Engineering ToolBox - Resources, Tools and Basic Information for Engineering and Design of Technical Applications!

ANSI B1.20.1 - NPS - American National Standard Straight Pipe Threads

NPS pressure tight straight pipe threads with lubricant or sealer.

Dimensions of NPS - American National Standard Straight Pipe Thread - not self-sealing threads are indicated below:

ANSI B1.20.1 - NPS - American National Standard Straight Pipe Threads
Pipe Size
(inches)
TPIPipe Diameter
(inches)
Female Thread Inside Diameter
(inches)
Tap Drill
1/8 27 0.405 0.34 S
1/4 18 0.540 0.47 29/64
3/8 18 0.675 0.59 19/32
1/2 14 0.840 0.75 47/64
3/4 14 1.050 0.97 15/16
1 11.5 1.315 1.20 1 3/16
1 1/4 11.5 1.660 1-55 1 33/64
1 1/2 11.5 1.900 1.79 1 3/4
2 11.5 2.375 2.26 2 7/32
2 1/2 8 2.875 2.71 2 21/32
3 8 3.500 3.33 3 9/32
3 1/2 8 4.000 3 25/32
4 8 4.500 4 9/32
4 1/2 8 5.000 4 25/32
5 8 5.563 5 11/32
6 8 6.625 6 13/32
  • 1 inch = 25.4 mm
  • TPI - Threads per Inch
  • B1.20.1 Standard on Pipe Threads, General Purpose, Inch

Note that both NPT and NPS have the same thread angle, shape, and pitch (threads per inch). However, NPT threads are tapered and NPS threads are straight (parallel). Both threads have a 60° included angle and flat peaks and valleys.

Related Topics

Related Documents

Search

Search is the most efficient way to navigate the Engineering ToolBox.

Engineering ToolBox - SketchUp Extension - Online 3D modeling!

3D Engineering ToolBox Extension to SketchUp - add parametric components to your SketchUp model

Add standard and customized parametric components - like flange beams, lumbers, piping, stairs and more - to your Sketchup model with the Engineering ToolBox - SketchUp Extension - enabled for use with older versions of the amazing SketchUp Make and the newer "up to date" SketchUp Pro . Add the Engineering ToolBox extension to your SketchUp Make/Pro from the Extension Warehouse !

Translate this Page

Translate this page to Your Own Language .

About the Engineering ToolBox!

Privacy Policy

We don't collect information from our users. More about

We use a third-party to provide monetization technologies for our site. You can review their privacy and cookie policy here.

You can change your privacy settings by clicking the following button: .

Citation

This page can be cited as

  • The Engineering ToolBox (2009). ANSI B1.20.1 - NPS - American National Standard Straight Pipe Threads. [online] Available at: https://www.engineeringtoolbox.com/american-standard-straight-pipe-threads-d_1520.html [Accessed Day Month Year].

Modify the access date according your visit.

3D Engineering ToolBox - draw and model technical applications! 2D Engineering ToolBox - create and share online diagram drawing templates! Engineering ToolBox Apps - mobile online and offline engineering applications!

Unit Converter

















































3.27.8

.