S-90673A111 1/4"-28 Locknuts

Key Features & Benefits at a Glance

• Superior vibration resistance through top lock distorted thread design that maintains secure fastening under dynamic loads
• Enhanced corrosion protection with black-oxide steel finish for extended service life in demanding environments
• Precise thread engagement with Class 2B fit and 1/4"-28 UNF fine threads ensuring reliable, consistent performance
• High-strength construction meeting Grade 5 specifications for heavy-duty industrial applications
• Easy installation and removal with standard 7/16" external hex drive compatible with common tools
• Regulatory compliance assurance with REACH and RoHS 3 certifications for global market acceptance
• Optimized locking performance through distorted thread technology that eliminates the need for additional locking components

Professional Applications & Engineering Value

This Grade 5 black-oxide steel locknut delivers exceptional engineering value in applications where vibration-induced loosening poses significant reliability concerns. The top lock distorted thread technology creates controlled interference that maintains clamping force without damaging mating threads, making it ideal for industrial machinery, automotive assemblies, and heavy equipment. The 1/4"-28 UNF fine thread configuration provides superior resistance to vibrational loosening compared to coarse threads, while the black-oxide surface treatment offers reliable corrosion protection without compromising dimensional accuracy. Engineered for maximum holding power in high-stress environments, this external hex locknut eliminates the need for secondary locking devices, streamlining assembly processes and reducing total installed cost.

Specification Summary & Compliance

This heavy-duty locknut features 1/4"-28 UNF fine threads with Class 2B thread fit for precision engagement and consistent performance. Manufactured to Grade 5 strength specifications with standard 7/16" hex width and 1/4" height dimensions. The product is fully compliant with REACH (EC 1907/2006) regulations and RoHS 3 (2015/863/EU) directives, ensuring environmental responsibility and global market acceptance. The top lock distorted thread design follows industry-standard locking principles for reliable vibration resistance in demanding applications.