Pipe thread references quoted in this page conform with the requirements specified in the latest issue and amendments of the following ISO Standards:
- ISO 7-1 (BS21) Pipe threads for tubes and fittings where pressure-tight joints are made on the threads (requires PTFE sealing tape or liquid sealant).
- ISO 228-1 (BS2779) Pipe threads for tubes and fittings where pressure-tight joints are not made on the threads (requires a sealing washer such as a bonded seal or ‘O’ ring).
References to pipe threads are in accordance with ISO 7 as follows:
|BS 21||BS 2779|
|Rc* = BSP Taper Female||G* = BSP Parallel Female|
|R* = BSP Taper Male||G*A = BSP Parallel Male|
|Rp = BSP Parallel Female|