S-90477A111 1/4"-28 Flange Nuts

Key Features & Benefits at a Glance

• Superior corrosion resistance through black-oxide steel construction, extending service life in harsh industrial environments
• Enhanced load distribution with 5/8" flange diameter, reducing surface pressure and preventing material damage
• Precise thread engagement with Class 2B fine UNF threads, ensuring reliable vibration resistance in rotating applications
• Quick installation and removal using standard external hex drive, compatible with common wrench tools
• Regulatory compliance assurance meeting both REACH and RoHS 3 standards for global industrial use
• Optimized mechanical performance through right-hand thread design and rotating capability for dynamic assemblies

Professional Applications & Engineering Value

This black-oxide steel flange nut delivers critical engineering solutions for industrial fastening applications where vibration resistance and corrosion protection are paramount. The UNF fine thread configuration maintains clamping force under dynamic loads, while the integrated 5/8" steel flange eliminates the need for separate washers, reducing assembly time and component count. The external hex drive enables high-torque installation in confined spaces, making it ideal for rotating machinery, automotive assemblies, and heavy equipment where reliability is non-negotiable. The black-oxide surface treatment provides durable protection against oxidation without compromising dimensional accuracy.

Specification Summary & Compliance

Manufactured to precise Class 2B thread fit standards with 1/4"-28 UNF fine threads and right-hand thread direction. Features a standard hex profile with 1/2" width and 3/8" height, coupled with a 0.13" thick steel flange. Fully compliant with REACH (EC 1907/2006) and RoHS 3 (2015/863/EU) environmental regulations for industrial deployment.