S-90289A350 1/4"-28 x 3/16" ASME B18.3 Set Screws

Key Features & Benefits at a Glance

• Enhanced corrosion resistance with black-oxide coating, extending service life in harsh industrial environments.
• Superior holding power from the cup tip design, ensuring secure fastening and reduced loosening under vibration.
• High-strength durability with Rockwell C45 hardness, providing reliable performance in demanding applications.
• Precise thread engagement with Class 3A fine UNF threads, offering tight tolerances for accurate assembly.
• Easy installation and removal using the 1/8" hex drive, allowing for efficient maintenance with standard tools.
• Secure anti-rotation locking through serrations, preventing unintended movement in dynamic setups.
• Compliance with industry standards including ASME B18.3, ensuring consistent quality and interoperability.

Professional Applications & Engineering Value

This 1/4"-28 UNF Class 3A set screw is engineered from black-oxide alloy steel to address critical challenges in industrial settings, such as component slippage and corrosion-induced failures. The fine thread spacing and cup tip design maximize grip on shafts and collars, making it ideal for precision machinery, automotive assemblies, and aerospace components where vibration resistance is paramount. Its headless hex drive allows for flush mounting in confined spaces, while the Rockwell C45 hardness ensures long-term reliability under high stress. By incorporating serrations for locking, it reduces the need for additional fasteners, streamlining installation in industrial set screw applications and enhancing overall engineering efficiency.

Specification Summary & Compliance

This set screw adheres to Class 3A thread fit for precise UNF threading with a diameter of 0.25" and fine spacing. It meets ASME B18.3 manufacturing specifications and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material integrity for global industrial use.