S-91117A216 0.344" ID x 2" OD Oversized Washers

Key Features & Benefits at a Glance

• Enhanced corrosion resistance through zinc plating protects against rust and extends service life in demanding environments.
• Superior load distribution with a large 2" outer diameter minimizes surface pressure and prevents fastener embedding.
• Reliable mechanical strength from Rockwell B40 hardness steel ensures the washer maintains shape under high stress.
• Precise compatibility with 5/16" screw sizes and a 0.344" inner diameter guarantees secure, vibration-resistant fastening.
• Consistent performance due to a controlled thickness range of 0.235-0.265" for uniform clamping force.
• Compliance with strict regulations including RoHS 3 and REACH ensures safe, sustainable use in global industrial supply chains.
• Durable material construction using zinc-plated steel offers excellent wear resistance for long-term reliability.

Professional Applications & Engineering Value

This zinc-plated steel flat washer is engineered to address common industrial challenges such as joint loosening, surface damage, and corrosion-induced failure. Its robust Rockwell B40 hardness and substantial outer diameter provide optimal load spreading, making it ideal for heavy-duty applications in construction, machinery assembly, and automotive sectors. The corrosion-resistant zinc plating ensures reliable performance in humid or outdoor environments, reducing maintenance needs. By maintaining dimensional accuracy for 5/16" screw sizes, it prevents misalignment and enhances the integrity of bolted connections, delivering long-term engineering value and operational safety.

Specification Summary & Compliance

This flat washer features an inner diameter of 0.344", outer diameter of 2", and thickness range of 0.235-0.265", designed for use with 5/16" screw sizes in inch measurement systems. Manufactured from zinc-plated steel with a hardness of Rockwell B40, it complies with RoHS 3 (2015/863/EU) under exemption 6(a) for lead in steel alloys and is REACH (EC 1907/2006) compliant, meeting the latest substance regulations as of January 17, 2023.