S-90673A108 7/8"-9 Locknuts

Key Features & Benefits at a Glance

• Superior vibration resistance through distorted thread locking technology that prevents loosening under extreme dynamic loads
• Enhanced corrosion protection with black-oxide steel finish for extended service life in demanding industrial environments
• Heavy-duty performance with Grade 5 strength classification, ensuring reliable fastening in critical applications
• Quick installation with standard external hex drive design compatible with common wrench tools
• Precise thread engagement through Class 2B thread fit that maintains consistent locking performance
• Environmental compliance meeting both REACH and RoHS 3 standards for safe industrial use
• Optimized for coarse threading with 7/8"-9 UNC specification providing excellent resistance to cross-threading

Professional Applications & Engineering Value

This Grade 5 black-oxide steel locknut delivers exceptional engineering value through its distorted thread locking mechanism that actively counters vibration-induced loosening in heavy machinery, construction equipment, and automotive assemblies. The coarse UNC thread profile ensures rapid installation while maintaining Class 2B thread fit precision, reducing assembly time without compromising security. The black-oxide surface treatment provides reliable corrosion resistance in industrial environments where moisture and chemicals are present. Engineered specifically for heavy-duty applications requiring consistent performance under extreme vibration and load conditions, this external hex locknut solves critical fastening challenges in manufacturing, infrastructure, and mechanical systems where failure is not an option.

Specification Summary & Compliance

This locknut features 7/8"-9 UNC coarse threading with Class 2B thread fit tolerance for precise engagement. Manufactured to Grade 5 strength classification standards with distorted top lock thread technology. Dimensions include 1 5/16" width and 13/16" height with right-hand thread direction. Fully compliant with REACH (EC 1907/2006) and RoHS 3 (2015/863/EU) environmental regulations for industrial safety and sustainability requirements.