#4 inches actual size full#
#4 inches actual size iso#
#4 inches actual size series#

The use of tape also helps to limit corrosion on the threads, which otherwise can make future disassembly nearly impossible.Ĭommonly used sizes are 1⁄ 8, 1⁄ 4, 3⁄ 8, 1⁄ 2, 3⁄ 4, 1, 1 + 1⁄ 4, 1 + 1⁄ 2, 2, 2 + 1⁄ 2, 3, 4, 5, and 6 inch, as pipe and fittings by most US suppliers. This means that NPT fittings should be burr-free and lubricated using a lubricant like lubricating paste or thread seal tape. The sealants, where used, are typically thread seal tape thread sealant or a thread seal paste pipe dope (sometimes similar in composition to plumber's putty).īecause the thread body is tapered (0.75 in/ft or 62.5 mm/m), a larger diameter keeps compressing into a smaller diameter and finally forms a seal (no clearance remains between the crests and roots of the threads because of the taper). The various types of pipe threads are designed for use both with or without thread sealants, as particular applications demand. The taper on NPT threads allows them to form a seal when torqued as the flanks of the threads compress against each other, as opposed to parallel/straight thread fittings or compression fittings in which the threads merely hold the pieces together and do not provide a seal. These threads are now used in materials other than steel and brass, including PTFE, PVC, nylon, bronze, and cast iron. Threaded pipes can provide an effective seal for pipes transporting liquids, gases, steam, and hydraulic fluid. Named after SAE International similar to NPTF but one turn shorter Similar to NPSF but slightly larger internal only, straightĪmerican National Standard Straight Pipe Thread for Loose-fitting Mechanical Joints with LocknutsĪmerican National Standard Straight Pipe Thread for Free-fitting Mechanical Jointsĭryseal USA (American) Standard Taper Pipe Threadįor dryseal connections in nearly every type of service, especially fuel connectionsĪmerican National Standard Taper Pipe Thread for Railing Joints Tapered and needs thread sealant for connections in nearly every type of serviceĪmerican National Standard Straight Pipe Threadįor rigidity sealable with o-ring or gasket sometimes male straight is mated with female tapered for low-pressure sealing (need to verify)Īmerican National Standard Straight Pipe Thread for Couplingsĭryseal USA (American) Standard Fuel Internal Straight Pipe ThreadĪmerican National Standard Straight Pipe Thread for Hose Couplingsĭryseal USA (American) Standard Intermediate Internal Straight Pipe Thread

#4 inches actual size full#

The various types are each named with an abbreviation and a full name, as follows: Abbreviation Īmerican National Standard Taper Pipe Thread

#4 inches actual size iso#

Outside North America, some US pipe thread sizes are widely used, as well as many British Standard Pipe threads and ISO 7–1, 7–2, 228–1, and 228-2 threads. MIP is an abbreviation for male iron pipe, and FIP is an abbreviation for female iron pipe. The types are named with a full name and an abbreviation, such as NPT, NPS, NPTF, or NPSC.

#4 inches actual size series#

They include both tapered and straight thread series for various purposes, including rigidity, pressure-tight sealing, or both. The pipe has a male NPT thread, while the elbow is female.Īmerican National Standard Pipe Thread standards, often called national pipe thread standards for short, are United States national technical standards for screw threads used on threaded pipes and pipe fittings. national technical standards for threads on pipes and pipe fittings Threaded pipe and elbow.