Threaded full couplings are used to connect ends of threaded pipes in non critical services like air, water etc. They allow easy dismantling and because they do not need welding, they can be installed in running plants. They are used in small bore piping networks up to size 2″, though fittings up to 4″ size are available as per ASME B16.11 : Forged Fittings, Socket Welding and Threaded. These fittings are available in two pressure ratings viz. 3000# and 6000#. This page provides inch dimensions for 6000# rating threaded full Couplings.
Available Dimensions are: B | Length of Thread (Min), D | Outside Diameter, W | End to End Dimension, L2 | Length of Thread (Min).
| NPS | W | D | B | L2 |
|---|---|---|---|---|
| 1/8 | 1.25 | 0.88 | 0.25 | 0.2639 |
| 1/4 | 1.38 | 1.00 | 0.32 | 0.4018 |
| 3/8 | 1.50 | 1.25 | 0.36 | 0.4078 |
| 1/2 | 1.88 | 1.50 | 0.43 | 0.5337 |
| 3/4 | 2.00 | 1.75 | 0.50 | 0.5457 |
| 1 | 2.38 | 2.25 | 0.58 | 0.6828 |
| 1-1/4 | 2.62 | 2.50 | 0.67 | 0.7068 |
| 1-1/2 | 3.12 | 3.00 | 0.70 | 0.7235 |
| 2 | 3.38 | 3.62 | 0.75 | 0.7565 |
| 2-1/2 | 3.62 | 4.25 | 0.93 | 1.1380 |
| 3 | 4.25 | 5.00 | 1.02 | 1.2000 |
| 4 | 4.75 | 6.25 | 1.09 | 1.3000 |
| NPS | W | D | B | L2 |
General Notes
Dimensions are in inches.
Notes
- Dimension B is minimum length of perfect thread. The length of useful thread (B plus threads with fully formed roots and flat crests) shall not be less than L2 (effective length of external thread) required by American National Standard for Pipe Threads (ANSI/ASME B1.20.1). See Section 6.3.
- Class 2000 and DN6 Class 6000 couplings, half couplings, and caps are not included in ASME B16.11.
