Tab lock washer is a mechanical locking washer with protruding tabs. After tightening the nut, bend the tabs to lock against nut sides or component surfaces, preventing nut rotation and loosening under vibration and shock. Available in single‑tab, double‑tab and multi‑tab types. Material: carbon steel, stainless steel 304 / 316. Finishes: blue‑white zinc plated, color zinc plated, natural passivation. Widely used in machinery, bearing assemblies, automotive and heavy‑duty equipment.