S-90289A591 5/16"-18 x 2" ASME B18.3 Set Screws

Key Features & Benefits at a Glance

• Exceptional corrosion resistance with black-oxide coating, extending service life in harsh industrial environments
• Superior holding power from Class 3A thread fit ensuring precise, vibration-resistant fastening in critical assemblies
• High-strength durability with Rockwell C45 hardness alloy steel maintaining integrity under heavy loads
• Secure anti-rotation locking through serrations preventing unintended loosening in dynamic applications
• Optimized torque transmission via 5/32" hex drive design enabling efficient installation in confined spaces
• Reliable material engagement with cup tip design concentrating clamping force for permanent component positioning
• Industry-standard compatibility with UNC coarse threads ensuring interchangeability across equipment and machinery

Professional Applications & Engineering Value

Engineered for permanent component positioning in industrial machinery, this black-oxide alloy steel set screw addresses critical vibration-induced loosening challenges. The Class 3A UNC coarse thread delivers superior thread engagement in soft metals and plastics, while the cup tip creates concentrated clamping force for shaft collars, gears, and pulleys. The hex headless design allows flush mounting in space-constrained assemblies, with serrations providing secondary locking security. Ideal for automotive, manufacturing, and heavy equipment applications requiring vibration-resistant fastening solutions that maintain alignment under continuous operational stress.

Specification Summary & Compliance

Manufactured to ASME B18.3 specifications with Class 3A thread fit tolerance for precision assembly. Features 5/16"-18 UNC coarse threads with right-hand direction and 2" length. Full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. Material certification includes Rockwell C45 hardness alloy steel with black-oxide surface treatment for corrosion protection.