AMERICAN NPSM FITTINGS

Hydraulic Fittings / American NPSM Standard

American NPSM Hydraulic FittingsNational Pipe Straight Mechanical Standard

NPSM (National Pipe Straight Mechanical)

NPSM (National Pipe Straight Mechanical) is an American standard for straight-thread hydraulic and pneumatic fittings. Unlike the tapered NPT standard, NPSM fittings use straight threads combined with a 60° cone seat design to create reliable leak-free connections.

The cone seat design is where the sealing action occurs, providing superior performance in high-pressure hydraulic systems. NPSM fittings are widely used in industrial applications where consistent, reliable connections are critical. They are compatible with standard American pipe dimensions and are available in multiple materials and surface treatments.

Our American NPSM fittings are manufactured to strict specifications, featuring precision-machined 60° cone seats and durable construction in carbon steel and stainless steel variants.