NPT pipe thread adapter hydraulic fittings use a NPTF, National Pipe Tapered Fuel, which is equivalent to NPT National Pipe Taper.

NPSM (National Pipe Straight Mechanical) are female swivel pipe fittings with a straight thread& a 30 degree cone.

JIC 37 adapter fittings have a 37 degree cone seat on the female adapter& a 37 degree flare on the male adapter.

O-Ring Boss adapter fittings are an excellent choice for medium& high pressure applications.

The O Ring Face Seal adapter fittings use a straight thread with a machined groove in the face of the male fitting to accept an O Ring.