S-92991A105 4-40 x 3/16" ASME B18.3 Set Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with brass material, ideal for harsh environments and reducing maintenance costs.
• Precise Class 3A thread fit ensures tight, reliable fastening with minimal backlash in critical assemblies.
• High Rockwell B55 hardness provides excellent wear resistance and durability under repeated use.
• Compact headless design with hex drive allows for easy installation in confined spaces using standard 0.050" hex tools.
• Cup tip design offers secure gripping on shafts and components, preventing slippage and ensuring positional accuracy.
• Compliance with ASME B18.3, RoHS, and REACH guarantees quality, safety, and environmental standards for global industrial use.
• Coarse UNC threads enable quick assembly and disassembly, saving time in production and maintenance cycles.

Professional Applications & Engineering Value

This 4-40 UNC set screw in brass is engineered to address common industrial challenges such as corrosion, vibration loosening, and space constraints. The Class 3A fit and coarse thread spacing deliver high clamping force and stability, making it ideal for precision machinery, electronic enclosures, and automotive components where reliable set screw performance is critical. Its headless design and hex drive facilitate seamless integration in tight assemblies, while the cup tip ensures firm contact on rotating parts, reducing the risk of damage. By combining Rockwell B55 hardness with right-hand thread efficiency, this fastener extends service life and minimizes downtime in demanding applications.

Specification Summary & Compliance

This set screw features a 0.112" thread diameter and 3/16" length with UNC coarse threads and Class 3A fit for precise dimensional accuracy. It meets ASME B18.3 manufacturing specifications and is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and industry-standard reliability.