S-98029A035 0.656" ID x 1.375" OD Oversized Washers

Key Features & Benefits at a Glance

• Superior corrosion resistance from the black-oxide steel finish, extending service life in demanding environments
• Precise dimensional fit with 0.656" ID and 1.375" OD, ensuring reliable performance with 5/8" fasteners
• Enhanced load distribution across a wide surface area, reducing point stress and material fatigue
• Consistent thickness control (0.105-0.130") for uniform clamping force and vibration resistance
• Full regulatory compliance with RoHS 3 and REACH standards, meeting global environmental requirements
• Industrial-grade durability from steel construction, suitable for heavy-duty mechanical applications
• Universal inch system compatibility for seamless integration with existing equipment and fasteners

Professional Applications & Engineering Value

This black-oxide steel flat washer delivers critical engineering value through its corrosion-resistant properties and precise dimensional stability. The black-oxide surface treatment creates a protective barrier against moisture and chemical exposure, making it ideal for industrial applications in manufacturing, construction, and outdoor equipment where environmental factors degrade standard washers. The controlled 0.105-0.130" thickness range ensures consistent compression and reliable vibration resistance in assembled components. Engineered for 5/8" fasteners, this washer maintains joint integrity under dynamic loads while preventing galvanic corrosion between dissimilar metals. Its heavy-duty construction addresses common failure points in machinery by distributing loads evenly across mating surfaces.

Specification Summary & Compliance

Manufactured to standard inch dimensions with 0.656" inner diameter and 1.375" outer diameter, this flat washer maintains precise dimensional tolerances for consistent performance. The product complies with RoHS 3 (2015/863/EU) under exemption 6(a) for lead as an alloying element in steel and meets REACH (EC 1907/2006) compliance standards as of January 17, 2023. The black-oxide steel construction provides reliable mechanical properties for general industrial use without specific hardness rating requirements.