S-90289A764 1/2"-20 x 1 1/2" ASME B18.3 Set Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with black-oxide coating, extending service life in harsh industrial environments
• Exceptional thread precision with Class 3A fit ensuring reliable, vibration-resistant fastening in critical assemblies
• High-strength performance from Rockwell C45 hardened alloy steel, preventing deformation under heavy loads
• Secure locking capability through serrations that resist loosening in high-vibration applications
• Optimized torque transmission with 1/4" hex drive design for easy installation and removal with standard tools
• Precise component positioning using the cup tip design that creates consistent contact points on shafts and collars
• Regulatory compliance assurance meeting ASME B18.3 standards and environmental regulations for global industrial use

Professional Applications & Engineering Value

This black-oxide alloy steel set screw delivers exceptional engineering value in demanding industrial applications where precision and reliability are paramount. The 1/2"-20 UNF fine threading with Class 3A fit provides superior engagement in precision machinery, preventing backlash in gear assemblies, pulley systems, and coupling connections. The headless design with serrations locking ensures flush mounting while resisting rotational forces in high-vibration environments. The Rockwell C45 hardness maintains dimensional stability under repetitive stress, making it ideal for permanent positioning applications in automotive, aerospace, and heavy equipment manufacturing. The combination of corrosion-resistant black-oxide treatment and precise cup tip configuration solves common challenges of component slippage and environmental degradation in industrial settings.

Specification Summary & Compliance

This set screw features 1/2"-20 UNF fine threads with Class 3A precision tolerance for exacting fit requirements. Manufacturing complies with ASME B18.3 specifications for dimensional accuracy and performance. The product is certified RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting international environmental regulations for hazardous substance restrictions. The inch system measurement ensures compatibility with North American industrial standards and tooling systems.