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Identify a thread

Not sure what thread you have?

Three measurements are usually enough. Use calipers or a ruler, and a thread gauge if you have one.

Rendering of a brass tee with male pipe threads and an O-ring injector branch
  1. 1
    Diameter

    Measure across the outside of a male thread, or the inside of a female port. Measure the peaks, not the valleys.

  2. 2
    Pitch

    Count thread peaks over one inch, or measure the distance between peaks in millimeters for metric.

  3. 3
    Taper

    If it narrows toward the end it is NPT or BSPT. Straight threads seal with an O-ring, washer or flare.

Thread data

Sizes, dimensions and pressure ratings for every standard we machine. Pressure values are nominal working ratings for steel at room temperature.

Ready to build it?

Once you know the thread, pick the other end and see the price.

Start building