S-90477A030 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 load distribution through the 3/4" flange diameter, reducing surface pressure and preventing material damage
• Quick installation with UNC coarse threads and Class 2B fit, ensuring smooth engagement and reduced assembly time
• Secure anti-rotation performance with rotating properties that maintain tightness under vibration and dynamic loads
• Standard external hex drive provides compatibility with common tools for straightforward installation and removal
• Reliable material integrity with steel construction maintaining strength while meeting RoHS 3 environmental compliance
• Optimized flange design combining 0.14" thickness with 9/16" width for balanced strength-to-weight ratio

Professional Applications & Engineering Value

This black-oxide steel flange nut delivers exceptional engineering value through its integrated flange design that eliminates the need for separate washers, streamlining assembly processes in industrial applications. The UNC coarse thread configuration with Class 2B thread fit ensures rapid installation while maintaining secure fastening in high-vibration environments such as machinery, automotive assemblies, and structural frameworks. The rotating performance properties prevent loosening under dynamic loads, while the black-oxide surface treatment provides reliable corrosion protection without compromising the steel's inherent strength. This combination addresses critical industrial pain points including assembly efficiency, vibration resistance, and long-term durability in demanding operating conditions.

Specification Summary & Compliance

This flange nut features precision 5/16"-18 UNC coarse threads with Class 2B thread fit tolerance, ensuring consistent performance across industrial applications. The product maintains dimensional accuracy with 9/16" width across flats and 7/16" height for standardized tool compatibility. Manufactured from steel with black-oxide finish, the nut complies with RoHS 3 (2015/863/EU) regulations under exemption 6(a) for lead as an alloying element in steel, meeting international environmental standards while delivering reliable mechanical performance.