Miniature LM Fittings are specifically designed fittings for miniature pneumatics applications. These fittings are suitably used with plastic (Polyethylene, Nylon and Polyurethane) and soft metal (copper and mild steel) tubes having an outside diameter of 4mm +0.05/ -0.07. M3 and M5 threaded ends are specially designed to be tightened manually by hands that give leakage proof solution.