Threaded Coupling
Threaded Coupling Manufacturer & Supplier
A Threaded Coupling is a short length of pipe with internal threads on both ends, designed to connect two male-threaded pipes in a straight line. It ensures a secure, leak-proof joint without welding, making it ideal for low-pressure piping systems and maintenance applications.
| Feature | Threaded Coupling Description |
|---|---|
| Purpose | Connects two pipes with external threads to extend a pipeline or join pipes of the same or different diameters. |
| Standards | ASME B16.11, BS 3799, ISO 4144, ANSI/ASME B1.20.1 (NPT), BSPT, BSPP |
| Size Range | 1/8″ to 4″ (NPS) |
| Pressure Classes | Class 2000, 3000, 6000, 9000 |
| Thread Types | NPT (National Pipe Thread), BSPT (British Standard Pipe Taper), BSPP (British Standard Pipe Parallel), PT, PF |
| Types | – Full Coupling: Connects two pipes of the same diameter. – Half Coupling: Threaded on one end, welded or fixed on the other. – Reducing Coupling: Connects pipes of different diameters. |
| Materials | – Stainless Steel: ASTM A182 F304, F316, F316L, F321, F347, F904L – Carbon Steel: ASTM A105, A350 LF2 – Alloy Steel: ASTM A182 F5, F9, F11, F22, F91 – Duplex/Super Duplex: ASTM A182 F51, F53, F55 – Copper Alloys: ASTM SB 111 (C10100, C10200, etc.) – Nickel Alloys: Inconel, Monel, Hastelloy – Others: Brass, Malleable Iron, Cast Iron |
| Applications | – Oil & gas, petrochemical, chemical processing, plumbing, HVAC, water supply, power plants – Suitable for small-diameter, high-pressure systems (NPS 2 or smaller) – Used for pipe extensions, repairs, or transitions between pipe sizes |
| Connection Types | Threaded (Female/Female for full/reducing couplings; Female/Welded for half couplings) |
| Key Features | – Provides a secure, leak-proof connection – Easy to install and disassemble for maintenance – Corrosion-resistant materials (e.g., stainless steel, brass) for harsh environments – Reducing couplings allow connection of different pipe sizes |
| Common Issues | – Potential for leaks if threads are not properly sealed – Wear in abrasive or corrosive environments – Thread damage during installation can compromise integrity |
| Sealing Types | NPT (60° thread angle, tapered), BSPP (parallel threads), BSPT (tapered) |
| Typical Industries | Oil & gas, chemical processing, plumbing, HVAC, marine, agriculture, food & beverage |
Dimensions Threaded Full and Half Couplings
Class 3000
| NPS | Length | Outside Dia | Min Thread Length | |
| A | D | B | J | |
| 1/2 | 48 | 28 | 10.9 | 13.6 |
| 3/4 | 51 | 35 | 12.7 | 13.9 |
| 1 | 60 | 44 | 14.7 | 17.3 |
| 1.1/4 | 67 | 57 | 17 | 18 |
| 1.1/2 | 79 | 64 | 17.8 | 18.4 |
| 2 | 86 | 76 | 19 | 19.2 |
| 2.1/2 | 92 | 92 | 23.6 | 28.9 |
| 3 | 108 | 108 | 25.9 | 30.5 |
| 4 | 121 | 140 | 27.7 | 33 |
Class 6000
| NPS | Length | Outside Dia | Min Thread Length | |
| A | D | B | J | |
| 1/2 | 48 | 38 | 10.9 | 13.6 |
| 3/4 | 51 | 44 | 12.7 | 13.9 |
| 1 | 60 | 57 | 14.7 | 17.3 |
| 1.1/4 | 67 | 64 | 17 | 18 |
| 1.1/2 | 79 | 76 | 17.8 | 18.4 |
| 2 | 86 | 92 | 19 | 19.2 |
| 2.1/2 | 92 | 108 | 23.6 | 28.9 |
| 3 | 108 | 127 | 25.9 | 30.5 |
| 4 | 121 | 159 | 27.7 | 33 |
Types of Threaded Couplings
Full Coupling
Threads on both ends.
Half Coupling
Threaded only on one end.
Typically welded or socketed on the other end to connect to equipment or a larger system.
Reducing Coupling
Joins pipes of different diameters.
One end has a larger thread size than the other.
Key Features
Connection Type: Female NPT or BSP Threads
Material: Stainless Steel, Carbon Steel, Alloy Steel, Brass, etc.
Pressure Ratings: Class 2000 / 3000 / 6000
Standards: ASME B16.11, MSS SP-79, BS 3799
Size Range: 1/8” to 4” (DN6 to DN100)
Applications
Plumbing and HVAC systems
Oil & gas transmission
Firefighting pipelines
Chemical and petrochemical industries