NPSM Straight Couplings 10in from forwell
NPT (national pipe thread) American general sealing round tapered pipe thread
NPTF (national pipe tape) American Standard Dryseal taper pipe thread
NPSM (American standard straight pipe thread for me mechanical joints)
NPSM is the code name of American non sealing cylindrical pipe thread with 60 degree profile angle. There are three other American non sealing pipe threads. Their codes are NPTR, npsl, and NPSH. Their tooth form angle is 60 degrees.
G thread is the code of British non sealing cylindrical pipe thread, and the tooth profile angle is 55 degrees.
