S-98858A291 7/8"-9 Cap Nuts

Key Features & Benefits at a Glance

• Superior corrosion protection with zinc plating that extends service life in demanding industrial environments
• High-strength Grade 5 construction ensures reliable performance under heavy loads and vibration
• Secure fastening with Class 2B thread fit provides consistent engagement and reduces cross-threading risks
• Easy installation and removal with external hex drive design for standard wrench compatibility
• Effective sealing capability with standard cap nut profile that protects threads and prevents contamination
• Optimized for coarse threading applications with 7/8"-9 UNC threads for faster assembly in tough materials
• Compliance with environmental standards through RoHS 3 certification for responsible manufacturing

Professional Applications & Engineering Value

This Grade 5 zinc-plated steel cap nut delivers exceptional engineering value in industrial settings where corrosion resistance and structural integrity are paramount. The 7/8"-9 UNC coarse thread configuration enables rapid installation in structural steel, heavy machinery, and construction equipment, while the Class 2B thread fit ensures consistent clamping force without galling or seizing. The zinc-plated finish provides critical protection against rust and chemical exposure in outdoor or high-moisture environments. As a cap nut, it effectively seals threaded ends against debris ingress and provides a finished appearance, making it ideal for applications requiring both mechanical strength and environmental protection in automotive, construction, and manufacturing sectors.

Specification Summary & Compliance

This 7/8"-9 UNC cap nut features Class 2B thread fit tolerances per ASME/ANSI standards, ensuring precise thread engagement. Manufactured from Grade 5 steel with external hex drive (1 1/4" width) and right-hand thread direction. Compliant with RoHS 3 (2015/863/EU) regulations with exemption 6(a)-I for lead as an alloying element in steel. The inch system measurement and standard cap nut profile guarantee compatibility with industrial fastening systems requiring reliable, high-strength components.