FORJAY Machine Shop

Tap Drill Sizes (inch)
Tap Size TPI Thread Form Tap Drill
- 80 - 3/64
1 64
72
UNC
UNF
53
53
2 56
64
UNC
UNF
50
50
3 48
56
UNC
UNF
47
45
4 36
40
48
UNS
UNC
UNF
44
43
42
5 40
44
UNC
UNF
38
37
6 32
40
UNC
UNF
36
33
8 32
36
UNC
UNF
29
29
10 24
32
UNC
UNF
25
21
12 24
28
UNC
UNF
16
14
1/4 20
28
UNC
UNF
7
3
5/16 18
24
UNC
UNF
F
1
3/8 16
24
UNC
UNF
5/16
Q
7/16 14
20
UNC
UNF
U
25/64
1/2 13
20
UNC
UNF
27/64
29/64
9/16 12
18
UNC
UNF
31/64
33/64
5/8 11
18
UNC
UNF
17/32
37/64
11/16 11
16
UNC
UNF
19/32
5/8
3/4 10
16
UNC
UNF
21/32
11/16
7/8 9
14
UNC
UNF
49/64
13/16
1" 8
12
14
UNC
UNF
UNS
7/8
59/64
15/16
1 1/8 7
12
UNC
UNF
63/64
1 3/64
1 1/4 7
12
UNC
UNF
1 7/64
1 11/64
1 3/8 6
12
UNC
UNF
1 7/32
1 19/64
1 1/2 6
12
UNC
UNF
1 11/32
1 27/64