NUMBER OF PASSES FOR CUTTING VARIOUS THREADS |
|||||
thread size |
easy machining |
|
average machining
|
|
difficult machining |
#2-56 |
2 |
|
3 |
|
3 |
|
|
|
|
|
|
#4-40 |
2 |
|
3 |
|
3 |
#5-40 |
2 |
|
3 |
|
3 |
|
|
|
|
|
|
#6-32 |
2 |
|
2 |
|
3 |
#8-32 |
2 |
|
2 |
|
3 |
|
|
|
|
|
|
#10-24 |
2 |
|
2 |
|
3 |
#10-32 |
1 |
|
2 |
|
2 |
|
|
|
|
|
|
#12-24 |
2 |
|
2 |
|
3 |
#12-28 |
1 |
|
2 |
|
2 |
|
|
|
|
|
|
1/4-20 |
2 |
|
2 |
|
3 |
1/4-28 |
1 |
|
1 |
|
2 |
|
|
|
|
|
|
5/16-18 |
2 |
|
2 |
|
3 |
5/16-24 |
1 |
|
1 |
|
2 |
|
|
|
|
|
|
3/8-16 |
2 |
|
2 |
|
3 |
3/8-24 |
1 |
|
1 |
|
2 |
|
|
|
|
|
|
7/16-14 |
2 |
|
2 |
|
3 |
7/16-20 |
1 |
|
1 |
|
2 |
|
|
|
|
|
|
1/2-13 |
2 |
|
2 |
|
3 |
1/2-20 |
1 |
|
1 |
|
2 |
|
|
|
|
|
|
9/16-12 |
2 |
|
2 |
|
3 |
9/16-18 |
1 |
|
2 |
|
2 |
|
|
|
|
|
|
5/8-11 |
2 |
|
2 |
|
3 |
5/8-18 |
1 |
|
2 |
|
2 |
|
|
|
|
|
|
3/4-10 |
2 |
|
2 |
|
3 |
3/4-16 |
1 |
|
2 |
|
2 |
|
|
|
|
|
|
7/8-9 |
2 |
|
2 |
|
3 |
7/8-14 |
1 |
|
2 |
|
2 |
|
|
|
|
|
|
1"-8 |
2 |
|
3 |
|
4 |
1"-12 |
2 |
|
2 |
|
2 |
1"-14 |
2 |
|
2 |
|
2 |
|
|
|
|
|
|
1/16 NPT | 1 | 1 | 2 | ||
1/8 NPT | 1 | 1 | 2 | ||
1/4 NPT | 1 | 1 | 2 | ||
3/8 NPT | 1 | 1 | 2 | ||
1/2 NPT | 1 | 2 | 3 | ||
3/4 NPT | 1 | 2 | 3 | ||
1" NPT | 1 | 2 | 3 | ||
1-1/4" NPT | 1 | 2 | 3 | ||
1-1/2" NPT | 1 | 2 | 3 | ||
2" NPT | 1 | 2 | 3 | ||
2-1/2 | 2 | 3 | 4 | ||
3" | 2 | 3 | 4 | ||
3-1/2 | 2 | 3 | 4 | ||
4" | 2 | 3 | 4 | ||
5" | 2 | 3 | 4 | ||
6" | 2 | 3 | 4 |
Easy machining materials: Non ferrous and leaded steels | |||||
Average machining materials: Carbon and alloy steels up to 30 Rc, 300 & 400 series stainless | |||||
Difficult machining materials: Inconels, harder steels, titanium, 17-4PH stainless |