Steel Coupling/ Adaptor
Standards:
A105: Carbon Steel Forgings for Piping Applications. ANSI B1.1: -Unified Screw Threads spec. ASME B1.20.3: Dry seal pipe thread,NPT Thread - Surface: As Forged or Machined - Thread: NPT
Sample drawings:
Forging, then machined surface
NPT Thread (ASME B1.20.1):
