S-90895A121 0.126" ID x 0.217" OD Heavy-Vibration-Resistant Spring Lock Washers for Socket Head Screws

Key Features & Benefits at a Glance

• Superior vibration resistance through spring lock design prevents fastener loosening in high-motion applications
• Enhanced locking capability with dual top and bottom serrations provides maximum grip on mating surfaces
• Exceptional durability with Rockwell C42 hardness rating ensures long-term performance under mechanical stress
• Reliable corrosion protection from zinc-plated steel construction extends service life in various environments
• Precision dimensional fit with 0.126" ID specifically engineered for No. 4 screw applications
• Optimal load distribution through 0.217" OD design minimizes surface pressure and material deformation
• Regulatory compliance assurance with RoHS 3 and REACH standards for safe industrial usage

Professional Applications & Engineering Value

This zinc-plated steel spring lock washer delivers critical engineering solutions for vibration-prone assemblies requiring reliable fastener security. The innovative dual serration design on both top and bottom surfaces creates multiple biting edges that significantly enhance locking performance compared to standard washers. This feature is particularly valuable in industrial applications where constant motion, thermal cycling, or mechanical stress would typically cause conventional fasteners to loosen. The Rockwell C42 hardness ensures the washer maintains its spring tension and serration effectiveness through repeated loading cycles, while the zinc plating provides essential corrosion resistance for extended service life in demanding environments. Engineered specifically for No. 4 screw sizes with precise 0.126" ID dimensions, this component offers installers confidence in critical connections across electronics, machinery, automotive, and aerospace assemblies.

Specification Summary & Compliance

This spring lock washer features inch system dimensions including 0.126" internal diameter, 0.217" outer diameter, and 0.037" overall height with 0.020" thickness. Manufactured to exacting standards with Rockwell C42 hardness for consistent performance. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring adherence to the latest environmental and safety standards for industrial components.