S-90291A878 1/2"-20 ASME B18.3 Set Screws

Key Features & Benefits at a Glance

• Secure anti-loosening performance with durable green nylon tip that maintains grip under vibration and prevents damage to mating surfaces
• Superior corrosion resistance through 18-8 stainless steel construction for long-term reliability in harsh environments
• Precision thread engagement with Class 3A fit ensuring tight tolerances and reliable fastening in critical applications
• High-strength durability with Rockwell B80 hardness providing excellent mechanical properties and wear resistance
• Wide temperature compatibility with nylon tip performing reliably from -50° to 250°F (-45° to 121°C)
• Easy installation and removal with 1/4" hex drive design allowing high torque application in confined spaces
• Industry-standard compliance meeting ASME B18.3 specifications for consistent quality and interchangeability

Professional Applications & Engineering Value

This 18-8 stainless steel set screw with green nylon tip delivers exceptional engineering value in applications requiring secure positioning without surface damage. The UNF fine thread spacing and Class 3A thread fit provide precise adjustment capabilities in machinery, automotive components, and precision instruments where vibration resistance is critical. The hex headless design with 1/4" drive enables flush mounting in confined spaces while maintaining high torque capacity. The corrosion-resistant stainless steel body combined with the nylon 6/6 plastic tip creates an ideal solution for permanent assemblies requiring protection against galling and marring of expensive components. These set screws are particularly valuable in manufacturing equipment, aerospace components, and medical devices where reliability and surface protection are paramount concerns.

Specification Summary & Compliance

This precision fastener features 1/2"-20 UNF fine threads with Class 3A thread fit for superior dimensional accuracy. Manufactured to ASME B18.3 standards ensuring consistent quality and performance. The product is fully RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting the latest environmental regulations for industrial fasteners. The right-hand thread direction and precise thread diameter of 0.5" provide reliable engagement in demanding applications.