S-91117A245 0.938" ID x 3.25" OD Oversized Washers

Key Features & Benefits at a Glance

• Superior corrosion resistance with zinc-plated steel construction, extending service life in harsh industrial environments.
• Exceptional load distribution from the large 3.25" outer diameter, minimizing surface pressure and preventing material damage.
• Precise fit for 7/8" screws with a 0.938" inner diameter, ensuring secure fastening and reducing assembly errors.
• Enhanced durability with Rockwell B40 hardness, offering reliable performance under high-stress conditions.
• Consistent thickness control between 0.110" and 0.140", providing uniform spacing and vibration resistance.
• Compliance with global standards including RoHS 3 and REACH, ensuring safe and sustainable use in regulated industries.
• Versatile inch system compatibility, making it easy to integrate into existing mechanical assemblies without conversion issues.

Professional Applications & Engineering Value

This zinc-plated steel flat washer is engineered to address common industrial challenges such as corrosion, loosening, and surface wear. The zinc plating provides a protective barrier against moisture and chemicals, ideal for outdoor equipment, machinery, and structural applications. With its large OD of 3.25" and precise ID for 7/8" screw size, it effectively distributes clamping force, reducing the risk of bolt fatigue and joint failure. The Rockwell B40 hardness ensures it maintains integrity under repetitive loads, making it a reliable choice for heavy-duty assemblies in construction, automotive, and manufacturing sectors where corrosion-resistant washers are critical for long-term performance.

Specification Summary & Compliance

This flat washer adheres to standard inch system dimensions with an inner diameter of 0.938", outer diameter of 3.25", and thickness ranging from 0.110" to 0.140". It is manufactured from zinc-plated steel with a hardness of Rockwell B40, ensuring consistent quality and performance. The product is fully compliant with RoHS 3 (2015/863/EU) under exemption 6(a) for lead in steel alloys and REACH (EC 1907/2006) as of January 17, 2023, meeting environmental and safety regulations for industrial use.