Locking plate

Lock washer according to DIN 5406 for securing lock nuts according to DIN 981

A locking plate is a washer made of soft sheet steel for the positive locking of nuts , in particular locknuts , from twisting . A locking plate has a tongue on the inside diameter, which engages in a groove in a stationary machine part or an axle or shaft . On the outer diameter there are one or more tongues that can be knocked into a groove of a locknut or around the hexagon of a nut in order to prevent the nut from turning or loosening unintentionally.

Lock washers for locknuts according to DIN 981 are described by the DIN 5406 standard . The standard distinguishes between different designs that are suitable for the corresponding designs of the locknut. The MB design is used as standard; the MBL variant has a thinner edge and is used for KML type locknuts .

For locknuts of type HM that a trapezoidal thread have, instead of a safety plate is a securing clip used by the hexagon head screw is fixed. Safety brackets are also described in the DIN 5406 standard and designated with MS .