S-92908A489 0.203" ID x 1.25" OD Finishing Washers

Key Features & Benefits at a Glance

• Superior corrosion resistance from the black-oxide steel finish, extending service life in harsh industrial environments.
• Precise 100° countersink angle ensures a flush, professional finish with No. 10 screws, eliminating protrusions.
• Optimized dimensions (1.25" OD, 0.203" ID) provide a perfect fit and reliable load distribution for No. 10 screw applications.
• Enhanced durability with Rockwell 15N80 hardness, resisting deformation under high stress and vibration.
• Full RoHS 3 and REACH compliance guarantees environmental safety and meets strict international regulatory standards.
• Robust material strength in black-oxide steel ensures long-term performance in demanding mechanical assemblies.
• Wide industrial applicability due to inch system measurements, compatible with standard North American equipment and designs.

Professional Applications & Engineering Value

This 100° countersunk washer is engineered to solve critical issues in industrial fastening, such as surface unevenness and premature corrosion. The black-oxide steel construction provides a protective layer that significantly reduces rust and wear, making it ideal for outdoor machinery, automotive assemblies, and structural frameworks exposed to moisture. Its precise 1.25" OD and 0.203" ID ensures a snug fit with No. 10 screws, distributing clamp load evenly to prevent joint loosening under vibration. The 100° countersink angle allows screws to sit flush, eliminating snag hazards and improving aesthetics in finished products. By integrating high Rockwell 15N80 hardness, this washer maintains integrity in high-stress applications, reducing maintenance needs and downtime in sectors like manufacturing and construction.

Specification Summary & Compliance

This washer features inch system dimensions with an OD of 1.25", ID of 0.203", and thickness range of 0.130-0.151", designed specifically for No. 10 screws. It adheres to standard inch measurement tolerances and includes a 100° countersink angle for compatibility with common fasteners. The product is manufactured from black-oxide steel with a hardness of Rockwell 15N80, ensuring consistent performance. It is fully compliant with RoHS 3 (2015/863/EU) under exemption 6(a) for lead in steel and REACH (EC 1907/2006) as of January 17, 2023, meeting environmental and safety regulations for industrial use.