S-90291A405 5/16"-24 ASME B18.3 Set Screws

Key Features & Benefits at a Glance

• Superior vibration resistance with a durable green nylon 6/6 tip that prevents loosening under dynamic loads
• Excellent corrosion resistance thanks to 18-8 stainless steel construction, ideal for harsh environments
• Precise thread engagement with Class 3A UNF fine threads ensuring reliable, secure fastening
• Easy installation and removal via the 5/32" hex drive, providing high torque capability without head protrusion
• Broad temperature compatibility with nylon tip rated from -50° to 250°F for versatile industrial use
• Enhanced surface protection as the soft nylon tip prevents damage to shafts and components
• Consistent mechanical performance supported by Rockwell B80 hardness for repeated use without deformation

Professional Applications & Engineering Value

This 5/16"-24 UNF Class 3A nylon tip set screw is engineered to address critical challenges in precision assemblies, such as shaft collars, gears, and pulleys, where vibration-induced loosening can lead to equipment failure. The 18-8 stainless steel body offers reliable corrosion resistance in moist or chemical-exposed settings, while the fine UNF threads and Class 3A fit ensure tight tolerances for minimal backlash. The green nylon 6/6 tip acts as a self-locking element, maintaining clamp force without marring surfaces, making it ideal for adjustable positioning in machinery, automotive, and electronics. Its headless, hex drive design allows flush mounting in confined spaces, streamlining maintenance and improving safety in high-performance industrial applications.

Specification Summary & Compliance

This set screw features a 5/16"-24 UNF fine thread with Class 3A thread fit for high precision, a thread diameter of 0.313", and a length of 3/8". It is manufactured in accordance with ASME B18.3 specifications and is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and reliability for global supply chains.