S-98099A029 0.281" ID x 0.625" OD Oversized Washers

Key Features & Benefits at a Glance

• Superior corrosion resistance thanks to the black-oxide steel finish, extending the washer's service life in demanding environments.
• Precise fit for 1/4" fasteners with a 0.281" inner diameter, ensuring secure and stable load distribution.
• Enhanced load-bearing surface area from the 0.625" outer diameter, which helps prevent surface damage and fastener embedment.
• Consistent thickness tolerance between 0.168" and 0.193" for uniform pressure application and reliable joint integrity.
• Full compliance with major environmental regulations including RoHS 3 and REACH, ensuring safe use in regulated industries.
• Durable steel construction provides excellent strength and longevity for heavy-duty industrial applications.
• Designed for the inch measurement system, offering seamless integration with standard North American components and specifications.

Professional Applications & Engineering Value

These 1/4" flat washers are engineered from black-oxide steel to address common industrial challenges such as corrosion, galvanic reactions, and joint failure. The black-oxide surface treatment provides a protective layer that significantly reduces oxidation, making these washers ideal for outdoor equipment, automotive assemblies, and machinery exposed to moisture. Their precise 0.281" ID and 0.625" OD ensure a perfect fit for 1/4" screws, distributing clamp load effectively to prevent material crushing and loosening under vibration. This design is critical for maintaining structural integrity in construction, manufacturing, and MRO applications, where reliable performance under stress is non-negotiable.

Specification Summary & Compliance

This flat washer is manufactured to standard inch system dimensions with an inner diameter of 0.281", outer diameter of 0.625", and a thickness range of 0.168" to 0.193". It is designed for use with 1/4" screw sizes and is compliant with RoHS 3 (2015/863/EU) under exemption 6(a) for lead in steel alloys, and fully adheres to REACH (EC 1907/2006) regulations, including the latest SVHC updates as of January 2023.