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

ISO 228 - Pipe Threads where Pressure Tight Joints are not made on the Threads

Requirements for thread form, dimensions, tolerances and designation for fastening pipe threads, thread sizes.

The ISO 228 "Pipe Threads where Pressure-tight Joints are not made on the Threads" consists of the following parts:

  • ISO 228-1:2000 Dimensions, tolerances and designation
  • ISO 228-2:1987 Verification by means of limit gauges
ISO 228 - Pipe Threads where Pressure Tight Joints are not made on the Threads
G Size
(in)
Major (Outside) Diameter (mm)
Minor (Nut) Diameter
(mm)
Core Hole Diameter
(mm)
Thread Count
(TPI)
Thread Pitch
(mm)
G 1/8 9.73 8.85 8.80 28 0.907
G 1/4 13.16 11.89 11.80 19 1.337
G 3/8 16.66 15.39 15.25 19 1.337
G 1/2 20.95 19.17 19.00 14 1.814
G 5/8 22.91 21.13 21.00 14 1.814
G 3/4 26.44 24.66 24.50 14 1.814
G 7/8 30.20 28.42 28.25 14 1.814
G 1 33.25 30.93 30.75 11 2.309
G 1 1/8 37.90 35.58 35.30 11 2.309
G 1 1/4 41.91 39.59 39.25 11 2.309
G 1 3/8 44.32 42.00 41.70 11 2.309
G 1 1/2 47.80 45.48 45.25 11 2.309
G 1 3/4 53.74 51.43 51.10 11 2.309
G 2 59.61 57.29 57.00 11 2.309
G 2 1/4 65.71 63.39 63.10 11 2.309
G 2 1/2 75.18 72.86 72.60 11 2.309
G 2 3/4 81.53 79.21 78.90 11 2.309
G 3 87.88 85.56 85.30 11 2.309
G 3 1/4 93.98 91.66 91.50 11 2.309
G 3 1/2 100.33 98.01 97.70 11 2.309
G 3 3/4 106.68 104.30 104.00 11 2.309
G 4 113.03 110.71 110.40 11 2.309

Example - Typical designation for Thread according ISO 228

  • ISO 228 G 3 1/4"

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 (2018). ISO 228 - Pipe Threads where Pressure Tight Joints are not made on the Threads. [online] Available at: https://www.engineeringtoolbox.com/iso-228-pipe-threads-d_2037.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

















































11.4.12

.