Search
导航菜单
文章正文
National Standard Taper Pipe Threads Size NPT Chart
Published:2018-09-01 08:35:19    Text Size:【BIG】【MEDIUM】【SMALL
Summary:National Standard Taper Pipe Threads Size NPT Chart - Includes both External and internal Pipe Thread Data.

National 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. The angle between the taper and the center axis of the pipe is 1° 47'′ 24"″ (1.7899°). Commonly-used sizes are 1/⁄8, 1/⁄4, 3/⁄8, 1⁄/2, 3⁄/4, 1, 1 1⁄/4, 1 1⁄/2, and 2 inch, appearing on pipes and fittings by most U.S. suppliers. Sizes smaller than 1/⁄8 inch are occasionally used for compressed air, while sizes larger than 2 inches are uncommon, due to the use of alternative methods of joining that are used with these larger sizes. NPT is defined by ANSI/ASME standard B1.20.1.

Nominal Pipe Size is loosely related to the inside diameter of Schedule 40 pipe. Because of the pipe wall thickness, the actual diameter of the threads is larger than the NPS, considerably so for small NPS. Other schedules of pipe have different wall thickness but the OD (outer diameter) and thread profile remain the same, so the inside diameter of the pipe is therefore different from the nominal diameter.

Notes:

 

  • Reference ANSI/ASME B1.20.1-1983 (R1992)
  • Angle between sides of thread is 60 degrees.
  • Thread taper, is 3⁄4 inch per foot.
  • All units are in inches.
Outside DiameterNominal Pipe SizeThread per Inch (Pitch)Thread Pitch Length, PPitch Diameter at External Thread Start E0Hand Tight Thread Engagement Length, L1Diameter E1Maximum Thread Engagement L2Diameter E2
0.31251/16270.037040.271180.1600.281180.26110.28750
0.4051/8270.037040.363510.16150.373600.26390.38000
0.540¼180.055560.477390.22780.491630.40180.50250
0.6753/5180.055560.612010.2400.627010.40780.63750
0.840½140.071430.758430.3200.778430.53370.79179
1.050¾140.071430.967680.3390.988870.54571.00179
1.315111 ½0.086961.213630.4001.238630.68281.25630
1.6601 ¼11 ½0.086961.557130.4201.583380.70681.60130
1.9001 ½11 ½0.086961.796090.4201.822340.72351.84130
2.3752011 ½0.086962.269020.4362.296270.75652.31630
2.8752 ½80.086962.719530.6822.762161.13752.79062
3.5003/580.125003.340620.7663.388501.20003.41562
4.0003 ½80.125003.837500.8213.88811.25003.91562
4.500480.125004.334380.8444.387121.30004.41562
5.563580.125005.390730.9375.449291.40635.47862
6.625680.125006.446090.9586.505971.51256.54062
8.625880.125008.433591.0638.500031.71258.54062
10.7501080.1250010.545311.21010.620941.925010.66562
12.7501280.1250012.532811.36012.617812.125012.66562
14.0001480.1250013.775001.56213.872622.250013.91562
16.0001680.1250015.762501.81215.875752.450015.91562
18.0001880.1250017.750002.00017.875002.650017.91562
20.0002080.1250019.737502.12519.870312.850019.91562
24.0002480.1250023.712502.37523.860943.250032.91562

National Standard Taper Pipe Threads Size NPT Chart

Products Category
Products Search
脚注信息

China Highest Quality Measure Tool Supplier,Copyright (c) 2009-2012  Sowant Precision Gage Co.,Ltd, All Rights Reserved.sitemap

API Thread Gage, Cylindrical Gage, Air Ring Gage, Spline gage, Ceramic Block Gage,BCSG Thread Gage,China Made API Gage

QQ客服
点击这里给我发消息