m200 slotThe M200 offers exceptional security, stability, and reliability across a wide range of applications, including self-service shopping, laundry services, vending machines, gas stations, parking lots, ticketing systems, and more.DIN 981 Slotted Round Lock Nut. Slotted Round Lock Nuts, also named Round lock nut, Slotted Round nuts, Shaft lock nuts, made of steel, M10-M200 from China lock nuts manufacturer.