S-90673A117 7/8"-14 Locknuts

Key Features & Benefits at a Glance

• Superior vibration resistance through distorted thread top lock design that maintains clamping force in high-stress environments
• Enhanced durability and corrosion protection with black-oxide steel construction for extended service life
• Reliable fine thread engagement with 7/8"-14 UNF Class 2B threads ensuring precise fit and consistent performance
• Heavy-duty Grade 5 strength rating providing excellent mechanical properties for demanding industrial applications
• Easy installation and removal with standard 1 5/16" external hex drive compatible with common tools
• Environmental compliance assurance meeting both REACH and RoHS 3 standards for safe industrial use
• Optimized 13/16" height profile offering space-efficient design without compromising locking performance

Professional Applications & Engineering Value

This Grade 5 black-oxide steel locknut addresses critical vibration-induced loosening challenges in industrial machinery, heavy equipment, and automotive assemblies. The distorted thread top lock technology creates consistent interference along the UNF fine threads, generating reliable prevailing torque that resists rotational forces. The external hex drive facilitates straightforward installation with standard wrenches while the black-oxide surface treatment provides essential corrosion resistance in demanding environments. Engineered for applications where vibration resistance and long-term fastening integrity are paramount, this 7/8"-14 locknut delivers predictable performance across temperature variations and dynamic loading conditions common in manufacturing, construction, and transportation sectors.

Specification Summary & Compliance

Manufactured to precise Class 2B thread fit standards with 7/8"-14 UNF fine threads in right-hand orientation. The distorted thread top lock configuration ensures consistent locking performance while maintaining Grade 5 mechanical properties. Compliant with REACH (EC 1907/2006) and RoHS 3 (2015/863/EU) environmental regulations, with dimensional specifications of 1 5/16" width across flats and 13/16" height. Designed for reliable performance in industrial fastening applications requiring vibration-resistant locking solutions.