S-98424A350 6.4 mm ID x 18 mm OD Finishing Washers

Key Features & Benefits at a Glance

• Flush surface integration with a 90° countersink angle for seamless mounting in M6 applications, eliminating protrusions and improving safety
• Enhanced corrosion resistance through zinc-plated steel construction, extending service life in humid or outdoor environments
• Precise dimensional fit with 6.4mm ID and 18mm OD ensuring secure fastening and even load distribution
• Metric system compatibility for global engineering projects, simplifying procurement and assembly processes
• Regulatory compliance assurance with RoHS 3 and REACH standards, meeting strict environmental and safety requirements
• Durable steel core providing reliable strength for repeated use in industrial fastening systems

Professional Applications & Engineering Value

This M6 zinc-plated steel countersunk washer is engineered to address common industrial challenges such as surface unevenness and corrosion-induced failure. The 90° countersink angle allows for a completely flush finish when used with corresponding screws, preventing snagging in machinery and improving aesthetic alignment in visible assemblies. Made from zinc-plated steel, it offers a protective barrier against oxidation, making it ideal for automotive, electrical enclosures, and outdoor structural applications where moisture exposure is a concern. Its metric dimensions ensure compatibility with standard M6 fasteners, providing consistent performance in high-vibration environments. By combining precise thread form with robust surface treatment, this washer reduces maintenance needs and enhances the longevity of connected components.

Specification Summary & Compliance

This countersunk washer adheres to metric system standards with an inner diameter of 6.4mm, outer diameter of 18mm, and overall height of 3.3mm, designed for use with M6 screw sizes. It conforms to RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, ensuring it is free from hazardous substances and suitable for regulated industries. The zinc-plated finish provides additional durability without compromising dimensional accuracy.