S-90949A018 1/4"-28 Flange Nuts

Key Features & Benefits at a Glance

• Superior vibration resistance through distorted thread locking technology that maintains clamp force in high-stress environments
• Enhanced corrosion protection with black-phosphate steel coating that withstands industrial environments and extends service life
• Precise thread engagement with Class 2B thread fit ensuring reliable mating with UNF fine-threaded components
• Integrated flange design eliminates need for separate washers while providing 9/16" bearing surface for improved load distribution
• High-strength performance meeting Grade G specifications for demanding automotive and machinery applications
• Standard hex profile with external drive style enables easy installation using common wrenching tools
• Environmental compliance with RoHS 3 standards for use in regulated industrial and international markets

Professional Applications & Engineering Value

This Grade G flange locknut addresses critical vibration-induced loosening challenges in automotive assemblies, heavy machinery, and industrial equipment. The distorted thread locking mechanism creates consistent interference fit along the 1/4"-28 UNF fine threads, providing permanent fastening without requiring additional locking elements. The black-phosphate steel construction offers superior corrosion resistance in harsh operating conditions, while the integrated 9/16" flange distributes clamping pressure across wider surface areas, preventing component damage and maintaining joint integrity. This engineered solution combines vibration resistance with environmental protection for applications where reliability cannot be compromised.

Specification Summary & Compliance

Manufactured to precise dimensional standards including Class 2B thread fit for optimal engagement with mating components. The UNF (Unified National Fine) thread form with 1/4"-28 thread size and right-hand direction ensures compatibility with standard industrial fasteners. Compliant with RoHS 3 (2015/863/EU) environmental regulations and manufactured to Grade G strength classification for consistent performance in critical applications. The standard hex profile (7/16" width) and external drive style provide industry-standard installation compatibility.