National Pipe Thread: Tapered threading for sealing for connection in nearly every type of service, use a sealing compound for a leak proof joint
National Fine Thread or Unified National Fine Thread: Uses to designate a straight, not tapered, thread for free-fitting mechanical joints for fixtures with an o-ring for complete sealant
British Standard Taper Pipe Threading (metric dimensions): An appropriate sealing compound can be used in the thread to ensure a leakproof joint. It is a standard screw thread type that has been adopted worldwide, except in the U.S. where NPT is standard
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