S-90313A320 0.938" ID x 3.25" OD Oversized Washers

Key Features & Benefits at a Glance

• Superior corrosion resistance thanks to 18-8 stainless steel construction, ideal for harsh industrial environments
• Optimal load distribution with a large 3.25" outer diameter, reducing stress and preventing surface damage
• Precise fit for 7/8" screws with a 0.938" inner diameter, ensuring secure fastening and alignment
• Enhanced durability from a substantial thickness (0.365-0.397"), providing long-lasting performance under heavy loads
• Compliance with environmental standards, including RoHS 3 and REACH, for safe and sustainable use
• Broad industrial compatibility with inch system measurements, fitting standard equipment and applications
• Reliable mechanical performance in demanding settings, from machinery assembly to structural fastening

Professional Applications & Engineering Value

This 18-8 stainless steel flat washer is engineered to address common industrial challenges such as fastener loosening, material fatigue, and corrosion-induced failure. Its robust 3.25" OD and 0.938" ID ensure even load distribution, minimizing point stress on connected surfaces—critical in heavy machinery, construction, and marine applications where vibration and load fluctuations occur. The corrosion-resistant properties of 18-8 stainless steel make it suitable for outdoor, chemical-exposed, or high-moisture environments, reducing maintenance needs and extending service life. As a flat washer designed for 7/8" screw size, it provides reliable performance in bolted joints, supporting everything from structural steelwork to industrial equipment assembly while complying with RoHS and REACH for environmental safety.

Specification Summary & Compliance

This flat washer adheres to inch system dimensions with an inner diameter of 0.938", outer diameter of 3.25", and thickness ranging from 0.365" to 0.397", ensuring precision fit for 7/8" screw size. Manufactured from 18-8 stainless steel, it meets general industry standards for mechanical washers without a specific hardness rating. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its suitability for industrial applications requiring environmental and safety adherence.