S-91855A115 7/8"-9 Cap Nuts

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction, ideal for harsh environments and extended service life
• Robust load-bearing capability from the coarse UNC thread design, ensuring secure fastening under high vibration and stress
• Precise thread engagement with Class 2B fit, minimizing cross-threading risks and improving assembly efficiency
• Easy installation and removal using standard tools thanks to the external hex drive and standard cap nut profile
• Enhanced safety compliance meeting RoHS 3 and REACH regulations, suitable for regulated industrial applications
• Durable right-hand threading providing reliable performance in standard rotational assembly systems
• Optimal sealing and protection with the enclosed cap design, preventing contamination and offering a finished appearance

Professional Applications & Engineering Value

This 7/8"-9 UNC cap nut delivers critical reliability in heavy-duty industrial applications where vibration resistance and corrosion prevention are paramount. The 18-8 stainless steel material combats rust and chemical exposure, making it suitable for outdoor machinery, marine equipment, and chemical processing plants. Its coarse thread spacing and Class 2B thread fit enable quick, accurate installations—reducing assembly errors and maintenance downtime. The external hex drive allows for high-torque tightening with common wrenches, ensuring tight seals in structural assemblies, pipeline systems, and large-scale mechanical frames. Engineered for longevity, this nut maintains integrity under dynamic loads, supporting operational safety and reducing lifecycle costs.

Specification Summary & Compliance

This cap nut adheres to Unified Coarse (UNC) thread standards with a Class 2B thread fit for consistent dimensional accuracy. It features a 7/8"-9 thread size, 1 1/4" width, and 1 23/64" height in the inch measurement system. The product is manufactured to comply with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it is free of hazardous substances and safe for industrial use.