S-91343A200 5/16"-18 Flange Nuts

Key Features & Benefits at a Glance

• Superior vibration resistance through serrated locking technology that prevents loosening under dynamic loads
• Exceptional corrosion resistance with 316 stainless steel construction for harsh or chemical environments
• Integrated flange design eliminates need for separate washers while distributing load over wider surface area
• Reliable coarse threading (UNC) enables faster assembly and reduced cross-threading risk in industrial applications
• Precision Class 2B thread fit ensures consistent engagement and optimal clamping force retention
• External hex drive compatibility with standard tools for efficient installation and maintenance
• Full regulatory compliance with RoHS 3 and REACH standards for global industrial applications

Professional Applications & Engineering Value

This 316 stainless steel flange locknut delivers critical performance advantages in demanding environments where vibration-induced loosening and corrosion compromise fastener integrity. The serrated locking mechanism beneath the flange creates permanent resistance to rotational forces, making it ideal for machinery, transportation equipment, and structural assemblies subject to constant motion or impact loads. The UNC coarse thread profile combined with Class 2B thread fit provides rapid installation while maintaining precise tolerances. The integrated flange design offers dual benefits: eliminating separate washer components and providing superior bearing surface distribution. Manufactured from 316 stainless steel, this hex locknut maintains structural integrity in marine, chemical processing, and outdoor applications where moisture and corrosive agents degrade ordinary fasteners.

Specification Summary & Compliance

This flange locknut features 5/16"-18 UNC coarse threads with Class 2B thread fit for consistent engagement. The external hex drive (1/2" width) accommodates standard tools, while the 11/16" flange diameter provides enhanced load distribution. The product fully complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material traceability for industrial procurement requirements.