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NPSF

NPSF (National Pipe Straight Fuel) is a parallel (straight) pipe thread designed for dry-seal applications, commonly used in fuel and hydraulic systems where leak-free connections are required without the use of additional sealing compounds. Unlike NPSM, which requires a gasket or O-ring, NPSF relies on precision fitting into an internally tapered seat to create a seal.

Characteristics:

  • Thread Type: Straight (parallel)
  • Thread Angle: 60°
  • Sealing Method: Seals through a precision fit with an internally tapered seat (dry-seal)
  • Applications: Fuel systems, hydraulic systems, high-pressure fittings
  • Advantages:
    • No need for thread sealant, PTFE tape, or gaskets
    • Provides a secure, leak-proof connection in fuel and hydraulic applications
    • Compatible with NPTF internal threads for a tight fit

NPSF threads are widely used in fuel and hydraulic applications where leak prevention is critical and a dry-seal system is preferred over traditional sealing compounds.

NPSF
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