NPSM, or National Pipe Straight Mechanical threads, are also often found in fluid power systems. The female component incorporates a straight, non-tapered thread with an inverted 30° chamfer of the male connector on the seat of the female. This is a mechanical seal. If and NPTF male is properly chamfered it will also seat with NPSM female connection. They are especially suited for manufacturers and end users that rely on versatility.

NPTFtap

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NPTF threaddimensions pdf

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Are NPT andNPTFcompatible

There are two standard types of aluminum angle most commonly produced today, Architectural and Structural.

NPT style threads are very similar to BSP, certain DIN styles, and other non-US thread styles. Although visually very similar, the differences in thread dimensions, pitch and angle make them incompatible, so care needs to be taken to properly identify your connection to create a safe and leak resistant seal.

NPTFvs NPT

Sealing performance decreases rapidly with re-assembly and larger sizes are more prone to leaking because of the leak path size

NPTFfittings

Where traditional NPT threads have a small clearance between the crest and root of the mating threads requiring the use of sealant, the NPTF thread root does not allow this clearance. It contacts and deforms the mating thread crest. NPTF, or National Pipe Taper Fuel, style connections are widely used in fluid power systems. This type of connector is designed to provide a dry thread seal. However, lubricant is often still used to ease assembly.

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NPT vsNPTF threaddimensions

NPT connections rely on thread deformation- a metal to metal sealing design where the threads of the connectors themselves form together. This design is ideal fore single assembly applications and not recommended where connections will be assembled and disassembled frequently due to wear on the threads from deformation.

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NPT connections seal pipes for fluid and gas transfer. They’re available in iron and brass for low-pressure applications and carbon and stainless steel for higher pressure. The nominal pipe size can be identified by physically measuring the thread diameter, then subtracting 1/4″. NPT (or National Pipe Taper) is a U.S. standard for tapered threads widely used on pipes and fittings for over 100 years.

NPTF threadChart

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