|
BA |
BSC |
BSF |
BSP |
BSTP |
BSW |
CEI |
UNC |
UNF |
ME |
BSB
UNC - Unified Course Thread
diameter
in
inches |
T
P I |
Pitch |
Major
Diameter |
Root
Diameter
Internal Threads |
Root
Diameter
External Threads |
Tapping
Drill Size |
| number
1 |
64 |
0.0156 |
0.073 |
0.0561 |
0.0538 |
1.55
mm
(0.610 inch) |
| number
2 |
56 |
0.0179 |
0.086 |
0.0667 |
0.0641 |
Number
Drill 49
(1.85 mm) |
| number
3 |
48 |
0.0208 |
0.099 |
0.0764 |
0.0734 |
Number
Drill 45
(2.1 mm) |
| number
4 |
40 |
0.025 |
0.112 |
0.0849 |
0.0813 |
2.35
mm
(0.0925 inch) |
| number
5 |
40 |
0.025 |
0.125 |
0.0979 |
0.0943 |
Number
Drill 37
(2.65 mm) |
| number
6 |
32 |
0.0313 |
0.138 |
0.1042 |
0.0997 |
Number
Drill 34
(2.85 mm) |
| number
8 |
32 |
0.0313 |
0.164 |
0.1302 |
0.1257 |
3.5
mm
(0.1339 inch) |
| number
10 |
24 |
0.0417 |
0.19 |
0.1449 |
0.1389 |
Number
Drill 24
(3.9 mm) |
| number
12 |
24 |
0.0417 |
0.216 |
0.1709 |
0.1649 |
4.55
mm
(0.1791 inch) |
| 1/4 |
20 |
0.05 |
_ |
0.1959 |
0.1887 |
Number
Drill 7
(5.2 mm) |
| 5/16 |
18 |
0.0556 |
_ |
0.2524 |
0.2443 |
Letter
Drill G
(6.6 mm) |
| 3/8 |
16 |
0.0625 |
_ |
0.3073 |
0.2983 |
Letter
Drill O
(8 mm) |
| 7/16 |
14 |
0.0714 |
_ |
0.3602 |
0.3499 |
9.4
mm
(0.3701 inch) |
| 1/2 |
13 |
0.0769 |
_ |
0.4167 |
0.4056 |
10.8
mm
(0.4252 inch) |
| 9/16 |
12 |
0.0833 |
_ |
0.4723 |
0.4603 |
12.2
mm
(0.4803 inch) |
| 5/8 |
11 |
0.0909 |
_ |
0.5266 |
0.5135 |
17/32
inch
(13.49 mm) |
| 3/4 |
10 |
0.1 |
_ |
0.6417 |
0.6273 |
16.5
mm
(0.6496 inch) |
| 7/8 |
9 |
0.1111 |
_ |
0.7547 |
0.7387 |
49/64
inch
(19.45 mm) |
| 1
inch |
8 |
0.125 |
_ |
0.8647 |
0.8466 |
22.25
mm
(0.8760 inch) |
|
|
