S-98687A308 4.3 mm ID x 9 mm OD DIN 125; ISO 7089 General Purpose Washers

Key Features & Benefits at a Glance

• Enhanced corrosion resistance with black oxide steel finish, 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
• Standardized compliance with DIN 125 and ISO 7089 specifications, guaranteeing interchangeability and reliability across metric systems
• Optimized load distribution through 9mm OD design, preventing surface damage and maintaining joint integrity
• Regulatory assurance with full RoHS 3 and REACH compliance, meeting strict environmental and safety standards for global supply chains
• Consistent thickness control (0.7-0.9mm) for uniform pressure application and simplified assembly processes

Professional Applications & Engineering Value

These M4 metric flat washers deliver critical engineering solutions where dimensional accuracy and corrosion resistance are paramount. The black oxide steel construction provides superior protection against oxidation in humid or chemically aggressive environments, while the precise 4.3mm internal diameter ensures perfect alignment with M4 fasteners in automotive assemblies, machinery frames, and electrical enclosures. Manufactured to DIN 125 and ISO 7089 standards, these washers maintain consistent performance in vibration-prone applications, preventing loosening and distributing clamp load effectively across 9mm outer diameter surfaces. The controlled 0.7-0.9mm thickness tolerance enables reliable stacking in multi-washer configurations common in precision equipment manufacturing and industrial maintenance.

Specification Summary & Compliance

This flat washer features metric dimensions (4.3mm ID × 9mm OD × 0.7-0.9mm thickness) manufactured to DIN 125 and ISO 7089 standards for dimensional precision and mechanical properties. The product maintains full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, including the latest SVHC updates. Material certification confirms black oxide steel construction with hardness suitable for general industrial applications where specific hardness ratings aren't specified.