Self-Locking Counter Nuts, Metric - Spring Steel - BZP (Bright Zinc Plated) - PAL - DIN 7967

PAL self-locking counter nuts have to be spun down the thread until finger-tight, then locked by a quarter to half turn with a spanner. Besides the clamping force, a simultaneous radial force will be developed causing a locking action. Often used as a locknut above a hexagon nut- disassembly by tightening the hexagon nut firmly.