S-90377A128 0.281" ID x 0.688" OD Oversized Washers

Key Features & Benefits at a Glance

• Superior corrosion resistance with Black-Oxide 18-8 Stainless Steel construction, ideal for harsh industrial environments.
• Enhanced durability and wear resistance from Rockwell B68 hardness, ensuring long service life under heavy loads.
• Precise fit for 1/4" screws with 0.281" ID and 0.688" OD, minimizing loosening and improving assembly reliability.
• Consistent performance due to controlled thickness (0.060-0.090"), providing uniform load distribution.
• Environmental and safety compliance with RoHS 3 and REACH standards, safe for various applications.
• Broad compatibility with inch-system fasteners, simplifying sourcing and integration.
• Cost-effective maintenance by reducing corrosion-related replacements and downtime.

Professional Applications & Engineering Value

This flat washer is engineered to address common industrial challenges such as galvanic corrosion, vibration-induced failure, and inconsistent load bearing. Made from Black-Oxide 18-8 Stainless Steel, it provides excellent protection against moisture and chemicals, making it suitable for outdoor equipment, marine hardware, and chemical processing plants. The precise 1/4" screw size compatibility and robust Rockwell B68 hardness ensure secure fastening in high-stress assemblies, reducing the risk of joint failure. Its inch system dimensions facilitate easy integration with standard components, enhancing efficiency in manufacturing, construction, and automotive applications where reliability and compliance with environmental regulations are critical.

Specification Summary & Compliance

This washer features an ID of 0.281", OD of 0.688", and thickness range of 0.060-0.090", designed for use with 1/4" screws in inch-based systems. It meets industry standards for material quality and dimensional accuracy, with Rockwell B68 hardness ensuring mechanical strength. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming it is free from hazardous substances and safe for global supply chains.