S-92538A352 0.125" ID x 0.438" OD Finishing Washers

Key Features & Benefits at a Glance

• Superior corrosion resistance from 18-8 stainless steel construction, ideal for harsh environments and long-term outdoor use
• Precise 100° countersink angle ensures flush, professional finishes with No. 4 screws, eliminating protrusions and snagging
• Optimized dimensional accuracy with 0.125" ID and 0.438" OD for perfect fit and even load distribution on No. 4 fasteners
• Enhanced durability with Rockwell B83 hardness, providing reliable performance under vibration and mechanical stress
• Full regulatory compliance with RoHS 3 and REACH standards, ensuring safe use in industrial and consumer applications
• Consistent thickness (0.084-0.104") maintains uniform pressure and prevents joint loosening in dynamic assemblies
• Seamless integration with inch-system components, simplifying procurement and installation in North American markets

Professional Applications & Engineering Value

These 100° countersunk washers are engineered to solve critical challenges in precision assembly where flush surface mounting is essential. Made from 18-8 stainless steel, they provide exceptional corrosion resistance in demanding environments like marine equipment, food processing machinery, and outdoor structural frameworks. The precise countersink angle and dimensional tolerances ensure that No. 4 screws sit perfectly flush, eliminating surface irregularities that can compromise aesthetics or safety. This design is particularly valuable in aerospace panels, electronic enclosures, and automotive trim, where vibration resistance and a smooth finish are non-negotiable. The Rockwell B83 hardness further enhances reliability, preventing deformation under load and extending service life in high-cycle applications.

Specification Summary & Compliance

This countersunk washer features a 100° countersink angle, 0.125" inner diameter, 0.438" outer diameter, and thickness range of 0.084-0.104", designed specifically for No. 4 screw applications in inch measurement systems. Manufactured from 18-8 stainless steel with a hardness of Rockwell B83, it meets standard dimensional and mechanical requirements for industrial fasteners. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring adherence to environmental and safety standards for hazardous substances.