Standard requirements: dimensions meet DIN22258 Part 2, mechanical performance is much higher than DIN22258 Part 2 Safety number: 26*92 MCB140115 30*108 MCB140116 34*126 MCB140117 38*137 MCB140118 42*146 MCB140119 48*152 MCB140120 Usage: for horizontal installation, fully compatible with D-level chain. Designed specifically for the connection of a ring circuit with a compact circuit. Main characteristics: the use of high-quality alloy steel as raw material, the use of "controlled atmospheric multi-purpose furnace" for heat treatment, to ensure chain ring deformation in the heat treatment process and oxidative decarbonization phenomenon, with very high mechanical properties and fatigue service life.