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Pneumatic Information Home : Selecting Proper Thread & Tube Sizes
All of the cylinders, fittings, and parts we sell indicate the proper thread
and tube sizes to use.
Use the information contained here if you have parts obtained some place
else and you don't know what the proper thread and tube sizes should be.
THREAD SIZES
Have you ever tried to order a fitting that has pipe thread and had difficulty determining
the thread size you need? If so, you’re not alone. The reason may be that pipe thread size
does not refer to the inside or the outside diameters of the pipe fitting. It refers to an
industry designation (NPT - National Pipe Thread), not the actual size.
Listed below are some quick reference charts that we hope will help you to determine
which size pipe fitting you need.
VISUALLY DETERMINING THREAD SIZES
Use this chart when ordering fittings with threads to help insure a proper fit:
Finding the thread size with a tape measure
To determine the size of pipe fitting thread you need, first use a tape measure or scale to
measure the inside diameter (ID) of the threaded hole were you would like to install the
fitting or the outside diameter (OD) of your existing fitting as shown below.
After determining your measurement choose the closest ID or OD dimension listed in the
chart below and select your pipe thread size. (Dimensions shown are approximate values
and you may need to round up to the closest value).
| Threaded Fitting OD or Hole ID Measurement | 3/8” | 1/2" | 5/8" | 3/4" | 1" |
Pipe Fitting Thread Size
(Order this size) | 1/8” Pipe | 1/4” Pipe | 3/8” Pipe | 1/2” Pipe | 3/4” Pipe |
TUBE SIZES
Tube sizes correspond to actual measurements. Measure the OD (Outside Diameter) of the tube
to get the tube size.
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