Fitting Threads - Parker Hannifin
Metric Threads This is an American standard taper thread which fits into the matching taper port. Sealing is provided by a pre-coating on the thread. Example: 1/8 NPT thread = 1/8 NPT These ISO-profile threads are parallel and are fit into the matching parallel port. Sealing is provided by an O-ring or a sealing washer. Thread designation