S-92311A271 4-40 x 7/8" ASME B18.3 Set Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction for long-lasting performance in harsh environments
• Maximum holding power through the cup point design that bites into shafts and components securely
• Precise thread engagement with Class 3A fit ensuring tight tolerances and reliable fastening
• High durability backed by Rockwell B80 hardness for excellent wear resistance and mechanical strength
• Easy installation and removal using the 0.050" hex drive, ideal for confined spaces with headless design
• Wide compatibility with coarse UNC threads (4-40) and right-hand direction for standard industrial applications
• Regulatory compliance meeting ASME B18.3, RoHS 3, and REACH standards for safe, quality-assured use

Professional Applications & Engineering Value

This 4-40 UNC set screw is engineered to address critical challenges in precision assembly and machinery. The 18-8 stainless steel material provides excellent resistance to rust and oxidation, making it ideal for applications in humid or corrosive settings like marine equipment, food processing machinery, and outdoor industrial systems. The hex headless and cup point design ensures a flush finish while generating strong frictional grip on shafts, pulleys, and gears, preventing slippage under high torque or vibration. With a coarse thread and Class 3A thread fit, it offers quick installation and reliable alignment in automation, automotive, and aerospace components, reducing maintenance needs and enhancing operational safety.

Specification Summary & Compliance

This set screw adheres to ASME B18.3 specifications, with precise Class 3A thread fit for consistent dimensional accuracy. Thread details include 4-40 UNC coarse thread, right-hand direction, and 7/8" length. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and restricted substance control.