S-98099A031 0.406" ID x 1" OD Oversized Washers

Key Features & Benefits at a Glance

• Enhanced corrosion resistance from black-oxide steel finish, extending service life in harsh industrial environments
• Precise dimensional fit with 0.406" ID specifically engineered for 3/8" screws, ensuring secure fastening and load distribution
• Optimized surface coverage with 1" OD providing superior bearing surface area to prevent material damage and loosening
• Durable steel construction offering reliable mechanical strength and repeated use capability in demanding applications
• Consistent thickness control between 0.168-0.193" for uniform compression and predictable performance under load
• Global compliance assurance meeting RoHS 3 and REACH standards for safe, regulated use in international markets
• Inch system compatibility ensuring seamless integration with existing imperial measurement equipment and components

Professional Applications & Engineering Value

This black-oxide steel flat washer delivers critical engineering solutions where corrosion resistance and dimensional precision are paramount. The black-oxide surface treatment creates a protective barrier against moisture and chemical exposure, significantly reducing failure rates in outdoor, marine, and industrial environments. With its precise 0.406" inner diameter engineered specifically for 3/8" screw size applications, this washer ensures perfect fitment while the 1" outer diameter provides optimal load distribution across connected surfaces. The controlled thickness range maintains consistent clamping force in assembly operations, preventing joint relaxation and material deformation. These industrial washers serve essential functions in machinery assembly, structural steel connections, automotive components, and heavy equipment where reliable performance under vibration and load cycling is required.

Specification Summary & Compliance

This flat washer features inch system dimensions with 0.406" inner diameter, 1" outer diameter, and thickness ranging 0.168-0.193". Manufactured from black-oxide steel for enhanced durability, the product maintains standard flat washer geometry for universal compatibility. Compliance includes RoHS 3 (2015/863/EU) compliant with exemption 6(a) for lead as an alloying element in steel, and REACH (EC 1907/2006) compliant with the latest SVHC requirements as of 01/17/2023, ensuring regulatory adherence for global industrial applications.