S-92778A040 4-40 x 1/8" ASME B18.3 Set Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 Stainless Steel construction, ideal for harsh environments and long-term reliability.
• Exceptional holding power provided by Class 3A thread fit, ensuring tight, secure fastening in precision assemblies.
• Easy installation and removal with a hex drive (0.050"), allowing for efficient tool engagement in confined spaces.
• Minimized surface damage thanks to the oval tip design, which distributes pressure evenly and protects components.
• High mechanical strength with Rockwell B80 hardness, offering durability under load and vibration.
• Reliable coarse threading (UNC) for quick assembly and reduced cross-threading risks in industrial applications.
• Compact and versatile headless design with 1/8" length, perfect for space-constrained applications requiring flush mounting.

Professional Applications & Engineering Value

This 4-40 UNC Class 3A set screw is engineered to address common industrial challenges such as component slippage and corrosion-induced failure. Crafted from 18-8 Stainless Steel, it provides excellent resistance to rust and oxidation, making it suitable for machinery, electronics, and outdoor equipment. The hex drive and headless design allow for secure fastening in tight spaces, while the oval tip ensures minimal marring on contact surfaces. With a coarse thread and precise Class 3A fit, it delivers reliable performance in high-vibration environments, reducing maintenance needs and enhancing assembly integrity for OEMs and MRO professionals.

Specification Summary & Compliance

This set screw adheres to ASME B18.3 specifications, ensuring dimensional accuracy and interchangeability. It features a UNC coarse thread with Class 3A tolerance for superior fit. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, guaranteeing environmental safety and material sustainability in industrial use.