S-92918A135 0.203" ID x 0.5" OD Finishing Washers

Key Features & Benefits at a Glance

• Enhanced corrosion resistance with black zinc-plated brass construction for reliable performance in humid or demanding environments
• Precise flush-mounting capability due to the 82° countersink angle that ensures smooth, professional finishes in countersunk screw applications
• Accurate dimensional fit with 0.203" ID and 0.5" OD, providing secure seating and load distribution for No. 8 screws
• Durable brass core offering excellent machinability and resistance to galling, reducing installation issues and maintenance needs
• Compliance with stringent regulations including RoHS 3 and REACH, ensuring safe use in global markets and sensitive applications
• Corrosion-resistant surface finish that maintains appearance and function, extending service life in exposed assemblies
• Ideal for inch-system projects with standardized dimensions that streamline sourcing and integration in North American industrial designs

Professional Applications & Engineering Value

This black zinc-plated brass countersunk washer is engineered to address common challenges in precision assembly, such as corrosion-induced failure and improper screw seating. The 82° countersink angle aligns perfectly with standard countersunk screws, preventing protrusion and ensuring a smooth surface—critical in aerospace, electronics, and architectural hardware where aesthetics and safety are paramount. Made from brass, it resists seizing and offers reliable conductivity, making it suitable for electrical grounding applications. The black zinc plating adds an extra layer of protection against oxidation, reducing maintenance costs in outdoor or high-moisture settings. By combining dimensional accuracy (0.203" ID for No. 8 screws) with robust materials, this washer enhances load distribution and minimizes stress concentrations, ultimately improving the longevity and reliability of fastened joints in industrial equipment and consumer durables.

Specification Summary & Compliance

This washer adheres to inch system measurements with precise dimensions: 0.203" inner diameter (ID), 0.5" outer diameter (OD), and 0.112" overall height, designed for No. 8 screw sizes. It features an 82° countersink angle for compatibility with standard countersunk fasteners. The product conforms to RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it is free from hazardous substances and safe for various industrial and consumer applications. Note that hardness is not rated, focusing instead on material durability and compliance for reliable performance.