1/4 iso 228

TPI is used for American fasteners. Thread pitch is the distance between the threads and is used for metric fasteners. Privacy We don't collect information from our users. Citation This page can be cited as Engineering ToolBox, Modify access date.

Scientific Online Calculator. Works great. Fast shipping. Jan As advertised! Sep Store price double of this. Highly recommended. Aug Good dealer. Couldn't find the grease fittings anywhere else. Jul Finally found them. Working great! Normally, the coarse thread series is used and may be called out by diameter alone, as MS. The fine thread series must have both diameter and pitch called out, as MS x 0. If pitch is not called out, the coarse thread is assumed.

Sometimes other sizes are available. Larger standard sizes run up to mm or more. Smaller sizes go down to 0. On many threads a good drill size for tapping can be figured by subtracting pitch from major outside diameter.

In this chart, fine threads from M1,6 to M7 are listed but are seldom used and may be difficult to obtain. They are shown in italic type. Note: These thread sizes are not used as port threads in components. Please refer to the chart above. Download Data Sheet. Inches Pipe O. Email Us. Tel: 1 Have a Question? Parallel Thread Only.

Suggested Tap Drill. Tapered or Parallel. Pipe O.