NPT threadfull form

Both NPT and NPTF have the same threads-per-inch, pitch diameters, and taper-per-inch. The differences come in the major and minor diameters, the root and crest of the threads.

NPT threadvs BSP

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The NPTF thread roots are different than the NPT thread roots. NPTF thread roots are designed to interfere with the crest of the mating thread with the intention of creating a mechanical seal through thread form deformation at assembly. NPTF threads have the same basic shape but with crest and root heights adjusted for an interference fit, eliminating the spiral leakage path. NPTF threads have two classes identified: Class 1 and Class 2. NPT thread roots are designed to allow clearance with the mating thread crests on assembly.

The requirements for NPT (National Pipe Thread) are spelled out in ANSI B1.20.1The requirements for NPTF (National Pipe Thread Fuel) are spelled out in ANSI B1.20.3

Npt threadtypes

Npt threadsizes

While NPT, NPTF & NPS threads will engage and seem like they fit - they will not seal properly with each other causing leaks.

Both NPT and NPS have the same thread angle, shape, and pitch (threads per inch). However, NPT threads are tapered and NPS threads are straight (parallel). Both threads have a 60° included angle and have flat peaks and valleys. Tapered Pipe Thread is commonly found on ends of pipe, nipples and fittings (ex: couplings, elbows, tees, etc.).

1/2npt threaddimensions in mm

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Dovetail Workwear’s ReTooled Fit Project is taking new measures. Thanks to customer feedback, we are fine-tuning our fit for sizes 16 and above. After meticulous reframing and wear testing, we're excited to launch this innovative fit in our new Old School High Rise pants. Loyal customers size 16 and above may now need a smaller size.This measurement chart is meant to be one of many tools in your toolbox in finding the right fit. Use this as one of many factors in deciding size. Your measurements may show that you could fit into more than one size. Please choose based on your preferred level of compression. Each product has a stretch level indicator. For high stretch fabrics, consider sizing down.

NPT threaddimensions PDF

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Lastly, while this chart may work for most, we know it won't work for all. If you have a beautiful unique body shape and need some additional guidance, please reach out to CS@dovetailworkwear.com for a fit consultation.

National Pipe Taper Fuel (NPTF), also called Dryseal American National Standard Taper Pipe Thread, defined by ASME B1.20.3, is designed to provide a more leak-free seal without the use of PTFE tape (aka "Teflon") or other sealant compound.

Sharply angled threads are very critical to joint being tight with no leaks. Thread sealant or tape is typically required to complete the seal. Straight Pipe Threads need a gasket or O-ring to create a seal. While NPT and NPS threads will engage, they do not seal properly with each other.

NPT threadangle

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Npt threadchart

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