S-90509A029 4-40 Square Nuts

Key Features & Benefits at a Glance

• Superior corrosion resistance from high-quality brass construction for extended service life in demanding environments
• Quick installation and removal with external square drive design that provides excellent tool grip and torque transmission
• Reliable thread engagement with Class 2B thread fit ensuring consistent performance and vibration resistance
• Optimized for rapid assembly through coarse UNC threading that reduces cross-threading risks and speeds installation
• Precise dimensional compatibility with 1/4" width and 3/32" height for perfect fit in standard inch-system applications
• Environmental compliance assurance meeting both REACH and RoHS 3 standards for safe, regulated industrial use
• Right-hand thread direction providing standard, intuitive fastening operation familiar to maintenance teams

Professional Applications & Engineering Value

This 4-40 UNC square nut delivers exceptional engineering value through its brass material composition and precision manufacturing. The external square drive style enables secure wrench engagement, preventing slippage during high-torque applications while the coarse thread spacing ensures rapid installation in production environments. The Class 2B thread fit provides optimal clearance for reliable performance in vibration-prone assemblies, making it ideal for electrical enclosures, machinery components, and instrumentation panels. The right-hand thread direction follows industry standards for maintenance efficiency, while the corrosion-resistant brass construction maintains integrity in humid or chemically exposed settings without galling or seizing.

Specification Summary & Compliance

This square nut features precision 4-40 UNC coarse threading with Class 2B thread fit per ASME B1.1 standards, ensuring dimensional accuracy and interchangeability. The component measures 1/4" width and 3/32" height within inch-system tolerances. Manufacturing complies with REACH (EC 1907/2006) regulations (223 SVHC as of 01/17/2022) and RoHS 3 (2015/863/EU) with exemption 6(a)-I for lead as an alloying element in brass, confirming environmental responsibility and regulatory adherence for industrial distribution.