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Find the recommended tap size and drilled pilot hole for taper pipe threads according to ANSI standard. Compare NPT and NPS pipe sizes and learn how to seal and lubricate them.
- Machinist Screw Thread Tap
Pipe Thread Tap and Drill Size Chart ANSI NPT ; Internal...
- Taper Pipe Thread Data
National Standard Taper Pipe Threads Size NPT Chart -...
- Machinist Screw Thread Tap
Tap Chart - Pipe Threads: Tap size: Threads per inch: Drill size w/ taper pipe reamer: Drill size w/out taper pipe reamer: Straight pipe threads: 1/16: 27: 15/64: D ...
Tap SizeThreads Per InchDrill Size W/ Taper Pipe ReamerDrill Size W/out Taper Pipe Reamer1/162715/64D1/82721/64Q1/41827/647/163/8189/1637/64National Standard Taper Pipe Threads Size NPT Chart - Includes both External and internal Pipe Thread Data. The taper rate for all NPT threads is 1⁄16 (3⁄4 inch per foot) measured by the change of diameter (of the pipe thread) over distance.
Outside Diameter DNominal Pipe SizeThreads Per Inch (pitch)Thread Pitch Length, P24.0002480.1250020.0002080.1250018.0001880.1250016.0001680.12500- Designations of National Pipe Threads
- NPT Series – Tapered Pipe Thread
- NPSC – Internal Straight Pipe Thread
- NPTR – Railing Joint Taper Pipe Thread
- NPSM – Free-Fitting Mechanical Joints Thread
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Diameter: 1. The diameters are given in inch fractions. For example, 1/4″, 3/4″, 1 1/4″. 2. It is also allowed to denote the diameters with a decimal value. For example, 0.250 (1/4″), 0.4375 (7/16″), etc. Pitch: 1. By default, the pitch is given in TPI. For example, 1/4-20 means a thread with a pitch of 20 TPI (1/20=0.05″). 2. It is also allowed to...
NPT stands for National Pipe Tapered threads. The basic profile is a 60° truncated triangle similar to the Unified Inch threads (UNC/UNF). The main difference is that the thread profile is tapered at an angle of 1°47′ (0.75 in/ft or 62.5 mm/m) relative to the axis. The taper on NPT threads allows them to form a seal when torqued as the flanks of th...
NPSC Internal Straight (parallel) Pipe Threads are used to manufacture pressure-tight fittings when assembled with an NPT external taper thread. This series applies to internal threads only. (The external thread is the standard NPT thread).
The NTPR thread is used to connect Railing Joints that require a rigid mechanical connection, such as stair railings.
The NPSM thread series creates a non-pressure tight connection. It is mainly used in mechanical joints and special applications with no internal pressure and, consequently, no sealing requirements. It is possible to achieve a seal with the aid of an O-ring. 1. The profile form is similar to that of UN threads. 2. The allowance and tolerances are id...
Learn about the dimensions, formulas, and tolerances of NPT threads, a standard American pipe thread series. See charts, drawings, and examples of NPT, NPSC, NPTR, NPSM, and NPSL threads.
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The NPT - National Pipe Taper Threads - is based on the Briggs Standard Pipe Thread. Drill sizes for Briggs Standard Pipe taps for direct tapping without reaming are indicated below:
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4-1/4 Drill Bit. Only Sold Individually. Our most popular NPT Tap Sets: 5 Piece Carbon Steel NPT Pipe Tap Set, 1/8", 1/4", 3/8", 1/2" and 3/4" in Plastic Pouch Case. 6 Piece Carbon Steel NPT Pipe Tap Set, 1/8", 1/4", 3/8", 1/2", 3/4" and 1" in Wooden Case.