S-90339A204 Easy-Install Slotted Washers

Key Features & Benefits at a Glance

• Superior corrosion resistance with black-oxide steel finish, extending service life in harsh industrial environments
• Precision-engineered 9/32" slot width ensures perfect alignment and secure fastening with 1/4" screws
• Exceptional durability backed by Rockwell B40 hardness rating for reliable performance under heavy loads
• Optimized 0.5" outer diameter provides maximum bearing surface area for improved load distribution
• Comprehensive regulatory compliance with RoHS 3 and REACH standards for global manufacturing applications
• Consistent dimensional accuracy with 0.056-0.071" thickness range ensuring uniform performance across batches
• Enhanced mechanical protection through slotted design that prevents rotation and maintains fastener integrity

Professional Applications & Engineering Value

This black-oxide steel slotted washer delivers critical engineering solutions for industrial applications where corrosion resistance and mechanical reliability are paramount. The precisely engineered 0.5" OD with 9/32" slot width ensures perfect compatibility with 1/4" screws, preventing misalignment in assembly operations. The Rockwell B40 hardness provides exceptional resistance to deformation under load, while the black-oxide surface treatment creates a protective barrier against oxidation and environmental degradation. Ideal for heavy-duty mechanical systems, automotive assemblies, and industrial machinery, this washer maintains fastener integrity through its anti-rotation slot design, reducing maintenance frequency and downtime in demanding operational conditions.

Specification Summary & Compliance

Manufactured to precise inch system specifications with 0.5" outer diameter, 0.056-0.071" thickness range, 9/32" slot width, and 3/8" slot depth. Engineered specifically for 1/4" screw applications with Rockwell B40 hardness rating. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, meeting the latest environmental standards for industrial components. The slotted washer design follows industry-standard manufacturing practices for consistent dimensional accuracy and reliable performance in mechanical fastening systems.