S-90289A358 5/16"-24 x 1/4" ASME B18.3 Set Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with black-oxide coating, extending service life in demanding industrial environments
• Exceptional holding power from the cup point design that creates permanent seating and prevents component slippage
• Precision Class 3A thread fit ensures tight tolerances and reliable performance in high-vibration applications
• High-strength alloy steel construction with Rockwell C45 hardness provides excellent durability and wear resistance
• Space-saving headless design allows for flush mounting in confined spaces and rotating machinery
• Secure hex drive engagement with 5/32" drive size prevents cam-out and enables high torque application
• Regulatory compliance assurance meeting ASME B18.3, RoHS 3, and REACH standards for global industrial use

Professional Applications & Engineering Value

This black-oxide alloy steel set screw delivers critical engineering solutions where vibration resistance and permanent fastening are paramount. The UNF fine thread spacing combined with Class 3A precision threads creates superior clamping force in industrial machinery, automotive assemblies, and precision equipment. The cup point tip bites deeply into shaft materials, preventing rotational movement even under extreme dynamic loads. Engineered for corrosion-resistant performance, these headless screws with hex drive installation are ideal for permanent positioning applications where reliability cannot be compromised.

Specification Summary & Compliance

Manufactured to exacting ASME B18.3 specifications with Class 3A thread fit for superior dimensional accuracy. Features 5/16"-24 UNF fine threads with right-hand direction and Rockwell C45 hardness. Full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across global industrial markets.