![]() ![]() This means that NPT fittings should be burr-free and lubricated using a lubricating material like lubricating paste or tape. As 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 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 the seal. These threads are now used in materials other than steel and brass, including PTFE, nylon, bronze, and cast iron. Threaded pipes can provide an effective seal for pipes transporting liquids, gases, steam, and hydraulic fluid. 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. National Pipe Thread Taper ( NPT ) is a U.S. The following is a ANSI Standard Pipe Thread Recommended Tap size and Drilled Pilot Hole for Taper Machinist Metric ISO Screw Thread Tap - Drill Size Chart Machinist Tap - Drill Chart for ANSI Size Threads Pipe Thread Tap and Drill Size Chart ANSI ![]()
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