S-92908A155 0.281" ID x 1.25" OD Finishing Washers

Key Features & Benefits at a Glance

• Enhanced corrosion resistance through Black-Oxide Steel surface treatment, ideal for humid or chemically aggressive industrial environments.
• Precise 82° countersink angle ensures flush mounting with standard countersunk screws, preventing snagging and improving assembly aesthetics.
• Optimized load distribution with 1.25" OD and 0.281" ID, reducing surface pressure and material fatigue under high-stress conditions.
• Superior hardness rating of Rockwell 15N80 provides excellent wear resistance and maintains dimensional stability during repeated use.
• Reliable regulatory compliance with RoHS 3 and REACH standards, ensuring safe use in regulated industries without performance trade-offs.
• Accurate screw compatibility for 1/4" fasteners, enabling quick installation and reducing assembly errors in time-sensitive operations.
• Consistent thickness tolerance (0.271-0.291") guarantees uniform clamping force and vibration resistance in mechanical systems.

Professional Applications & Engineering Value

This 82° countersunk washer in Black-Oxide Steel addresses critical engineering challenges in heavy-duty industrial applications where corrosion and mechanical stress are prevalent. The specialized countersunk design allows seamless integration with 1/4" screws, eliminating protrusions that could compromise equipment safety or interfere with moving parts. Its Rockwell 15N80 hardness ensures the washer withstands high cyclic loads without deformation, while the Black-Oxide finish provides a durable barrier against oxidation in harsh environments like outdoor machinery, automotive assemblies, and marine equipment. By combining precise dimensional control (1.25" OD, 0.281" ID) with robust material properties, this washer delivers reliable performance in vibration-prone systems and helps extend the service life of connected components.

Specification Summary & Compliance

Manufactured to inch system standards with critical dimensions including 1.25" OD, 0.281" ID, and thickness ranging 0.271-0.291". The 82° countersink angle conforms to common fastener specifications for flush installation. Compliance includes RoHS 3 (2015/863/EU) with exemption 6(a) for lead in steel alloys and full adherence to REACH (EC 1907/2006) regulations, ensuring environmental and safety standards are met for industrial distribution and use.