S-90790A419 7/8"-9 Cap Nuts

Key Features & Benefits at a Glance

• Superior corrosion protection with black-oxide coating for extended service life in demanding industrial environments
• Exceptional load distribution thanks to extra-wide high profile design that minimizes surface pressure and material stress
• Reliable coarse threading with 7/8"-9 UNC specification provides faster installation and reduced cross-threading risk
• Precise Class 2B thread fit ensures smooth engagement and consistent performance across multiple assembly cycles
• Robust external hex drive delivers superior torque transmission and tool access in confined spaces
• Environmental compliance assurance with REACH and RoHS 3 certifications for global industrial applications
• Optimal thread depth of 1-1/16" provides secure fastening for high-vibration applications

Professional Applications & Engineering Value

This black-oxide steel cap nut delivers exceptional engineering value through its extra-wide high profile design that significantly increases bearing surface area, effectively distributing clamp load and preventing material deformation in heavy-duty applications. The 7/8"-9 UNC coarse thread configuration combined with Class 2B fit ensures rapid installation while maintaining precise thread engagement, making it ideal for construction equipment, machinery frames, and structural assemblies where vibration resistance and quick maintenance access are critical. The black-oxide surface treatment provides reliable corrosion protection without dimensional interference, while the substantial 1-5/8" height and 1-3/8" width dimensions offer superior grip for high-torque applications in industrial manufacturing and infrastructure projects.

Specification Summary & Compliance

This heavy-duty cap nut features precise 7/8"-9 UNC coarse threads with Class 2B fit tolerance for consistent thread engagement. Manufacturing complies with industry standards for external hex drive configuration and right-hand thread direction. The component is fully compliant with REACH (EC 1907/2006) regulations and RoHS 3 (2015/863/EU) directive with exemption 6(a)-I for lead as an alloying element in steel, ensuring environmental responsibility while maintaining mechanical performance requirements for industrial applications.