NPT Female Swivel Hydraulic Adapters is also called NPSM female swivel hydraulic fittings. It is a straight thread and a 30° cone to create a mechanical seal with NPTF pipe male fittings.

QC Hydraulics manufactures NPT Female Swivel Hydraulic Adapters that is permanently attached to the body and mates with a male pipe thread that has a 30° seat (chamfer) machined into the end of it. The threads bring both 30° seats (flare and chamfer) together creating a metal-to-metal seal. Size available from 1/4” to 2”. Material available in SS 304 and SS 316L.