Compact (miniature) one touch fittings of round male straight with internal hex is used to connect a air hose tube on one ends to a female threaded connection in straight line. Internal hex allows thread connection by using an Allen wrench. Mini push in fitting round male straight with internal hex is compact designed, ideal for confined space. You can install them where normal pneumatic fittings are not are not sufficiently compact. Compact pneumatic fitting round male straight with internal hex is made of nickel plated brass, stainless steel retaining claws which securely retain the tubing and NBR sealing ring between the tubing and body of the fitting which forms a perfect seal. Miniature push to connect fittings are available for tube diameters from 3 mm, 4 mm and 6 mm, and and M3, M5, M6, R 1/8, 10-32 UNF, and NPT 1/8 thread sizes. Working pressure from 0~1.0 Mpa (0~150 psi). Working temperature from 0~60ºC (32~140ºF). Miniature push in fittings are suitable for miniature cylinder, miniature gripper, miniature solenoid valve and 3D printer.