Nord-Lock M12 X Series OD Washer Delta Protekt 100pk

Nord-Lock is the global leader in wedge-locking technology, engineering the world's most reliable locking washers for critical bolted joints. Nord-Lock washers prevent bolt loosening through vibration, dynamic loads, and cyclic stress — not by friction, but through a patented mechanical interlock that actually tightens under load. Used in civil infrastructure, heavy industry, mining, and defence worldwide.

Nord-Lock locking washers are available in Standard, Large O.D., X-Series, and SC Steel Construction variants across Metric and UNC thread sizes, with surface finishes including Delta Protekt coating and 316L or SMO 254 stainless steel for corrosion-critical environments.

Where this product is used

Nord-Lock locking washers are used in any bolted joint where vibration, dynamic loading, or critical safety requirements demand a positive, non-loosening connection.

• Heavy mining and civil equipment where vibration and dynamic loads are constant and bolt loosening is a safety risk
• Structural steel, bridge, and infrastructure connections requiring certified, verified bolt security
• Wind turbines, rail equipment, and marine applications in corrosive or extreme environments

Key specifications

Selecting the right option

Match the bolt size (M6–M48 metric, or UNC equivalent) and select the washer series — Standard for typical applications, Large O.D. where load distribution on soft materials is needed, X-Series for ultra-high-strength bolting, and SC for structural steel connections. Choose Delta Protekt for general corrosion protection, 316L stainless for marine and chemical environments, or SMO 254 for severe corrosion exposure. Kits provide an assortment of common sizes.