S-91117A222 0.406" ID x 2" OD Oversized Washers

Key Features & Benefits at a Glance

• Superior corrosion resistance with zinc-plated steel construction, extending service life in harsh industrial environments
• Optimal load distribution thanks to the 2" outer diameter, preventing surface damage and maintaining joint integrity
• Precise fit for 3/8" screws with 0.406" inner diameter, ensuring secure fastening and reducing installation errors
• Consistent thickness tolerance between 0.235" and 0.265" for uniform pressure application and reliable performance
• Enhanced durability with Rockwell B40 hardness, resisting deformation under heavy loads
• Global compliance assurance meeting RoHS 3 and REACH standards for safe, regulated use in international markets
• Heavy-duty reliability in inch measurement system, compatible with standard industrial equipment and replacement parts

Professional Applications & Engineering Value

This zinc-plated steel flat washer delivers critical engineering solutions where vibration resistance and corrosion protection are paramount. The 0.406" ID provides exact compatibility with 3/8" screws, eliminating play and ensuring precise alignment in assembled components. With its substantial 2" OD, it effectively distributes clamping force across wider surfaces, preventing material indentation in soft substrates and maintaining bolt tension in high-stress applications. The zinc plating creates a sacrificial barrier against oxidation, making it ideal for outdoor equipment, automotive assemblies, and machinery exposed to moisture. Manufacturing facilities benefit from the consistent 0.235-0.265" thickness which streamlines automated installation while the Rockwell B40 hardness guarantees dimensional stability under repeated loading cycles.

Specification Summary & Compliance

This flat washer features inch system dimensions with 0.406" inner diameter and 2" outer diameter, manufactured to standard flat washer specifications for 3/8" screw size. The thickness tolerance of 0.235-0.265" ensures precision fitment, while the Rockwell B40 hardness provides consistent mechanical properties. The product is fully compliant with RoHS 3 (2015/863/EU) under exemption 6(a) for lead as an alloying element in steel and meets REACH (EC 1907/2006) requirements as of January 17, 2023, including 233 SVHC substances, ensuring regulatory adherence for industrial distribution.