S-90289A713 1/2"-13 x 1" ASME B18.3 Set Screws

Key Features & Benefits at a Glance

• Superior holding power with Class 3A thread fit for precise, secure fastening in demanding applications
• Enhanced corrosion resistance from the black-oxide finish, extending service life in industrial environments
• High-strength durability provided by alloy steel construction with Rockwell C45 hardness
• Secure anti-rotation locking through serrations that prevent loosening under vibration and dynamic loads
• Easy installation and removal with 1/4" hex drive, allowing for high torque application in confined spaces
• Effective surface penetration from the cup tip design that digs into shafts for permanent positioning
• Reliable coarse threading with UNC 1/2"-13 specification for quick assembly and strong engagement

Professional Applications & Engineering Value

This black-oxide alloy steel set screw delivers exceptional performance in industrial applications where vibration resistance and permanent positioning are critical. The combination of Rockwell C45 hardness and Class 3A thread fit ensures precise tolerances and reliable clamping force for machinery components, pulleys, and gears. The headless design with hex drive enables flush mounting in space-constrained assemblies, while the cup tip creates positive engagement with shaft materials. Serrations locking mechanism provides additional security against rotational movement, making these UNC threaded set screws ideal for high-torque applications in manufacturing equipment, automotive systems, and heavy machinery where maximum holding power is essential.

Specification Summary & Compliance

Manufactured to ASME B18.3 specifications with UNC 1/2"-13 coarse threads and Class 3A thread fit for superior dimensional accuracy. The 1" length and 0.5" thread diameter provide consistent performance across applications. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use in various industrial sectors.