S-90339A033 Easy-Install Slotted Washers

Key Features & Benefits at a Glance

• Enhanced corrosion resistance with black-oxide steel finish, extending service life in demanding industrial environments.
• Superior load distribution from the 1.25" outer diameter, minimizing surface pressure and preventing material damage.
• Precision slot compatibility with 11/32" width and 3/4" depth for secure tool engagement during installation.
• Exceptional mechanical strength due to Rockwell 15N80 hardness, resisting deformation under high-torque applications.
• Reliable screw retention designed specifically for 5/16" fasteners, ensuring stable assembly connections.
• Regulatory compliance assurance meeting RoHS 3 and REACH standards for safe global industrial use.
• Consistent dimensional accuracy with thickness maintained between 0.303-0.323" for uniform performance.

Professional Applications & Engineering Value

Engineered for heavy-duty industrial applications, this black-oxide steel slotted washer addresses critical challenges in machinery assembly and structural fastening. The Rockwell 15N80 hardness rating provides exceptional resistance to wear and deformation, making it ideal for high-vibration environments where 5/16" screw systems require maintained clamping force. The slotted design with precise 11/32" width and 3/4" depth enables quick visual inspection and secure tool engagement during maintenance operations. Its corrosion-resistant black-oxide finish extends service life in manufacturing plants, automotive assemblies, and outdoor equipment where moisture and chemical exposure are concerns, while the generous 1.25" OD effectively distributes load across softer materials.

Specification Summary & Compliance

This slotted washer maintains dimensional precision with thickness tolerance of 0.303-0.323" and is manufactured to inch system standards for 5/16" screw compatibility. The product fully complies with RoHS 3 (2015/863/EU) under exemption 6(a) for lead alloying in steel and REACH (EC 1907/2006) regulations updated to January 2023 SVHC list, ensuring environmental responsibility and global market acceptance for industrial fastener applications.