S-90673A113 3/8"-24 Locknuts

Key Features & Benefits at a Glance

• Superior vibration resistance through distorted thread top lock design, ensuring secure fastening in high-motion environments
• Enhanced corrosion protection with black-oxide steel coating, extending service life in harsh industrial conditions
• High-strength performance meeting Grade 5 standards, providing reliable load-bearing capacity for demanding applications
• Precise thread engagement with Class 2B fine UNF threads, delivering consistent clamping force and reducing loosening risks
• Easy installation and removal using standard external hex drive, compatible with common tools for efficient maintenance
• Compliance with environmental regulations including REACH and RoHS 3, ensuring safe use across global markets
• Optimized dimensions (9/16" width, 3/8" height) for space-constrained assemblies without compromising strength

Professional Applications & Engineering Value

This Grade 5 black-oxide steel locknut with distorted thread top lock technology addresses critical vibration-induced loosening in industrial machinery, automotive systems, and heavy equipment. The UNF 3/8"-24 fine thread configuration ensures tighter thread engagement compared to coarse threads, minimizing backlash in precision assemblies. The black-oxide surface treatment provides a durable barrier against moisture and chemicals, reducing maintenance frequency in corrosive environments. Engineered for Class 2B thread fit, it maintains consistent torque values and clamping force under dynamic loads, making it ideal for vibration-resistant applications where fastener integrity is paramount. The external hex design allows for high-torque installation using standard wrenches, streamlining assembly processes in manufacturing and repair operations.

Specification Summary & Compliance

This locknut features 3/8"-24 UNF fine threads with Class 2B fit tolerance for precise engagement, manufactured to Grade 5 strength standards. It complies with REACH (EC 1907/2006) and RoHS 3 (2015/863/EU) environmental directives, ensuring adherence to global regulatory requirements for hazardous substances. The distorted thread locking mechanism follows industry-accepted principles for vibration resistance, while the right-hand thread direction and standard hex profile ensure compatibility with common assembly specifications.