S-90291A848 4-40 ASME B18.3 Set Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction for long-lasting performance in harsh environments
• Exceptional holding power ensured by Class 3A thread fit precision, preventing loosening under vibration
• Non-marring surface protection from the green nylon 6/6 tip, preventing damage to delicate components
• Reliable temperature performance with nylon tip rated for -50° to 250°F, maintaining integrity in extreme conditions
• Secure installation through .050" hex drive design, providing positive torque control in confined spaces
• Industry-standard compliance with ASME B18.3 specifications, ensuring interchangeability and reliability
• Environmental responsibility through RoHS 3 and REACH compliance, meeting modern regulatory requirements

Professional Applications & Engineering Value

This 4-40 UNC hex headless set screw delivers critical engineering solutions for precision assembly applications where component protection and vibration resistance are paramount. The 18-8 stainless steel construction provides excellent corrosion resistance, making it ideal for harsh environments including marine, chemical processing, and outdoor equipment. The Class 3A thread fit ensures superior clamping force and resistance to vibrational loosening in machinery, robotics, and automotive assemblies. The nylon 6/6 plastic tip offers non-marring contact with delicate surfaces while maintaining sealing properties across a wide temperature range from -50° to 250°F. The coarse UNC thread design facilitates quick installation and removal, while the headless configuration allows for flush mounting in space-constrained applications.

Specification Summary & Compliance

This precision set screw features 4-40 UNC coarse threads with Class 3A thread fit for superior dimensional accuracy and holding power. Manufactured to ASME B18.3 specifications, the component ensures industry-standard compatibility and performance. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, confirming its suitability for modern manufacturing requirements. Additional specifications include right-hand thread direction, 5/16" length, and Rockwell B80 hardness for optimal mechanical performance.