S-91190A610 21.2 mm ID x 30.6 mm OD DIN 7980 Split Lock Washers for Socket Head Screws

Key Features & Benefits at a Glance

• Superior vibration resistance from the split lock design, preventing fastener loosening in high-stress environments
• Enhanced corrosion protection with black-oxide steel construction for extended service life in industrial conditions
• Exceptional mechanical strength with Rockwell C44 hardness to withstand heavy loads without deformation
• Precise dimensional compatibility with 21.2mm ID and 30.6mm OD ensuring perfect fit for M20 screw applications
• Reliable performance standardization through DIN 7980 certification for consistent quality and interchangeability
• Optimal spring tension from 4.3-4.7mm thickness range providing consistent locking force across temperature variations
• Global regulatory compliance meeting RoHS 3 and REACH requirements for international supply chain integration

Professional Applications & Engineering Value

This M20 metric split lock washer delivers critical vibration-damping performance for demanding industrial applications where fastener security is paramount. The black-oxide steel construction provides essential corrosion resistance while maintaining the Rockwell C44 hardness needed for heavy machinery, automotive assemblies, and construction equipment. Engineered to DIN 7980 specifications, this standard split lock washer solves common loosening issues in high-vibration environments through its helical cut design that creates continuous spring tension against both bearing surface and fastener. The precise 21.2mm internal diameter ensures perfect seating on M20 screws while the 30.6mm outer diameter provides optimal load distribution, making it ideal for critical bolted connections in manufacturing, transportation, and heavy equipment sectors where reliability cannot be compromised.

Specification Summary & Compliance

This split lock washer features dimensional accuracy with 21.2mm internal diameter, 30.6mm outer diameter, and 4.3-4.7mm thickness range. Manufactured from black-oxide steel with Rockwell C44 hardness rating, it complies with DIN 7980 standard for metric lock washers. The product meets RoHS 3 (2015/863/EU) compliance and REACH (EC 1907/2006) regulations current as of June 14, 2023, ensuring environmental regulatory adherence for global industrial applications.