Pneumatic tubing
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Frequently asked questions
When should I use PU tube versus PA (nylon) tube?
PU is flexible with a small bend radius, suited to routing inside machines and moving mechanisms. PA is stiffer and handles higher pressure and temperature, suited to straight supply runs. Allowable pressure for both drops at higher temperature, so check the maker's derating table.
What does 8x5 or 8x6 on tubing mean?
The first number is the outside diameter and the second the inside diameter, in mm. Fittings follow the OD, while the ID affects flow and pressure rating. 8x5 has a thicker wall than 8x6, so it holds more pressure but passes less air.
What tubing should be used near welding cells?
Use spatter-resistant tubing, typically double-layer tube with a flame-retardant outer jacket or fluororesin tube. Standard PU is burned through quickly by weld spatter. Route lines away from direct spatter fall where possible.
How do I measure existing tubing to order a replacement?
Measure the OD with calipers and establish whether it is metric or inch. Identify the material from the print on the tube or its hardness when squeezed, and measure the total length needed. Colour usually only marks circuits and does not set the specification.
What pressure can pneumatic tubing withstand?
Tubing working pressure falls as temperature rises, so always check the maker's pressure versus temperature table. PA tubing usually handles higher pressure than PU of the same size. Bending tighter than the minimum radius also reduces pressure capacity and risks kinking.
How do I size tubing for flow?
The longer and smaller the tube, the greater the pressure drop, which makes cylinders slow and weak. As a general rule, the tube should not be smaller than the port of the valve feeding it. For runs longer than a few metres to a large cylinder, go up one tube size.
How should pneumatic tubing be cut?
Use a dedicated tube cutter to get a square cut without crushing, and avoid side cutters which deform the end. An angled or oval tube end will not seal against the O-ring inside a push-in fitting. Push the tube fully to the bottom of the fitting and then tug it gently to check.
How should pneumatic tubing be routed and secured?
Route tubing in trays or neat bundles, leaving some slack at moving sections so the tube is never pulled taut. Keep it away from heat sources and sharp edges, and do not over-tighten cable ties enough to flatten the tube. Using different tube colours for each circuit speeds up maintenance.
