S-90313A507 0.25" ID x 0.562" OD Oversized Washers

Key Features & Benefits at a Glance

• Superior corrosion resistance from 18-8 Stainless Steel construction, ideal for harsh environments and long-term reliability.
• Excellent load distribution with a 0.562" outer diameter, protecting surfaces and preventing fastener embedment.
• Precise fit for No. 12 screws with a 0.25" inner diameter, ensuring secure and stable assembly.
• Consistent performance and durability backed by a Rockwell B68 hardness rating, resisting deformation under pressure.
• Reliable dimensional stability with a controlled thickness range of 0.040" to 0.060", guaranteeing uniform spacing and clamping force.
• Safe for regulated industries with full compliance to RoHS 3 and REACH, meeting strict environmental and safety standards.
• Versatile inch-system compatibility, making them easy to integrate into existing North American machinery and equipment designs.

Professional Applications & Engineering Value

These 18-8 Stainless Steel flat washers are engineered to solve common industrial challenges such as galvanic corrosion, surface damage, and joint failure. The corrosion-resistant material is essential for applications in chemical processing, marine hardware, and food-grade equipment, where moisture and corrosive agents are prevalent. The precise 0.25" ID and 0.562" OD ensure a perfect match for No. 12 screw sizes, distributing clamp load effectively to prevent loosening from vibration or thermal cycling. With a Rockwell B68 hardness, these washers maintain their form under high stress, making them a reliable choice for industrial washers in automotive assemblies, electrical enclosures, and structural frameworks where long-term integrity is non-negotiable.

Specification Summary & Compliance

This flat washer meets standard inch-system dimensional requirements with an inner diameter of 0.25", outer diameter of 0.562", and thickness ranging from 0.040" to 0.060". It is manufactured from 18-8 Stainless Steel and hardened to Rockwell B68 for consistent mechanical properties. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it is free of hazardous substances and safe for use in global markets.