|
|
|
|
0.875 |
7/8, 14/16, 28/32, 56/64 |
|
|
|
|
|
1 |
1 |
|
|
|
|
|
1.125 |
1 1/8 |
|
|
|
|
|
1.25 |
1 1/4 |
|
|
|
|
|