Thread Size |
Working Pressures |
||||
Nom Inch Tube O.D. | SAE J514 Flared Tube End and SAE J1926/3/ ISO 11926-3 O-Ring Port Thread Size (Notes 1&2) | 37 Deg. Flared Tube Ends, Unions and Bulkheads. | 37 Deg. Female Swivels. | ||
MPa | psi | MPa | psi | ||
1/8 | 5/16-24 UNF | 34.5 | 5,000 | 34.5 | 5,000 |
3/16 | 3/8-24 UNF | 34.5 | 5,000 | 34.5 | 5,000 |
1/4 |
7/16-20 UNF |
34.5 |
5,000 |
31 |
4,500 |
5/16 |
1/2-20 UNF |
34.5 |
5,000 |
27.5 |
4,000 |
3/8 |
9/16-18 UNF |
34.5 |
5,000 |
27.5 |
4,000 |
1/2 |
3/4-16 UNF |
31 |
4,500 |
27.5 |
4,000 |
5/8 |
7/8-14 UNF |
24 |
3,500 |
21 |
3,000 |
3/4 |
1-1/16-12 UN |
24 |
3,500 |
21 |
3,000 |
7/8 |
1-3/16-12 UN |
21 |
3,000 |
17 |
2,500 |
1 |
1-5/16-12 UN |
21 |
3,000 |
17 |
2,500 |
1 1/4 |
1-5/8-12 UN |
17 |
2,500 |
14 |
2,000 |
1 1/2 |
1-7/8-12 UN |
14 |
2,000 |
10.5 |
1,500 |
2 |
2-1/2-12 UN |
10.5 |
1,500 |
8 |
1,125 |
Thread Size |
Working Pressures |
||
Nom Inch Pipe O.D. |
Dryseal Pipe Thread (NPTF) Male and Female |
Fittings With NPTF Pipe Threads |
|
|
|
MPa |
psi |
1/8 |
1/8-27 |
34.5 |
5,000 |
1/4 |
1/4-18 |
27.5 |
4,000 |
3/8 |
3/8-18 |
21 |
3,000 |
1/2 |
1/2-14 |
21 |
3,000 |
3/4 |
3/4-14 |
17 |
2,500 |
1 |
1-11-1/2 |
14 |
2,000 |
1 1/4 |
1-1/4-11-1/2 |
8 |
1,150 |
1 1/2 |
1-1/2-11-1/2 |
7 |
1,000 |
2 |
2-11-1/2 |
7 |
1,000 |
Table ST1. Pressure Ratings for 37 Deg. Flared Tube Ends, Unions, Bulkheads and 37 Deg. Female Swivels |
|||||
Nominal Tube Size |
Thread Size |
Working Pressures |
|||
Nom Inch |
SAE J514 Flared Tube End and SAE J1926/3/ ISO 11926-3 O-Ring Port Thread Size (Notes 1&2) |
37 Deg. Flared Tube Ends, Unions and Bulkheads |
37 Deg. Female Swivels |
||
|
|
MPa |
psi |
MPa |
psi |
1/8 |
5/16-24 UNF |
34.5 |
5,000 |
34.5 |
5,000 |
3/16 |
3/8-24 UNF |
34.5 |
5,000 |
34.5 |
5,000 |
1/4 |
7/16-20 UNF |
34.5 |
5,000 |
31 |
4,500 |
5/16 |
1/2-20 UNF |
34.5 |
5,000 |
27.5 |
4,000 |
3/8 |
9/16-18 UNF |
34.5 |
5,000 |
27.5 |
4,000 |
1/2 |
3/4-16 UNF |
31 |
4,500 |
27.5 |
4,000 |
5/8 |
7/8-14 UNF |
24 |
3,500 |
21 |
3,000 |
3/4 |
1-1/16-12 UN |
24 |
3,500 |
21 |
3,000 |
7/8 |
1-3/16-12 UN |
21 |
3,000 |
17 |
2,500 |
1 |
1-5/16-12 UN |
21 |
3,000 |
17 |
2,500 |
1 1/4 |
1-5/8-12 UN |
17 |
2,500 |
14 |
2,000 |
1 1/2 |
1-7/8-12 UN |
14 |
2,000 |
10.5 |
1,500 |
2 |
2-1/2-12 UN |
10.5 |
1,500 |
8 |
1,125 |
Table ST2. Pressure Ratings for Fittings With NPTF Pipe Threads |
|||||
Nominal Pipe Size |
Thread Size |
Working Pressures |
|||
Nom Inch |
Dryseal Pipe Thread (NPTF1) Male and Female |
Fittings With NPTF Pipe Threads |
|||
MPa | psi | ||||
1/8 |
1/8-27 |
34.5 |
5,000 |
||
1/4 |
1/4-18 |
27.5 |
4,000 |
||
3/8 |
3/8-18 |
21 |
3,000 |
||
1/2 |
1/2-14 |
21 |
3,000 |
||
3/4 |
3/4-14 |
17 |
2,500 |
||
1 |
1-11-1/2 |
14 |
2,000 |
||
1 1/4 |
1-1/4-11-1/2 |
8 |
1,150 |
||
1 1/2 |
1-1/2-11-1/2 |
7 |
1,000 |
||
2 |
2-11-1/2 |
7 |
1,000 |