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If you need air fittings for 6mm tubing, PMC Stone offers a wide variety of sizes and types!
NOTE: All thread sizes are BSPP (British Standarnd Parallel Pipe) or commonly known as G thread
See below for outside dimaeter thread size reference. (approximate values)
1/8" ≈ 0.383" (9.73mm) 1/4" ≈ 0.518" (13.16mm) 3/8" ≈ 0.656" (16.66mm) 1/2" ≈ 0.825" (20.96mm)