S-91117A255 1.062" ID x 3.5" OD Oversized Washers

Key Features & Benefits at a Glance

• Superior corrosion resistance with zinc plating, extending service life in harsh industrial environments.
• Exceptional load distribution due to the large 3.5" outer diameter, preventing surface damage and joint loosening.
• Precise fit for 1" screws with a 1.062" inner diameter, ensuring easy installation and secure fastening.
• Consistent performance and durability from Rockwell B40 hardness, resisting deformation under high stress.
• Reliable thickness tolerance (0.360-0.390") for uniform compression and stable assembly in repetitive applications.
• Compliance with major environmental regulations (RoHS 3 and REACH), making it suitable for global supply chains and sensitive projects.
• Versatile for heavy-duty use in construction, machinery, and automotive sectors where strength and corrosion resistance are critical.

Professional Applications & Engineering Value

This zinc-plated steel flat washer is engineered to address common industrial challenges such as corrosion-induced failure and uneven load distribution. The zinc plating provides a protective barrier against moisture and chemicals, significantly enhancing corrosion resistance in outdoor or high-humidity settings. Its large 3.5" OD and precise 1.062" ID ensure optimal surface contact and secure fit for 1" screw size applications, reducing the risk of bolt loosening and material fatigue. With a Rockwell B40 hardness, it maintains structural integrity under heavy loads, making it ideal for heavy-duty washers in construction, machinery assembly, and automotive frameworks where reliability and longevity are paramount.

Specification Summary & Compliance

This flat washer adheres to standard inch measurement specifications with an inner diameter of 1.062", outer diameter of 3.5", and thickness ranging from 0.360" to 0.390". It is designed for use with 1" screws and features a Rockwell B40 hardness for consistent performance. The product is manufactured in compliance with RoHS 3 (2015/863/EU) under exemption 6(a) for lead as an alloying element in steel and is REACH (EC 1907/2006) compliant, ensuring it meets stringent environmental and safety standards for industrial applications.