S-98040A102 4.3 mm ID x 14 mm OD Oversized Washers

Key Features & Benefits at a Glance

• Superior corrosion resistance with black-oxide steel construction, extending service life in demanding industrial environments
• Precise dimensional fit with 4.3mm ID specifically engineered for M4 screws, ensuring secure fastening and vibration resistance
• Enhanced load distribution through 14mm OD design, preventing surface damage and maintaining joint integrity
• Consistent performance guaranteed by Rockwell 15N80 hardness rating, providing reliable mechanical strength
• Regulatory compliance assurance with full RoHS 3 and REACH adherence, meeting global environmental standards
• Optimized thickness range (2.5-3.4mm) for versatile application requirements while maintaining structural stability
• Metric system compatibility for seamless integration with international engineering specifications and replacement parts

Professional Applications & Engineering Value

These M4 metric flat washers deliver critical engineering solutions through their black-oxide steel composition and precision manufacturing. The corrosion-resistant surface treatment specifically addresses premature failure in humid or chemically aggressive environments, while the controlled Rockwell 15N80 hardness ensures consistent performance under mechanical stress. Engineered with exacting 4.3mm internal diameter specifications, these industrial washers prevent loosening in M4 fastener assemblies subjected to vibration or thermal cycling. The optimized 14mm outer diameter provides superior load distribution across connected surfaces, making them ideal for precision applications in automotive subassemblies, electrical enclosures, and machinery where dimensional accuracy and regulatory compliance are paramount.

Specification Summary & Compliance

Manufactured to metric system standards with precise dimensional tolerances: 4.3mm ID, 14mm OD, and 2.5-3.4mm thickness range. Material specifications include black-oxide steel with Rockwell 15N80 hardness certification. Full compliance with RoHS 3 (2015/863/EU) under exemption 6(a) for lead as steel alloying element and REACH (EC 1907/2006) regulations updated to January 2023 SVHC list. These flat washers meet international industrial fastener requirements for environmental safety and mechanical performance.