Nylon tubing is semi-rigid, more abrasion-resistant, and better suited to fixed runs that may be stepped on or rubbed against surfaces. Polyurethane tubing is softer, more flexible, and better for short runs that flex repeatedly, such as connections to moving machine parts. Both materials are compatible with standard push-in fittings in matching OD sizes.

Most workshop and industrial compressors operate at 6 to 10 bar. Pneumatic tubing in this range is typically rated to 20 bar at ambient temperature, which gives a comfortable safety margin for standard compressed air applications. Pressure rating decreases at higher temperatures, so check the manufacturer's data if the tubing will run near heat sources.

The most common sizes for general workshop and industrial use are 6mm and 8mm OD. Larger diameters, 10mm, 12mm, and 16mm, are used for high-flow applications or long circuit runs where pressure drop is a concern. The fitting collet size must match the tube OD exactly: 6mm fittings for 6mm tube, 8mm fittings for 8mm tube.

Nylon tubing handles outdoor use in most climates, though prolonged direct sunlight will degrade it over time. For permanently outdoor-routed runs, use UV-stabilised grades or protect the tubing with conduit. Polyurethane degrades more quickly under UV. Check the operating temperature range if the installation will be exposed to freezing conditions.

OD stands for outer diameter, the dimension the push-in fitting grips. A 6mm tube has a 6mm outer diameter. The inner diameter, which determines flow capacity, varies with wall thickness. When ordering tubing to match existing fittings, always measure or confirm the OD, not the inner bore.

Use a purpose-made tube cutter or sharp rotary pipe cutter. The cut must be square and free of burrs for the collet in a push-in fitting to grip correctly and seal. A knife or hacksaw typically leaves a ragged edge that compresses unevenly against the O-ring and causes air to leak. If in doubt, cut back a few more millimetres and try again.

The Hosemaster delivers pneumatic tubing to all UK mainland addresses. Orders over £200 to England and Wales qualify for free delivery, with 1-2 day delivery available and same-day dispatch on most in-stock lines. For help selecting the right material and size, call 01282 604002.