S-90630A121 3/8"-16 Locknuts

Key Features & Benefits at a Glance

• Superior vibration resistance with nylon insert locking that maintains secure fastening even under continuous motion and shock loads
• High-strength Grade 8 steel construction ensures reliable performance in heavy-duty applications with exceptional load-bearing capacity
• Wide temperature tolerance with nylon insert rated up to 220°F for consistent locking performance in various operating environments
• Precision UNC coarse threading provides quick installation and reliable engagement with mating components
• Standard external hex design enables easy installation and removal using common wrench tools
• Class 2B thread fit guarantees proper mating with Class 2A bolts for secure assembly without binding
• Compliance with industry standards including REACH and RoHS 3 ensures environmental responsibility and workplace safety

Professional Applications & Engineering Value

This Grade 8 steel nylon insert locknut delivers exceptional engineering value through its robust construction and reliable locking mechanism. The nylon insert creates consistent friction against mating threads, effectively preventing loosening from vibration - a critical solution for machinery, automotive, and industrial equipment where vibration-induced failure poses significant safety risks. The UNC coarse thread design ensures rapid assembly in production environments while maintaining strong holding power. With its 220°F temperature rating, this locknut performs reliably in engine compartments, industrial machinery, and outdoor equipment exposed to thermal cycling. The external hex drive style provides compatibility with standard tools, streamlining maintenance procedures while the heavy-duty steel construction withstands extreme mechanical stresses in demanding applications.

Specification Summary & Compliance

This locknut features precision 3/8"-16 UNC coarse threads with Class 2B thread fit for optimal compatibility with Class 2A threaded components. The standard 9/16" hex profile and 29/64" height provide dimensional consistency for uniform installation. Manufactured to meet Grade 8 strength requirements, this component complies with REACH (EC 1907/2006) and RoHS 3 (2015/863/EU) environmental standards, ensuring regulatory compliance for industrial applications worldwide.