National Coarse
| Holds
Sizes |
| Tap |
Drill |
6-32
8-32
10-24
10-32
1/4-20
5/16-18
3/8-16
7/16-14
1/2-13 |
|
#36
#29
#25
#21
#7
F
5/16
U
27/64 |
|
|
National Fine
| Holds
Sizes |
| Tap |
Drill |
6-40
8-36
10-24
10-32
1/4-28
5/16-24
3/8-24
7/16-20
1/2-20 |
|
#33
#29
#25
#21
#3
I
Q
25/64
29/64 |
|
|
Metric
| Holds
Sizes |
| Tap |
Drill |
2.5
x 0.45
3.0 x 0.50
3.5 x 0.60
4.0 x 0.70
5.0 x .080
6.0 x 1.00
8.0 x 1.25
10.0 x 1.50
12.0 x 1.75 |
|
2.05
mm
2.50 mm
2.90 mm
3.30 mm
4.20 mm
5.00 mm
6.70 mm
8.50 mm
10.20 mm |
|
|
