S-90565A335 5/8"-18 SAE J995 Hex Nuts

Key Features & Benefits at a Glance

• Maximum Load-Bearing Capacity: Grade 8 strength classification ensures reliable performance under high-stress and heavy-duty applications, reducing the risk of fastener failure.
• Precise Thread Engagement: Class 2B thread fit provides consistent, vibration-resistant connections, minimizing loosening in dynamic environments.
• Superior Material Durability: High-quality steel construction offers excellent resistance to wear, corrosion, and extreme operational conditions.
• Standardized Compatibility: Complies with SAE J995 specifications and UNF fine thread standards, ensuring interchangeability and ease of sourcing.
• Enhanced Torque Transmission: High-profile external hex design allows for secure tool engagement and efficient installation with standard wrenches.
• Environmental & Regulatory Safety: RoHS 3 and REACH compliance guarantees adherence to strict environmental standards, suitable for global supply chains.
• Optimized Dimensions: 15/16" width and 27/32" height provide a robust form factor for secure fastening in confined or high-clearance assemblies.

Professional Applications & Engineering Value

This Grade 8 steel hex nut is engineered to address critical challenges in industrial and mechanical systems where vibration, heavy loads, and environmental factors compromise fastener integrity. The 5/8"-18 UNF fine thread design, combined with a Class 2B thread fit, ensures tight, reliable connections that resist loosening under dynamic stresses—making it ideal for machinery, automotive, construction, and aerospace applications. The high-profile external hex drive facilitates quick, secure installation with standard tools, while the SAE J995 compliance guarantees consistent performance metrics. Its robust steel build and RoHS/REACH-compliant finish further enhance longevity, reducing maintenance cycles and total cost of ownership in demanding operational environments.

Specification Summary & Compliance

This hex nut adheres to SAE J995 standards with a Class 2B thread fit for precise dimensional accuracy. It features a 5/8"-18 UNF fine thread with right-hand direction and is manufactured from high-strength Grade 8 steel. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and regulatory alignment for industrial use.