S-90328A106 1/4"-20 Locknuts

Key Features & Benefits at a Glance

• Superior vibration resistance through integrated external-tooth lock washer that bites into mating surfaces
• Enhanced corrosion protection with black zinc plating on steel construction for extended service life
• Reliable thread engagement with Class 2B thread fit ensuring consistent performance in industrial environments
• Quick installation with standard 7/16" hex profile and coarse UNC threads for efficient assembly
• Durable locking mechanism combining steel lock washer with right-hand threading for secure fastening
• Compliance assurance meeting RoHS 3 and REACH environmental standards for global applications
• Optimal torque transmission through external hex drive design for proper installation and removal

Professional Applications & Engineering Value

This heavy-duty 1/4"-20 UNC locknut addresses critical vibration-induced loosening challenges in industrial machinery, automotive assemblies, and equipment manufacturing. The black zinc-plated steel construction provides essential corrosion resistance while the integrated external-tooth lock washer creates permanent mechanical locking by embedding into contact surfaces. The coarse UNC thread profile ensures rapid installation in high-volume production environments, while the Class 2B thread fit maintains consistent clamping force without galling or cross-threading issues. Engineered for applications where thermal cycling, dynamic loads, and constant vibration threaten fastener integrity, this locking nut solution delivers reliable performance in demanding conditions from manufacturing plants to transportation equipment.

Specification Summary & Compliance

This locknut features 1/4"-20 UNC coarse threads with Class 2B thread fit per ASME B1.1 standards, ensuring proper dimensional accuracy and interchangeability. The assembly includes a steel external-tooth lock washer with 0.5" outer diameter, creating a complete vibration-resistant fastening system. Manufacturing complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming environmental compliance for industrial and commercial applications worldwide. The external hex drive (7/16" width) and standard profile facilitate proper tool engagement and torque application.