S-90504A122 21 mm ID x 36 mm OD DIN 137B Wave Spring Lock Washers

Key Features & Benefits at a Glance

• Superior vibration resistance maintains consistent clamping force in dynamic applications
• Optimal load distribution prevents surface damage and extends component lifespan
• Black-oxide steel construction provides excellent corrosion resistance for harsh industrial environments
• Precision DIN 137B compliance ensures reliable performance in metric fastener systems
• Rockwell C42 hardness rating delivers exceptional durability under repeated compression cycles
• Environmental compliance meets RoHS 3 and REACH standards for global manufacturing requirements
• Perfect M20 screw compatibility with 21mm ID ensures secure fit and consistent spring action

Professional Applications & Engineering Value

These M20 wave washers engineered from black-oxide steel address critical industrial challenges where vibration-induced loosening compromises assembly integrity. The wave design creates constant spring tension that compensates for thermal expansion, material relaxation, and mechanical settling in metric fastener systems. The DIN 137B specification guarantees precise dimensional accuracy and consistent spring characteristics, making these washers ideal for automotive subassemblies, heavy machinery, and precision equipment where reliable vibration damping is essential. The black-oxide surface treatment provides an additional layer of corrosion protection without significantly altering the washer's dimensions, maintaining the critical 1.6mm thickness for optimal deflection properties in space-constrained applications.

Specification Summary & Compliance

Manufactured to DIN 137B standards with precise metric dimensions (21mm ID × 36mm OD × 1.6mm thickness), these wave washers maintain dimensional accuracy for M20 screw applications. The Rockwell C42 hardness ensures consistent spring performance across temperature variations. Compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations confirms environmental responsibility and global manufacturing suitability, while the black-oxide finish enhances corrosion resistance without compromising the washer's mechanical properties.