S-97985A810 13 mm ID x 20.5 mm OD DIN 6798 External-Tooth Lock Washers

Key Features & Benefits at a Glance

• Superior vibration resistance with external teeth that bite into mating surfaces to prevent fastener loosening under dynamic loads
• Maximum locking force achieved through precise tooth geometry that maintains constant spring tension against both fastener and workpiece
• Enhanced corrosion protection with zinc-plated steel construction that withstands harsh industrial environments
• Precise dimensional accuracy with 13mm ID and 20.5mm OD ensuring perfect fit for M12 fasteners in demanding applications
• Exceptional durability with Rockwell C35 hardness providing reliable performance through repeated assembly cycles
• Industry-standard compliance meeting DIN 6798 specifications for consistent quality and interchangeability
• Environmental responsibility with RoHS 3 and REACH compliance for sustainable manufacturing practices

Professional Applications & Engineering Value

This M12 external tooth lock washer delivers critical engineering value in applications where vibration-induced fastener failure poses significant operational risks. The zinc-plated steel construction combines corrosion resistance with the mechanical strength needed for heavy machinery, automotive assemblies, and industrial equipment. The external tooth configuration creates multiple biting points that dig into both the fastener head and base material, distributing locking force evenly around the circumference. This design effectively counters rotational forces that cause conventional fasteners to loosen over time. The DIN 6798 compliance ensures dimensional precision and performance reliability, making these washers ideal for maintenance-critical applications in manufacturing plants, transportation systems, and construction equipment where downtime from fastener failure is unacceptable.

Specification Summary & Compliance

Manufactured to DIN 6798 standards with precise dimensional tolerances including 13mm inner diameter, 20.5mm outer diameter, and 1.0-1.2mm thickness specifically engineered for M12 fasteners. The Rockwell C35 hardness ensures consistent performance under load. Full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, with external tooth location providing optimal locking action. This washer meets international quality standards for industrial fastener applications requiring reliable vibration resistance.