S-92991A211 4-40 x 3/8" ASME B18.3 Set Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with brass material, ideal for harsh or moisture-prone environments without compromising integrity.
• Precise, secure fastening ensured by Class 3A thread fit, minimizing backlash and enhancing joint reliability in assemblies.
• Easy installation and removal with 0.050" hex drive, providing excellent torque transmission and reducing tool slippage.
• Enhanced grip and alignment from the cup tip design, preventing component movement and distributing pressure evenly.
• Consistent performance with Rockwell B55 hardness, offering balanced strength and durability for repeated use.
• Broad compatibility through 4-40 UNC coarse threads, facilitating quick assembly in various industrial applications.
• Compliance with global standards including ASME B18.3, RoHS 3, and REACH, ensuring safety and environmental responsibility.

Professional Applications & Engineering Value

This 4-40 UNC brass set screw is engineered to address common industrial challenges such as vibration loosening and corrosion in precision equipment. The headless design with a cup tip provides firm seating, preventing axial displacement in machinery parts like gears, pulleys, and collars. Made from durable brass material, it resists rust and galvanic corrosion, making it suitable for electrical enclosures, marine components, and automotive systems where moisture exposure is a concern. The Class 3A thread fit and coarse threads ensure quick, reliable fastening, reducing assembly time while maintaining high torque resistance. Its hex drive allows for efficient installation in confined spaces, supporting maintenance efficiency and long-term operational stability in demanding environments.

Specification Summary & Compliance

This set screw adheres to ASME B18.3 specifications, with precise Class 3A thread fit for tight tolerances and consistent performance. It meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, ensuring it is free from hazardous substances and environmentally safe. The product features a 4-40 UNC coarse thread with right-hand direction, 3/8" length, and Rockwell B55 hardness, providing reliable mechanical properties for industrial fastening applications.