| |
UNC
(Unified National Coarse)
|
|
| |
SIZE
|
THREADS
per INCH
|
TAP
DRILL SIZE (mm)
|
No.1
|
64
|
1.55
|
No.2
|
56
|
1.85
|
No.3
|
48
|
2.10
|
No.4
|
40
|
2.35
|
No.5
|
40
|
2.65
|
No.6
|
32
|
2.85
|
No.8
|
32
|
3.50
|
No.10
|
24
|
3.90
|
No.12
|
24
|
4.50
|
1/4"
|
20
|
5.10
|
5/16"
|
18
|
6.60
|
3/8"
|
16
|
8.00
|
7/16"
|
14
|
9.40
|
1/2"
|
13
|
10.80
|
9/16"
|
12
|
12.20
|
5/8"
|
11
|
13.50
|
3/4"
|
10
|
16.50
|
7/8"
|
9
|
19.50
|
1"
|
8
|
22.25
|
1.1/8"
|
7
|
25.00
|
1.1/4"
|
7
|
28.00
|
1.3/8"
|
6
|
30.75
|
1.1/2"
|
6
|
34.00
|
1.3/4"
|
5
|
39.50
|
2"
|
4.5
|
45.00
|
|
|
|
|
|
|
|
|
|
