S-99934A220 4-40 x 1/4" 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 and precision fit due to Class 3A thread tolerance, minimizing backlash and ensuring secure, vibration-resistant connections.
• High-strength durability with Rockwell B80 hardness, providing excellent resistance to wear and deformation under load.
• Secure, non-marring fastening thanks to the silver soft tip, which protects mating surfaces from damage during installation and use.
• Easy installation and high torque capability with the 0.050" hex drive, allowing for efficient assembly with standard tools.
• Reliable performance in coarse-thread applications using 4-40 UNC right-hand threads, designed for quick assembly and strong holding in a variety of materials.
• Compact, headless design that saves space and provides a flush finish, perfect for applications where protrusion is not acceptable.

Professional Applications & Engineering Value

This 4-40 UNC set screw is engineered to address common industrial challenges such as component slippage, vibration loosening, and corrosion. The 18-8 Stainless Steel material offers excellent resistance to rust and oxidation, making it suitable for demanding environments like machinery, automotive assemblies, and outdoor equipment. The Class 3A thread fit ensures tight tolerances and reliable engagement, reducing the risk of failure in high-stress applications. Combined with a hex drive for easy installation and a soft tip to prevent surface damage, this set screw provides a dependable solution for securing collars, pulleys, and gears without compromising the integrity of the components. Its compliance with industry standards ensures consistent quality and performance in precision engineering tasks.

Specification Summary & Compliance

This set screw features a 4-40 UNC coarse thread with Class 3A fit for precise dimensional accuracy, a length of 1/4", and a hex drive size of 0.050". It is manufactured in accordance with ASME B18.3 specifications and is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and adherence to global standards for industrial fasteners.