Lock Washer

The Zinc Plated Internal & External Serrated Lock Washer is a durable and reliable dual-function fastening accessory designed for anti-loosening fixation and conductive earthing connection in electrical equipment, automotive electronics, solar grounding and vibration-sensitive industrial assembly applications. Featuring a spring steel washer body covered with sharp serrated teeth on both inner and outer circles, this double-tooth lock washer delivers powerful bite friction after tightening, effectively preventing bolt and nut loosening under continuous vibration while realizing stable conductive grounding contact between components.

Manufactured from premium high carbon spring steel or 65Mn spring steel, the serrated lock washer possesses excellent elastic recovery, fatigue resistance and long-term wear durability. The surface undergoes blue-white electro zinc plating treatment, forming a compact zinc protective film to resist oxidation and light moisture corrosion, maintaining bright uniform appearance and stable performance in indoor electrical and light industrial environments. These anti-rust coatings effectively extend the service life of the washer.

The integrated internal and external serrated tooth structure provides dual friction locking force. Inner teeth tightly grip the bolt shank, while outer sharp teeth bite firmly into the metal mounting surface. The combined bite effect greatly eliminates sliding rotation caused by vibration, avoiding fastener loosening and falling off. Meanwhile, the sharp serrations pierce surface oxide layers to create reliable conductive paths, making it ideal for equipment earthing and static elimination. Standard central holes perfectly match metric bolts for quick automatic assembly.

Internal and external serrated lock washers are widely used for electrical control cabinet assembly, electronic device shell grounding, automotive wiring terminal fixation, solar panel earthing connection, home appliance internal assembly, and all mechanical linkage systems that require both anti-loosening fastening and conductive grounding. Its dual anti-loosening and conductive functions make it an indispensable auxiliary fastener for electrical and electronic manufacturing projects.

We provide OEM and ODM manufacturing services and support customized production according to customer drawings, samples or special technical requirements. Custom inner hole sizes, outer diameters, washer thickness, tooth density and exclusive export packaging are available to satisfy unique project demands. Private labeling and custom branding printing services are also supported for hardware distributors, electronics manufacturers, auto parts factories and solar engineering suppliers.

Each zinc plated internal external serrated lock washer is manufactured under strict fastener quality control standards. All finished washers pass comprehensive dimensional inspection, elastic fatigue testing and surface coating uniformity check before shipment, ensuring accurate size, stable elastic performance and qualified anti-corrosion zinc layer for every batch of products.