S-91455A410 4.3 mm ID x 9 mm OD DIN 125; ISO 7089 General Purpose Washers

Key Features & Benefits at a Glance

• Superior corrosion resistance with zinc-flake coating that provides excellent protection against rust and harsh industrial environments
• Enhanced load distribution thanks to precise 9mm OD and 4.3mm ID dimensions that prevent surface damage and maintain joint integrity
• Exceptional durability with Rockwell B91 hardness ensuring the washer maintains shape under high pressure and repeated use
• Reliable dimensional consistency meeting DIN 125 and ISO 7089 standards for guaranteed interchangeability in metric assemblies
• Optimized for M4 screw applications with 0.7-0.9mm thickness providing ideal spacing and vibration resistance
• Environmental compliance assurance with RoHS 3 and REACH compliance eliminating regulatory concerns for global supply chains
• Cost-effective maintenance reduction through long-lasting steel construction that minimizes replacement frequency

Professional Applications & Engineering Value

This M4 flat washer delivers critical engineering solutions where vibration resistance and corrosion protection are paramount. The zinc-flake coated steel construction creates a barrier against moisture and chemicals, significantly extending service life in automotive assemblies, electrical enclosures, and outdoor machinery. Its precision dimensions (4.3mm ID/9mm OD) ensure perfect alignment with M4 fasteners, preventing loosening under dynamic loads while the Rockwell B91 hardness maintains flatness under high clamp loads. Manufactured to DIN 125 and ISO 7089 specifications, these metric flat washers provide reliable performance in automated production environments where consistent thickness (0.7-0.9mm) prevents gapping and ensures uniform pressure distribution.

Specification Summary & Compliance

This flat washer features metric dimensions with 4.3mm internal diameter, 9mm outer diameter, and 0.7-0.9mm thickness range. Manufactured to DIN 125 and ISO 7089 standards ensuring dimensional precision and interchangeability. The zinc-flake coated steel construction provides consistent performance with Rockwell B91 hardness rating. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, including the latest SVHC updates, making it suitable for restricted substance-controlled applications.