** Pipe thread DIN ISO 228, Part 1**
- Short code: G
- Description: ISO 228-G1/8, G1/4, G1/2, G3/4, G1 etc.
- Type of thread: internal thread cylindrical, external thread cylindrical (tolerance class A)
For mechanical connection of fittings and valves. The connection is sealed by pressing two sealing surfaces against each other outside the threads and by placing a suitable seal.
** Pipe thread according to EN 10226 ( former) DIN 2999 **.
- Short code: Rp
- Description: EN 10226-Rp1/2, Rp3/4, Rp1 etc.
- Type of thread: Cylindrical internal thread
** Pipe thread conical**
- Short code: NPT
- Basis: ANSI B 1.20.1
The National Taper Pipe (NPT) thread type is a conical pipe thread used for pipe fittings. The internal and external threads of the NPT are conical. The NPT thread is only self-sealing at low pressure and if it is not subjected to strong temperature fluctuations. Therefore, it is recommended to use additional sealing material.