S-90504A112 4.3 mm ID x 9 mm OD DIN 137B Wave Spring Lock Washers

Key Features & Benefits at a Glance

• Superior vibration damping to prevent fastener loosening in high-stress environments
• Consistent spring action maintains reliable tension and load distribution across assemblies
• Enhanced corrosion resistance from black-oxide steel coating for extended service life
• Precision DIN 137B compliance ensures dimensional accuracy and interchangeability
• Rockwell C42 hardness provides excellent durability and resistance to deformation
• Environmental compliance with RoHS 3 and REACH standards for safe industrial use
• Optimized M4 sizing (4.3mm ID/9mm OD) for perfect fit with standard metric fasteners

Professional Applications & Engineering Value

Our M4 wave washers deliver critical vibration resistance in demanding applications where constant motion and thermal cycling compromise joint integrity. The unique wave spring design creates persistent axial force that compensates for material relaxation and thermal expansion, making these black-oxide steel washers ideal for automotive assemblies, electrical enclosures, and machinery subjected to repetitive stress. The DIN 137B standard ensures precise dimensional control for reliable performance in metric fastener systems, while the Rockwell C42 hardness prevents flattening under cyclic loads. This combination of spring characteristics and corrosion-resistant surface treatment solves common industrial challenges of maintenance frequency and premature component failure.

Specification Summary & Compliance

Manufactured to DIN 137B specifications with precise dimensions: 4.3mm internal diameter, 9mm outer diameter, and 2mm overall height. Constructed from black-oxide steel with Rockwell C42 hardness rating. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental standards, ensuring safe use across global industrial markets. Designed specifically for M4 screw applications with consistent spring performance and dimensional accuracy.