NPSM
NPSM (National Pipe Straight Mechanical) is a parallel (straight) pipe thread standard used primarily in low-pressure fluid and mechanical applications. Unlike NPT (National Pipe Tapered), NPSM does not provide a sealing function by itself. Instead, it relies on a sealing gasket, O-ring, or mating tapered seat to prevent leaks.
Characteristics:
- Thread Type: Straight (parallel)
- Thread Angle: 60°
- Sealing Method: Requires a gasket, O-ring, or tapered seat for sealing
- Applications: Hydraulic systems, fuel lines, plumbing, low-pressure fluid connections
- Advantages:
- Does not deform upon tightening, making it reusable
- Easier to assemble and disassemble than tapered threads
- Common in non-pressurized and low-pressure fluid applications
NPSM threads are widely used in hydraulic fittings, plumbing, and industrial fluid applications where a reliable, but non-sealing thread is required.



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