S-91117A219 0.406" ID x 2" OD Oversized Washers

Key Features & Benefits at a Glance

• Enhanced corrosion resistance with zinc plating, extending service life in demanding industrial environments
• Optimal load distribution from the 2" outer diameter, preventing surface damage and joint loosening
• Precise fit for 3/8" screws with 0.406" inner diameter, ensuring secure fastening and vibration resistance
• Consistent performance guaranteed by Rockwell B40 hardness, maintaining shape under high pressure
• Durable steel construction providing reliable strength for heavy-duty mechanical applications
• Compliance with global regulations including RoHS 3 and REACH, ensuring safe use in regulated industries
• Versatile thickness range of 0.110-0.140" accommodating various assembly requirements and gap fill needs

Professional Applications & Engineering Value

This zinc-plated steel flat washer delivers critical engineering solutions where corrosion resistance and structural integrity are paramount. The inch system sizing ensures compatibility with North American machinery and 3/8" screw assemblies commonly found in construction, automotive, and heavy equipment manufacturing. The zinc plating actively protects against rust in humid or outdoor settings, while the Rockwell B40 hardness prevents deformation under sustained loads. Engineers specify this flat washer to distribute clamping force evenly, reduce wear on connected surfaces, and maintain bolt preload in vibrating systems—effectively addressing common failure points in industrial applications.

Specification Summary & Compliance

Manufactured to standard inch system dimensions with 0.406" ID, 2" OD, and 0.110-0.140" thickness range. The flat washer meets material and manufacturing specifications for general-purpose industrial use. Compliant with RoHS 3 (2015/863/EU) under exemption 6(a) for lead in steel alloys and REACH (EC 1907/2006) regarding SVHC substances as of 01/17/2023, ensuring regulatory adherence for global supply chains.