S-90289A338 10-32 x 1/4" ASME B18.3 Set Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with Black-Oxide finish, extending service life in harsh industrial environments.
• Exceptional holding power due to serrations locking, preventing loosening under vibration and dynamic loads.
• High-strength durability from Rockwell C45 hardened alloy steel, ensuring reliable performance in demanding applications.
• Precise, secure fastening with Class 3A thread fit, offering tighter tolerances for reduced backlash and improved alignment.
• Easy installation and removal using a standard 3/32" hex key, saving time and labor in assembly and maintenance.
• Effective surface grip with cup tip design, distributing pressure evenly to minimize damage to mating components.
• Broad regulatory compliance including RoHS 3 and REACH, ensuring safe, environmentally responsible use in global markets.

Professional Applications & Engineering Value

This 10-32 UNF Class 3A set screw is engineered to address critical challenges in precision assembly and machinery. The Black-Oxide Alloy Steel construction provides enhanced corrosion resistance, ideal for components exposed to moisture or chemicals, while the Rockwell C45 hardness ensures it withstands high stress without deformation. The headless design with hex drive allows for flush mounting in confined spaces, and the serrations locking mechanism offers vibration-resistant security, preventing unintended loosening in motors, gears, and rotating equipment. With fine thread spacing and Class 3A thread fit, it delivers superior clamping force and alignment accuracy, making it a reliable choice for aerospace, automotive, and industrial machinery where precision and durability are paramount.

Specification Summary & Compliance

This set screw adheres to ASME B18.3 standards, ensuring dimensional accuracy and interchangeability. The UNF fine thread with Class 3A fit provides precise thread engagement, while the 1/4" length and 0.19" thread diameter meet specified inch system requirements. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its suitability for use in environmentally conscious and restricted substance-controlled applications.