Internal & External Lock Washers Assorted 550 pce Kit

M3 External Qty 60 M4 External Qty 60 M5 External Qty 45 M6 External Qty 65 M8 External Qty 30 M10 External Qty 15 M3 Internal Qty 65 M4 Internal Qty 60 M5 Internal Qty 60 M6 Internal Qty 45 M8 Internal Qty 30 M10 Internal Qty 15 Lock washers secure bolts and lock nuts to prevent loosening during mechanical fastening and maintenance repairs. Commonly used on machinery, automotive parts, electrical equipment and household appliances — also known as locking washers, internal lock washers and external lock washers.