Due to the smooth cutting and lower cutting forces, machining times can be comparable to those of thread tapping and forming. This newest addition to the Walter thread milling system combines the advantages of thread milling with the efficiency of tapping. Walter has introduced the T2713, a universal indexable thread mill suitable for a variety of materials up to 55 HRC. Nominal Male Thread Outside Diameter (OD) (in)īrowse our extensive selection of National Pipe Tapered Thread (NPT) fittings.Walter T2713 indexable thread mill with Walter Capto C8 interface for large threads and/or long overhangs Taper angle is 0.75” per foot or 1° 47’.Pitch and diameter are measured in inches.Tapered thread profile seals by metal to metal interference fit, usually requires sealing compound for pressure tight connections.

NPTF physically interchangeable with NPT but has modified threads for better pressure tight sealing.

This connection is often used on fluid power systems, although it is not recommended by the National Fluid Power Association for use in hydraulic applications. Additional sealing aids such as Teflon® tape are used with these threads. This thread type is the most commonly used tapered pipe thread connection found on equipment made in North America. NPTF threads are the same basic shape as NPT but with crest and root heights adjusted for an interference fit, eliminating the spiral leakage path. NPT is defined by ANSI/ASME standard B1.20.1.Ī semi-compatible variant called 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. In America, William Sellers set the standard for nuts, bolts, and screws which became the National Pipe Tapered Thread (NPT) in 1864.

In contrast to straight threads that are found on a bolt, a taper thread will pull tight and therefore make a fluid-tight seal.

standard for tapered threads used on threaded pipes and fittings.

Thread milling npt mastercam