We measure Pu Air Hose by their internal diameter (or I.D). Simply speaking, the larger the hose I.D, the more air it’ll be able to carry. While the external diameter of air hoses will vary wildly depending on the quality of the hose and the material it’s made from, common internal sizes of air hose are 6mm, 8mm and 10mm internal diameter.

The rule of thumb when picking your hose I.D is the higher the CFM requirement of your air tool, the larger the diameter hose you’ll need. Hand held tools such as spray guns and nailers tend to require 1-3 CFM and will work perfectly well with a 6mm hose. A heavy duty impact wrench is more likely to require 6 CFM+, so you’ll probably require an 8mm or 10mm hose to run at full capacity.

The diameter of a hose will affect the overall weight of the line quite dramatically. Adding a couple of extra millimetres to the hose I.D. soon adds up over a distance. For small handheld tools, where dexterity counts, choose a 6mm hose.

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