S-90759A200 5/16"-18 Flange Nuts

Key Features & Benefits at a Glance

• Superior corrosion resistance with black-oxide steel construction for extended service life in harsh industrial environments
• Enhanced torque transmission through external 12-point drive design, preventing tool slippage during high-torque applications
• Precision thread engagement with Class 3B thread fit ensuring vibration resistance and reliable fastening integrity
• Integrated washer functionality from the 17/32" flange diameter, distributing load evenly and reducing surface damage
• Quick installation efficiency with coarse UNC threading that resists cross-threading and speeds assembly processes
• Standard hex profile compatibility allowing use with common wrenching tools while maintaining compact 3/8" width
• Durable flange construction with 0.08" thickness providing stable bearing surface for long-term joint stability

Professional Applications & Engineering Value

This black-oxide steel flange nut delivers exceptional engineering value in demanding applications where vibration resistance and corrosion protection are critical. The external 12-point drive configuration enables high-torque installation in confined spaces, while the integrated flange eliminates the need for separate washers, reducing assembly time and part count. The Class 3B thread fit with UNC coarse threading ensures reliable performance in high-vibration environments such as heavy machinery, automotive assemblies, and structural frameworks. The black-oxide surface treatment provides corrosion resistance without significantly altering dimensional tolerances, making these flange nuts ideal for OEM manufacturing and maintenance applications where consistent performance and durability are paramount.

Specification Summary & Compliance

Manufactured to precise dimensional standards with Class 3B thread fit tolerances and UNC thread specifications. The nut features right-hand threading with 5/16"-18 coarse thread spacing, 17/32" flange diameter, and 0.08" flange thickness. Complies with industry standards for inch measurement system fasteners and meets material specifications for industrial applications. The black-oxide steel construction provides corrosion resistance while maintaining mechanical properties required for demanding fastening applications.