S-98029A031 0.406" ID x 0.875" OD Oversized Washers

Key Features & Benefits at a Glance

• Superior corrosion protection with black-oxide steel finish, extending service life in demanding environments.
• Precise dimensional fit for 3/8" screws with 0.406" ID, ensuring secure fastening and load distribution.
• Optimized load bearing surface with 0.875" OD, effectively preventing surface damage and loosening.
• Consistent performance guaranteed by a controlled thickness range of 0.105-0.130".
• Global regulatory compliance with RoHS 3 and REACH, facilitating international supply chain integration.
• Durable steel construction providing reliable strength for repetitive industrial assembly tasks.
• Inch system compatibility for seamless integration with existing North American equipment and standards.

Professional Applications & Engineering Value

This black-oxide steel flat washer delivers critical engineering value in industrial fastening systems. The black-oxide surface treatment provides enhanced corrosion resistance without significantly altering dimensions, making it ideal for applications where moisture or chemical exposure is a concern. The precise 0.406" inner diameter ensures perfect alignment with 3/8" fasteners, eliminating play that could lead to joint failure. With its 0.875" outer diameter, it effectively distributes clamping force across a wider area, protecting soft materials from damage and maintaining bolt preload in vibrating machinery. These industrial washers are engineered to maintain integrity in automotive assemblies, construction equipment, and heavy machinery where reliable performance under stress is non-negotiable.

Specification Summary & Compliance

Manufactured to inch system standards with dimensions: ID 0.406", OD 0.875", Thickness 0.105-0.130". Compliant with RoHS 3 (2015/863/EU) under exemption 6(a) for lead as an alloying element in steel and REACH (EC 1907/2006) regulations. Designed specifically for use with 3/8" screw sizes in various industrial applications.