S-98180A120 0.344" ID x 0.688" OD ASME B18.21.1 SAE Washers

Key Features & Benefits at a Glance

• Exceptional load distribution with 0.688" outer diameter and 0.344" inner diameter, preventing surface damage and loosening under high stress
• Superior corrosion resistance from zinc-flake coated steel construction, ensuring longevity in harsh industrial environments
• Maximum durability and reliability with Rockwell C38 hardness, maintaining structural integrity under heavy loads
• High-strength performance meeting Grade 8 standards, suitable for critical heavy-duty applications
• Precise dimensional consistency manufactured to ASME B18.21.1 specifications, guaranteeing proper fit with 5/16" fasteners
• Environmental compliance assurance with RoHS 3 and REACH standards, meeting global regulatory requirements
• Optimized thickness range (0.055-0.065") providing consistent spacing and vibration resistance in inch system assemblies

Professional Applications & Engineering Value

This Grade 8 SAE flat washer delivers critical engineering solutions for industrial applications where fastener failure is not an option. The zinc-flake coated steel construction provides superior corrosion protection in demanding environments, from manufacturing equipment to structural assemblies. With its 5/16" screw size compatibility and precise dimensional control, it eliminates common issues like bolt loosening and surface deformation under extreme vibration and load conditions. The Rockwell C38 hardness ensures the washer maintains its shape and function even when subjected to repeated heavy loading cycles. These heavy-duty washers are engineered to prevent joint failure in critical connections, making them ideal for construction machinery, automotive assemblies, and industrial equipment where reliable fastening performance is paramount.

Specification Summary & Compliance

Manufactured to exact ASME B18.21.1 specifications with precise dimensional tolerances for consistent performance. Features 0.344" inner diameter and 0.688" outer diameter with thickness ranging 0.055-0.065" for optimal load distribution. The Grade 8 classification ensures high-strength capabilities, while the Rockwell C38 hardness provides exceptional durability. Full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental standards, meeting current regulatory requirements for industrial use.