S-90509A034 1/4"-20 Square Nuts

Key Features & Benefits at a Glance

• Superior corrosion resistance thanks to brass construction, ideal for humid or corrosive industrial environments
• Easy manual installation and removal with 7/16" external square drive, requiring only basic wrenches
• Reliable, vibration-resistant fastening from Class 2B coarse UNC threading that maintains grip under stress
• Wide compatibility with standard 1/4"-20 UNC male threads commonly used in North American machinery
• Environmental compliance assurance meeting REACH and RoHS 3 standards for safe industrial use
• Durable long-term performance with brass material resisting galling and seizing during repeated use
• Quick visual alignment enabled by square nut design for faster assembly in tight spaces

Professional Applications & Engineering Value

This 1/4"-20 UNC brass square nut delivers critical advantages in demanding applications where corrosion resistance and reliable threading are paramount. The brass material inherently resists rust and galvanic corrosion, making it ideal for marine equipment, plumbing systems, and electrical enclosures exposed to moisture. Its coarse UNC thread profile provides excellent engagement with mating components, reducing cross-threading risks during high-volume assembly. The external square drive design allows for secure wrench gripping without rounding, enabling proper torque application in confined spaces where socket access is limited. Engineers specify this nut for industrial machinery, automotive systems, and outdoor structures where environmental compliance and long-term fastener integrity are non-negotiable requirements.

Specification Summary & Compliance

This square nut features precise Class 2B thread fit per UNC standards, ensuring consistent engagement with Class 2A external threads. Manufactured to inch system dimensions with 1/4"-20 coarse threading and 7/16" width. Fully compliant with REACH (EC 1907/2006) regulations and RoHS 3 (2015/863/EU) under exemption 6(a)-I for lead as steel alloying element. Right-hand thread direction provides standard rotation for installation and removal.