S-98858A105 5/8"-11 Cap Nuts

Key Features & Benefits at a Glance

• Superior corrosion resistance with zinc-plated steel construction, extending service life in harsh industrial environments
• Heavy-duty load capacity through Grade 5 strength classification, ensuring reliable performance under high stress conditions
• Quick installation efficiency with UNC coarse threading and Class 2B fit, reducing assembly time while maintaining secure fastening
• Enhanced tool engagement via external hex drive design, providing superior torque transmission and slip resistance
• Complete thread protection with standard cap nut profile, safeguarding threads from damage and contamination
• Regulatory compliance assurance with RoHS 3 certification, meeting international environmental standards for industrial applications
• Optimized dimensional stability with precise 15/16" width and 1" height, ensuring consistent performance across multiple installations

Professional Applications & Engineering Value

This Grade 5 zinc-plated steel cap nut delivers exceptional engineering value through its robust UNC coarse thread design and external hex drive configuration. The 5/8"-11 thread size with Class 2B fit provides superior vibration resistance in heavy machinery, construction equipment, and structural applications where loosening under dynamic loads is a critical concern. The zinc plating creates a sacrificial barrier against corrosion, significantly extending fastener life in outdoor or chemically aggressive environments. The cap nut design completely encloses thread ends, preventing moisture ingress and protecting against mechanical damage in automated systems and precision equipment. These features combine to solve common industrial challenges of fastener degradation, maintenance frequency, and assembly reliability.

Specification Summary & Compliance

Manufactured to precise UNC thread standards with Class 2B thread fit tolerance for consistent engagement. The Grade 5 strength classification ensures mechanical properties meet industrial requirements for heavy-duty applications. Compliant with RoHS 3 (2015/863/EU) regulations with exemption 6(a)-I for lead as an alloying element in steel. Dimensions include 15/16" width across flats and 1" height with right-hand thread direction and 5/8" thread depth for secure fastening performance.