S-91418A540 1/4"-20 x 1/2" ASTM F912 Set Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with black-oxide coating on alloy steel, extending service life in demanding industrial environments
• Enhanced torque transmission through square head design with external square drive, preventing tool slippage during installation
• Reliable thread engagement with UNC coarse threads and Class 2A fit, ensuring consistent fastening performance
• Precision extended tip design providing secure component positioning with controlled tip length and diameter tolerances
• Exceptional mechanical strength from Rockwell C45 hardness, maintaining structural integrity under high stress conditions
• Comprehensive regulatory compliance meeting ASTM F912, RoHS 3, and REACH standards for quality assurance
• Optimized for industrial applications with right-hand thread direction and coarse thread spacing for efficient assembly

Professional Applications & Engineering Value

This black-oxide alloy steel set screw delivers exceptional engineering value in industrial applications where vibration resistance and precise component positioning are critical. The extended tip design with controlled tolerances ensures accurate alignment in machinery, automotive, and manufacturing equipment, while the UNC coarse threads provide rapid installation and superior holding power. The square head configuration with external drive allows for high-torque application without cam-out, making it ideal for permanent assemblies requiring reliable set screw performance. The combination of Rockwell C45 hardness and corrosion-resistant black-oxide finish ensures long-term reliability in harsh operating conditions, solving common challenges of fastener failure and maintenance downtime.

Specification Summary & Compliance

This 1/4"-20 UNC set screw features Class 2A thread fit tolerance for precise engagement and is manufactured to ASTM F912 specifications. The extended tip maintains tight dimensional control with tip length tolerance of -0.005" to 0.005" and tip diameter tolerance of -0.007" to 0". The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and regulatory adherence for industrial applications worldwide.