S-90291A106 4-40 ASME B18.3 Set Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction, ideal for harsh industrial environments and extended service life.
• Precise, vibration-resistant locking thanks to the Class 3A thread fit and nylon 6/6 tip, preventing loosening under dynamic loads.
• Easy installation in confined spaces with the headless design and .050" hex drive, allowing for flush mounting and tool accessibility.
• Durable, non-marring tip protection from the green nylon tip, which withstands temperatures from -50° to 250°F without damaging components.
• High mechanical strength with Rockwell B80 hardness, ensuring reliable performance under stress without deformation.
• Broad compatibility and secure fastening with 4-40 UNC coarse threads, providing strong holding power in various materials.
• Compliance with industry standards including ASME B18.3, RoHS 3, and REACH, ensuring safety and environmental responsibility.

Professional Applications & Engineering Value

This 4-40 UNC set screw is engineered to address common challenges in precision assembly, such as component slippage and corrosion in demanding settings. The 18-8 stainless steel material offers excellent resistance to rust and chemicals, making it suitable for applications in machinery, electronics, and automotive systems where exposure to moisture or contaminants is a concern. The nylon 6/6 plastic tip provides a soft, non-abrasive contact surface, preventing damage to shafts or gears while maintaining a firm grip under vibration. With its hex drive and headless design, it allows for easy installation in tight spaces, reducing assembly time and improving reliability in industrial set screws applications. This combination of features ensures long-term performance, minimizing maintenance needs and enhancing operational efficiency.

Specification Summary & Compliance

This set screw features a 4-40 UNC coarse thread with Class 3A thread fit for precise tolerances and secure fastening. It adheres to ASME B18.3 manufacturing standards, ensuring consistent quality and dimensional accuracy. Additionally, it is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its safety for use in various industrial environments without harmful substances.