S-92785A506 4-40 x 5/8" ASME B18.3 Set Screws

Key Features & Benefits at a Glance

• Exceptional corrosion resistance with 18-8 stainless steel construction, ideal for harsh industrial environments and extended service life
• Superior vibration resistance and holding power from the Class 3A thread fit, ensuring a secure, reliable connection in high-stress applications
• Optimized for high-torque installation with the hex drive design, preventing tool slippage and simplifying assembly
• Enhanced grip and component positioning provided by the 90° cone point, which bites into the shaft for superior resistance to rotational forces
• Robust mechanical strength with a Rockwell B80 hardness, offering excellent durability and resistance to wear and deformation
• Broad compatibility and easy sourcing due to compliance with the widely recognized ASME B18.3 standard
• Safe for regulated industries as it is fully compliant with RoHS 3 and REACH environmental regulations

Professional Applications & Engineering Value

This 4-40 UNC set screw is engineered to solve critical challenges in precision assembly and motion control systems. The 18-8 stainless steel material provides excellent resistance to rust and corrosion, making it suitable for applications in manufacturing, automotive, and electronics where environmental factors are a concern. The headless design with a hex drive allows for flush mounting in confined spaces, while the coarse UNC threads and Class 3A fit ensure rapid assembly and a tight, secure fit that resists loosening under vibration. The 90° cone point is specifically designed to create a permanent dimple in a shaft, providing maximum resistance to rotational forces and preventing component slippage in pulleys, gears, and collars. This combination of features delivers reliable performance in demanding industrial set screw applications, reducing maintenance needs and improving overall system integrity.

Specification Summary & Compliance

This set screw features a 4-40 UNC thread with a Class 3A fit for precise dimensional accuracy and a secure fit. It is manufactured in accordance with the ASME B18.3 standard, ensuring consistent quality and interchangeability. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming it is free of hazardous substances and safe for use in various markets.