S-93413A312 0.375" ID x 0.875" OD ASME B18.21.1 Oversized Washers

Key Features & Benefits at a Glance

• Exceptional load distribution with 0.875" outer diameter for reduced surface pressure and material deformation
• Superior corrosion resistance through black protective coating, extending service life in harsh environments
• Grade 8 strength certification ensures reliable performance under high-stress industrial applications
• Precision dimensional control with 0.375" inner diameter providing secure fit for 5/16" fasteners
• Enhanced durability from Rockwell C38 hardness rating, resisting wear and deformation
• Regulatory compliance with RoHS 3 and REACH standards for safe, environmentally conscious manufacturing
• Industry-standard compatibility meeting ASME B18.21.1 specifications for consistent quality and interchangeability

Professional Applications & Engineering Value

These Grade 8 USS flat washers deliver critical engineering solutions where vibration resistance and load distribution are paramount. The black corrosion-resistant coated steel construction addresses common industrial challenges including exposure to moisture, chemicals, and outdoor elements, significantly reducing maintenance frequency and replacement costs. With their Rockwell C38 hardness and precise dimensional tolerances, these 5/16" washers prevent fastener loosening in heavy machinery, structural steel connections, and automotive assemblies. The robust 0.875" outer diameter provides optimal surface coverage while the 0.375" inner diameter ensures secure seating on standard inch system fasteners, making them ideal for construction, manufacturing, and equipment maintenance applications requiring dependable industrial washers.

Specification Summary & Compliance

Manufactured to exacting ASME B18.21.1 specifications with dimensional precision (ID: 0.375", OD: 0.875", Thickness: 0.090-0.110"). The black corrosion-resistant coated steel construction meets Grade 8 strength requirements with Rockwell C38 hardness certification. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe usage across global industrial markets.