On this page 5 sections
Key features of couplings
- Full, half and reducing couplings
- Socket-weld and threaded (NPT/BSP)
- Class 3000 / 6000 / 9000
- Forged from bar or forgings
Couplings by material
Couplings are available in the following grades. Select a grade for specifications and sizes.
Stainless Steel
- SS 304 Couplings
- SS 304L Couplings
- SS 304H Couplings
- SS 309S Couplings
- SS 310S Couplings
- SS 316 Couplings
- SS 316L Couplings
- SS 316Ti Couplings
- SS 317 Couplings
- SS 317L Couplings
- SS 321 Couplings
- SS 321H Couplings
- SS 347 Couplings
- SS 347H Couplings
- SS 904L Couplings
- Duplex 2205 Couplings
- Super Duplex 2507 Couplings
- SS 254 SMO Couplings
Nickel Alloys
- Inconel 600 Couplings
- Inconel 601 Couplings
- Inconel 625 Couplings
- Incoloy 800 Couplings
- Incoloy 800H Couplings
- Incoloy 800HT Couplings
- Incoloy 825 Couplings
- Monel 400 Couplings
- Hastelloy C22 Couplings
- Hastelloy C276 Couplings
- Nickel 200 Couplings
- Nickel 201 Couplings
Carbon Steel
Alloy Steel
Non-Ferrous Metals
Couplings: sizes, finishes and testing
- Size range
- Butt-weld ½" – 48" (larger fabricated to order) in schedules matching the pipe; socket-weld and threaded ⅛" – 4" in Class 2000, 3000, 6000 and 9000
- Finish
- Annealed & pickled, shot-blasted, black painted or galvanised (by material)
- Ends
- Bevelled (butt-weld), socket-weld, threaded NPT/BSP
Testing & documents
- Chemical and mechanical tests of the starting material
- Dimensional inspection to B16.9 / B16.11
- Radiography of welded fittings (seamed WPW/WX)
- Hardness, IGC and impact tests as specified
- EN 10204 3.1 certificate; 3.2 with third-party inspection
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Other fittings types
Frequently asked questions
What sizes are couplings available in?
Butt-weld ½" – 48" (larger fabricated to order) in schedules matching the pipe; socket-weld and threaded ⅛" – 4" in Class 2000, 3000, 6000 and 9000.
Which specifications cover couplings?
The product specification for the grade, with dimensions to the relevant ASME or EN standard.
What are couplings used for?
Socket-weld and threaded (NPT/BSP). Forged couplings follow ASME B16.11 in Classes 3000, 6000 and 9000.
Which materials are couplings available in?
Stainless steel, nickel alloys, carbon and alloy steel and non-ferrous metals, depending on the specification. See the material list above.