S-90477A114 1/2"-20 Flange Nuts

Key Features & Benefits at a Glance

• Enhanced corrosion resistance through black-oxide steel coating for extended service life in demanding industrial environments
• Superior vibration resistance with integrated flange design that eliminates the need for separate washers and maintains clamping force
• Precise thread engagement with Class 2B UNF fine threads ensuring reliable, secure fastening in critical applications
• Optimized installation efficiency through external hex drive design providing excellent torque transmission and tool accessibility
• Reduced assembly complexity with rotating performance properties that accommodate misalignment during installation
• Environmental compliance assurance meeting RoHS 3 standards for use in regulated industries and international markets
• Robust load distribution with 1 1/8" flange diameter and 0.22" thickness preventing surface damage and maintaining joint integrity

Professional Applications & Engineering Value

This black-oxide steel flange nut delivers exceptional engineering value through its integrated design that addresses common assembly challenges. The 1/2"-20 UNF fine thread configuration provides superior resistance to vibration loosening in automotive, machinery, and structural applications where dynamic loads are present. The rotating performance properties accommodate minor misalignments during installation, reducing assembly time and preventing cross-threading issues. The substantial 1 1/8" flange diameter distributes clamping force over a wider surface area, protecting softer materials and reducing the risk of surface deformation. Manufactured with Class 2B thread fit, this nut ensures consistent engagement with mating components while the external hex drive design facilitates efficient installation in confined spaces using standard tools.

Specification Summary & Compliance

This flange nut features precision Class 2B thread fit with UNF fine thread specification (1/2"-20) meeting established inch system standards. The component maintains dimensional accuracy with 7/8" width across flats and 23/32" height profile. Manufacturing compliance includes RoHS 3 (2015/863/EU) certification with exemption 6(a) for lead as an alloying element in steel, ensuring environmental regulation adherence for global industrial applications. The black-oxide steel construction provides consistent performance across temperature variations and demanding service conditions.