S-91030A028 1/4"-20 Flange Nuts

Key Features & Benefits at a Glance

• Enhanced load distribution with 5/8" flange diameter prevents surface damage and reduces the need for separate washers
• Superior corrosion resistance from black-oxide steel finish ensures long-term durability in harsh industrial environments
• Quick installation with UNC coarse threading and Class 2B fit provides smooth assembly and reliable thread engagement
• Secure torque transmission through external hex drive design allows for high-tightening force with standard tools
• Reduced component count with integrated flange design simplifies inventory and lowers assembly costs
• Regulatory compliance with RoHS 3 and REACH standards ensures safe usage in global industrial markets
• Consistent performance with standard hex nut profile guarantees compatibility with existing fastener systems

Professional Applications & Engineering Value

This black-oxide steel flange nut delivers exceptional engineering value through its integrated design that solves common industrial fastening challenges. The 5/8" flange diameter distributes clamping force over a wider area, preventing joint loosening from vibration while protecting soft materials from damage. The UNC coarse threading with Class 2B fit ensures rapid installation in high-volume assembly operations, reducing labor time without compromising connection integrity. Manufactured from black-oxide coated steel, this flange nut provides reliable corrosion resistance for automotive, machinery, and construction applications where environmental exposure is a concern. The combination of external hex drive and standard hex nut profile makes it compatible with common torque tools, streamlining maintenance procedures across industrial equipment and structural frameworks.

Specification Summary & Compliance

This flange nut maintains precise Class 2B thread fit according to UNC standards, ensuring consistent engagement with mating components. The 1/4"-20 coarse thread specification follows established industrial threading protocols for reliable performance. Manufacturing complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, confirming the absence of restricted substances. The product meets standard dimensional requirements for external hex drive flange nuts with right-hand threading, providing guaranteed interchangeability within industrial fastener systems.