Stainless Steel SS201 / SS304 / SS316 / SS316L Serrated Lock Washer – Features a ring-shaped serrated structure with alternating internal and external teeth that interlock tightly with the surface of connected components, increasing friction and creating a mechanical locking effect to effectively resist loosening caused by vibration and impact. Made of high-quality stainless steel with excellent rust and corrosion resistance, outstanding toughness, and a stable structure that resists deformation. Suitable for humid, chemical, outdoor, and other corrosive environments. Widely used in precision equipment, marine applications, and outdoor engineering fastening assemblies.