S-90289A577 5/16"-18 x 7/16" 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 Class 3A thread fit, ensuring vibration resistance and secure fastening in critical assemblies
• High-strength durability with Rockwell C45 hardness alloy steel, providing reliable performance under heavy loads
• Easy installation and removal via 5/32" hex drive, allowing efficient maintenance with standard tools
• Enhanced grip and anti-loosening through serrations locking mechanism, preventing unintended rotation in dynamic applications
• Optimized for coarse-thread applications with 5/16"-18 UNC threads, offering quick assembly and reduced cross-threading risks
• Space-saving headless design with cup tip, enabling flush mounting and concentrated clamping force

Professional Applications & Engineering Value

This black-oxide alloy steel set screw delivers critical engineering solutions where vibration resistance, corrosion protection, and precise clamping are paramount. The Class 3A thread fit and UNC coarse threads ensure tight tolerances and rapid installation in machinery, automotive components, and power transmission systems. Its headless design with serrations prevents slippage in high-torque scenarios, while the cup tip concentrates pressure to secure gears, pulleys, and collars without damaging surfaces. Ideal for OEM and MRO applications, this screw maintains integrity in harsh conditions, reducing maintenance frequency and downtime.

Specification Summary & Compliance

Manufactured to ASME B18.3 specifications with Class 3A thread fit for precise dimensional accuracy. Complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental standards, ensuring safe use in regulated industries. Thread specifications include 5/16"-18 UNC coarse threads, right-hand direction, and consistent Rockwell C45 hardness for uniform performance.