S-92311A124 5-40 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.
• Maximum torque transmission and minimal slippage thanks to the hex socket drive and 1/16" drive size for secure fastening.
• Excellent vibration resistance and secure seating provided by the cup point tip, which bites into the mating surface for a firm, non-slip hold.
• Precise, reliable thread engagement with a Class 3A thread fit, ensuring tighter tolerances for high-strength applications.
• High mechanical strength and durability from a Rockwell B80 hardness, resisting wear and deformation under load.
• Space-saving headless design allows for flush mounting in applications where protruding fastener heads are not feasible.
• Broad industrial compatibility with coarse UNC threads (5-40) for quick assembly and disassembly in various machinery.

Professional Applications & Engineering Value

This 5-40 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 use in demanding environments like food processing, marine, and outdoor equipment. The hex socket drive and cup point design work in tandem to deliver superior clamping force and prevent loosening under high vibration, a common failure point in industrial machinery. Its headless and right-hand thread configuration ensures a clean, flush fit in collars, shafts, and pulleys, maintaining the integrity of rotating components. By combining a Class 3A thread fit with coarse threading, this screw offers fast installation and reliable performance in high-stress applications, reducing maintenance downtime and enhancing operational safety.

Specification Summary & Compliance

This set screw adheres to ASME B18.3 specifications, ensuring dimensional accuracy and manufacturing consistency. The UNC 5-40 thread features a Class 3A fit for precise, high-strength engagement. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming the absence of hazardous substances and supporting its use in environmentally conscious and global industrial supply chains.