S-91190A640 50.5 mm ID x 67 mm OD DIN 7980 Split Lock Washers for Socket Head Screws

Key Features & Benefits at a Glance

• Superior vibration resistance ensures critical fasteners remain securely locked under dynamic loads and mechanical stress
• Black-oxide steel construction provides excellent corrosion resistance and durability in harsh industrial environments
• Rockwell C44 hardness rating delivers reliable spring action and maintains locking force over repeated use cycles
• Precision 50.5mm ID and 67mm OD dimensions guarantee perfect fit for M48 screws and uniform load distribution
• DIN 7980 compliance ensures consistent quality and interchangeability in European engineering applications
• 7.7-8.3mm thickness range offers optimal deflection for maximum locking performance while accommodating manufacturing tolerances
• Full regulatory compliance with RoHS 3 and REACH standards eliminates supply chain restrictions for global projects

Professional Applications & Engineering Value

This M48 split lock washer addresses critical vibration-induced loosening in heavy machinery, construction equipment, and industrial assemblies. The black-oxide steel material provides essential corrosion protection while maintaining the Rockwell C44 hardness necessary for consistent spring performance. Engineered to DIN 7980 standards, this metric lock washer delivers reliable vibration resistance in high-stress applications where fastener security is paramount. The split lock design creates continuous upward force against the nut or bolt head, preventing rotational loosening caused by equipment vibration, thermal cycling, or dynamic loading conditions. This makes it ideal for industrial washers applications in manufacturing plants, transportation infrastructure, and heavy equipment maintenance where M48 screw fasteners require permanent, reliable locking solutions.

Specification Summary & Compliance

This standard split lock washer features precise dimensions of 50.5mm internal diameter and 67mm outer diameter with 7.7-8.3mm thickness range. Manufactured to DIN 7980 specifications for dimensional accuracy and performance consistency. The product maintains full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental responsibility and unrestricted use across global industrial markets.