| Product | Threaded full coupling, forged steel |
|---|---|
| Design standard | ASME B16.11 (forged fittings, socket-welding and threaded) |
| Connection | Female NPT × female NPT, through-bore |
| Thread | NPT per ASME B1.20.1 (tapered thread) |
| Configuration | Full coupling (equal and reducing versions subject to availability) |
| Pressure class | Class 2000, 3000 and 6000 (stocked classes on enquiry) |
| Size range | NPS 1/8 to NPS 4 (Class 6000 typically up to NPS 2); stocked sizes on enquiry |
| Wall equivalence | Class 2000 = Sch 40, Class 3000 = Sch 80, Class 6000 = Sch 160 |
| Material | Forged carbon steel ASTM A105; other grades listed in the Materials & Variants tab |
| Installation note | Apply PTFE tape or thread sealant to NPT threads and avoid over-tightening, which can crack the female fitting |
| How to order | Please state the size, pressure class, material grade and quantity when requesting a quote. Stocked sizes, classes and grades vary, so please confirm availability. Material test certificates (MTC) are provided with every shipment. |
Pressure class guide
| Class | Wall equivalent | Typical size range |
|---|---|---|
| Class 2000 | Schedule 40 | NPS 1/8 to NPS 4 |
| Class 3000 | Schedule 80 | NPS 1/8 to NPS 4 |
| Class 6000 | Schedule 160 | NPS 1/8 to NPS 2 |
Class is the approximate cold working pressure in psi. Allowable pressure falls as temperature rises, so please check the ASME B16.11 pressure-temperature ratings for your service.
