S-90289A537 1/4"-20 x 1/2" ASME B18.3 Set Screws

Key Features & Benefits at a Glance

• Enhanced corrosion resistance with black-oxide coating, extending service life in demanding industrial environments
• Superior holding power from serrated locking design, preventing loosening under vibration and dynamic loads
• High-strength performance with Rockwell C45 hardness alloy steel, ensuring reliable fastening in heavy-duty applications
• Precise thread engagement with Class 3A UNC coarse threads, enabling quick installation and reduced cross-threading risks
• Space-saving headless design with hex drive, allowing flush mounting where clearance is limited
• Secure cup tip contact that bites into shafts and components, providing excellent anti-rotation characteristics
• Industry compliance assurance meeting ASME B18.3, RoHS 3, and REACH standards for quality and environmental safety

Professional Applications & Engineering Value

This black-oxide alloy steel set screw delivers exceptional engineering value for industrial applications requiring reliable shaft and component positioning. The Class 3A UNC coarse thread configuration ensures rapid installation while maintaining precise tolerances, significantly reducing assembly time in production environments. The serrated locking mechanism combined with the cup tip design creates multiple biting points that effectively resist rotational forces and vibration-induced loosening in machinery, automotive components, and power transmission systems. Manufactured from Rockwell C45 hardened alloy steel, this hex headless set screw maintains its structural integrity under high torque applications while the black-oxide surface treatment provides additional corrosion protection in challenging operating conditions, making it ideal for permanent fastening solutions where disassembly is infrequent.

Specification Summary & Compliance

This set screw features precision Class 3A thread fit with 1/4"-20 UNC coarse threads and right-hand thread direction, manufactured to exacting dimensional standards. The product complies with ASME B18.3 specifications for set screws and meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring both mechanical performance and regulatory compliance for industrial applications worldwide.