S-90949A016 1/4"-20 Flange Nuts

Key Features & Benefits at a Glance

• Vibration-resistant locking through distorted thread technology prevents loosening in high-stress environments
• Enhanced corrosion protection with black-phosphate steel coating extending service life in demanding conditions
• Integrated flange design with 9/16" diameter distributes load evenly, eliminating need for separate washers
• Grade G strength classification ensures reliable performance in heavy-duty industrial applications
• Quick installation with UNC coarse threading and external hex drive for efficient assembly
• Precision Class 2B thread fit provides consistent engagement and reliable fastening integrity
• Environmental compliance with RoHS 3 standards meets global regulatory requirements

Professional Applications & Engineering Value

This Grade G flange locknut addresses critical vibration-induced failure points in industrial machinery, automotive assemblies, and structural frameworks. The distorted thread locking mechanism creates permanent friction resistance without compromising the UNC coarse thread profile, maintaining full engagement strength while preventing spontaneous loosening. Manufactured from black-phosphate steel, the nut provides superior corrosion resistance in environments exposed to moisture, chemicals, and temperature variations. The integrated 9/16" flange serves as a built-in washer, distributing clamp load over wider surface areas to prevent material damage and maintain joint integrity. These engineering features make it ideal for heavy-duty applications where maintenance access is limited and reliability is paramount.

Specification Summary & Compliance

This flange locknut features 1/4"-20 UNC coarse threading with Class 2B thread fit tolerances ensuring precise mating with standard bolts. The external hex drive (7/16" width) accommodates standard wrenching tools for straightforward installation. Manufacturing complies with RoHS 3 (2015/863/EU) environmental standards, containing no restricted hazardous substances. The Grade G classification confirms consistent mechanical properties and load-bearing capacity suitable for industrial fastening requirements.