Lock Washer

The Zinc Plated Internal & External Serrated Lock Washer is a durable and reliable multi-purpose fastening accessory designed for anti-loosening fixation and conductive grounding connection in electrical, electronic, automotive and general industrial assembly scenarios. Constructed with a spring steel body equipped with sharp serrated teeth on both inner and outer circumferences, this serrated washer generates powerful friction bite force after tightening, which effectively prevents nuts and bolts from loosening under long-term vibration, while breaking surface oxidation film to form stable conductive grounding contact.

Manufactured from premium 65Mn spring steel and high carbon spring steel, this double-tooth lock washer features excellent elastic toughness, fatigue resistance and long service life. The surface is processed with blue-white electro zinc plating to form a compact anti-rust protective layer, which resists oxidation and mild moisture erosion, maintaining stable performance and bright appearance under indoor and light-duty working environments. The anti-corrosion coating significantly extends the service cycle of the washer.

The unique double-sided serrated structure provides dual anti-loosening protection. The inner serrated teeth clamp tightly on the bolt shank, and the outer sharp serrated teeth bite firmly into the metal mounting surface. The combined friction locking force eliminates rotation slip caused by mechanical vibration, greatly reducing the risk of fastener loosening and falling off. Meanwhile, the sharp serrations penetrate paint and oxide layers to build reliable conductive paths, making it an ideal component for equipment earthing and static discharge. Standard central holes match all metric standard bolts to adapt to automated assembly production lines.

Internal and external serrated lock washers are widely applied to electrical control cabinet assembly, electronic shell grounding, automotive wire terminal fixing, solar panel earthing systems, home appliance internal fastening, and all mechanical linkage systems requiring both anti-loosening and conductive grounding functions. Its integrated locking and grounding performance makes it an essential auxiliary fastener for electronic and electrical manufacturing industries.

We provide complete OEM and ODM manufacturing services and support custom production according to customer drawings, samples and special technical specifications. Custom inner hole sizes, outer diameters, plate thickness, tooth density and personalized export packaging are available to meet unique project requirements. Custom private labeling and brand printing services are also supported for hardware distributors, electronics factories, auto component manufacturers and solar engineering suppliers.

Every zinc plated internal & external serrated lock washer is produced under strict fastener quality control standards. All finished products undergo comprehensive dimensional inspection, elastic fatigue testing and surface coating uniformity inspection before shipment, to guarantee precise dimensional tolerance, stable elastic performance and qualified anti-corrosion zinc coating for every production batch.