S-98189A400 0.438" ID x 1" OD ASME B18.21.1 General Purpose Washers

Key Features & Benefits at a Glance

• Superior corrosion resistance from A286 stainless steel material, ideal for harsh industrial environments
• Exceptional durability with Rockwell C22 hardness for long-lasting performance under heavy loads
• Precise fit and distribution with 0.438" ID and 1" OD dimensions for optimal load bearing
• Reliable standardization through ASME B18.21.1 compliance ensuring consistent quality and interchangeability
• Environmental safety assurance with full RoHS 3 and REACH compliance for responsible manufacturing
• Versatile compatibility designed specifically for 3/8" screw sizes in inch system applications
• Optimized thickness range (0.064-0.104") providing flexibility while maintaining structural integrity

Professional Applications & Engineering Value

This A286 stainless steel USS flat washer delivers exceptional engineering value in demanding applications where corrosion resistance and structural reliability are paramount. The A286 material grade provides outstanding performance in high-temperature and corrosive environments, making it ideal for aerospace, chemical processing, and marine applications. The USS flat washer design with its substantial 1" outer diameter ensures superior load distribution, preventing surface damage and maintaining joint integrity under vibration and dynamic loads. Engineered to ASME B18.21.1 standards, this washer guarantees precise dimensional accuracy and consistent performance in critical assembly operations, reducing maintenance requirements and extending equipment service life.

Specification Summary & Compliance

This precision USS flat washer features exact dimensional specifications including 0.438" inner diameter, 1" outer diameter, and thickness ranging from 0.064" to 0.104" for 3/8" screw compatibility. Manufactured to ASME B18.21.1 standards with Rockwell C22 hardness certification, ensuring consistent quality and performance. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, meeting the latest environmental and safety requirements for industrial applications.