S-98687A201 4.3 mm ID x 9 mm OD DIN 125; ISO 7089 General Purpose Washers

Key Features & Benefits at a Glance

• Enhanced corrosion resistance and visual identification through blue dyed steel construction, ideal for organized assembly and moderate environmental exposure.
• Precise fit and reliable load distribution with a 4.3mm inner diameter specifically designed for M4 screws, ensuring secure fastening.
• Superior surface coverage and stability provided by the 9mm outer diameter, effectively preventing surface damage and embedding.
• Consistent performance under pressure due to Rockwell B76 hardness, offering excellent durability and resistance to deformation.
• Guaranteed dimensional accuracy and interchangeability by conforming to DIN 125 and ISO 7089 international standards.
• Safe for use in regulated industries with full compliance to RoHS 3 and REACH environmental directives.
• Optimized for space-constrained applications with a thin profile (0.7-0.9mm thickness) without sacrificing strength.

Professional Applications & Engineering Value

This M4 flat washer is engineered from blue dyed steel to address common industrial challenges such as part misidentification and premature corrosion in assembly lines. The metric sizing, including the precise 4.3mm ID for M4 screws and 9mm OD, ensures perfect alignment and distributes clamping force effectively, preventing joint loosening and damage to connected surfaces. Its Rockwell B76 hardness provides the necessary resilience to maintain shape under vibrational stresses, making it a reliable component in machinery, automotive sub-assemblies, and electrical enclosures. The flat washer design, compliant with DIN 125 and ISO 7089, guarantees seamless integration into global supply chains, reducing downtime and replacement costs.

Specification Summary & Compliance

This washer features an Inner Diameter of 4.3mm, Outer Diameter of 9mm, and Thickness of 0.7-0.9mm, manufactured to standard metric dimensions for M4 screw sizes. It meets the precise dimensional and tolerance requirements of DIN 125 and ISO 7089 standards. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it is free of hazardous substances and safe for various industrial applications.