Metal One-touch Fittings Series KQB2 Applicable tubing O.D. (mm) Connection thread Applicable tubing O.D. (inch) o1/8'' o5/32'' o1/4'' o5/16'' o3/8'' o1/2'' M5 R1/8 G1/8 R1/4 G1/4 R3/8 Connection thread 10-32 UNF NPT1/8 NPT1/4 NPT3/8 NPT1/2 No thread G3/8 R1/2 o16 G1/2 No thread Variations Material Metal parts: Brass, Stainless steel Seal parts: Special FKM All metal except seal parts .5 to 150°C 17 models M, R, Rc, UNF, NPT, G Compact and lightweight Fluid temperature Configuration variations Connection thread RoHS o4 o6 o8 o10 o12 113