S-91235A315 4.2 mm ID x 9 mm OD Heavy-Vibration-Resistant Spring Lock Washers

Key Features & Benefits at a Glance

• Exceptional spring-back performance maintains consistent tension and prevents loosening under vibration in demanding applications
• Premium 17-7 PH stainless steel construction provides excellent corrosion resistance and maintains mechanical properties in harsh environments
• Optimized dimensional design with 4.2mm ID and 9mm OD ensures perfect fit and reliable performance with M4 fasteners
• Rockwell C38 hardness rating delivers superior durability and long-term reliability in high-stress assemblies
• Precision 0.9mm thickness offers optimal deflection characteristics while maintaining structural integrity
• Full regulatory compliance with RoHS 3 and REACH standards ensures environmental safety and global market acceptance
• 1.3mm overall height provides effective locking action while maintaining compact assembly profiles

Professional Applications & Engineering Value

This M4 spring lock washer engineered from 17-7 PH stainless steel addresses critical vibration-induced loosening challenges in industrial assemblies. The precipitation-hardened stainless steel material maintains its spring properties and corrosion resistance even in extreme temperature variations and aggressive environments. The precise 4.2mm internal diameter ensures secure seating on M4 screws, while the 9mm outer diameter provides optimal bearing surface distribution. This spring lock washer is particularly valuable in aerospace, automotive, and heavy machinery applications where vibration resistance and material integrity are paramount. The combination of Rockwell C38 hardness and controlled deflection characteristics makes it ideal for maintaining bolt preload in dynamic loading conditions, significantly reducing maintenance requirements and improving overall assembly reliability.

Specification Summary & Compliance

This precision spring lock washer features exact dimensional specifications including 4.2mm internal diameter, 9mm outer diameter, 0.9mm thickness, and 1.3mm overall height, engineered for M4 screw applications. Manufactured from 17-7 PH stainless steel with Rockwell C38 hardness certification, the component delivers consistent mechanical performance. The washer is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, meeting the latest environmental safety standards for industrial components. This ensures suitability for global markets and applications requiring strict regulatory adherence.