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Thumbnail Filmstrip of 5406-08-06 | 1/2" NPTF Male x 3/8" NPTF Female Images
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Questions & Answers
Popular Questions
Yes, there is a difference between NPT (National Pipe Taper) and NPTF (National Pipe Taper Fuel). NPT threads are designed primarily for sealing with the use of a sealing compound, while NPTF threads have a more precise thread form and are designed to create a dry seal without the need for a sealant, making them suitable for fuel and high-pressure applications.
Yes, NPT (National Pipe Taper) threads can be used for hydraulic fittings, but they are not typically recommended for high-pressure hydraulic systems due to their tapered design, which can be prone to leaks. For better sealing and reliability in hydraulic applications, it is generally preferable to use fittings with O-ring seals or other dedicated hydraulic fitting standards like JIC or SAE.
NPT (National Pipe Taper) and NPTF (National Pipe Taper Fuel) threads are similar but not identical; NPTF threads have a more precise design for a leak-free seal without additional sealants. While they can sometimes be used together in non-critical applications, it is not recommended for high-pressure or safety-critical systems due to potential leakage issues.
The National Pipe Taper Fuel (NPTF) thread specification is a dry-seal pipe thread designed to provide a leak-proof seal without the need for sealants, as opposed to the standard NPT (National Pipe Taper) threads. The NPTF thread has slightly different tolerances, with a more controlled thread crest and root, allowing for a metal-to-metal seal when properly tightened. This makes NPTF suitable for applications where the avoidance of leakage is critical, such as in fuel and hydraulic systems.
NPT (National Pipe Taper) and NPTF (National Pipe Taper Fuel) are both types of thread standards used in hydraulic systems. The primary difference is that NPT threads require a sealant to ensure a leak-proof connection, while NPTF threads are designed to create a dry seal without the need for additional sealants, as they have tighter tolerances and are engineered to compress and seal on their own. This makes NPTF more suitable for applications where leakage prevention is critical.
A 3/8 NPT thread refers to a National Pipe Taper (NPT) thread size, commonly used for pipes and fittings in North America. The "3/8" denotes the nominal pipe size, which corresponds to an outer diameter of approximately 0.675 inches, although the thread dimensions and pitch are standardized to ensure a tapered, sealing fit for fluid or gas connections. NPT threads are designed to provide a tight seal, typically requiring the use of thread sealant or tape.
To determine NPT (National Pipe Taper) size, measure the outside diameter of the male threads or the inside diameter of the female threads, and then use a pipe sizing chart to match the measurement to the corresponding NPT size. Keep in mind that NPT sizes do not directly correspond to the actual diameter in inches; for example, a 1/2-inch NPT pipe has an outside diameter of approximately 0.84 inches.
