m200 slotDIN 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.Samsung M200 phone. Announced Sep 2008. Features 1.9″ display, 1.3 MP primary camera, 4 MB storage.