S-90251A617 3/8"-16 x 3/8" ASME B18.3 Set Screws

Key Features & Benefits at a Glance

• Vibration-resistant performance with permanent nylon patch thread locker that maintains secure fastening under dynamic loads
• Superior corrosion resistance through 18-8 stainless steel construction for extended service life in harsh environments
• Precision thread engagement with Class 3A thread fit ensuring reliable, high-strength connections in critical applications
• Wide temperature tolerance with thread locker effective from -50° to 250°F for thermal cycling applications
• Enhanced installation control through hex drive design allowing high torque application without head interference
• Optimized point contact with cup tip design providing superior grip and minimal surface damage to shafts
• Consistent mechanical properties with Rockwell B80 hardness balancing strength and ductility

Professional Applications & Engineering Value

This 3/8"-16 UNC hex headless set screw delivers exceptional engineering value in applications where vibration resistance and positional security are critical. The permanent nylon patch thread locker eliminates the need for secondary locking mechanisms while providing reliable fastening in rotating assemblies, machinery components, and precision equipment. Manufactured from 18-8 stainless steel, this set screw offers excellent corrosion resistance for outdoor, marine, and chemical processing environments. The cup tip design ensures maximum holding power with minimal surface marring, making it ideal for securing gears, pulleys, and collars on shafts. The Class 3A thread fit guarantees precise engagement and consistent clamping force in high-vibration industrial settings where loosening could cause equipment failure or safety hazards.

Specification Summary & Compliance

This set screw features 3/8"-16 UNC coarse threads with Class 3A thread fit for superior dimensional accuracy and engagement. Manufactured to ASME B18.3 specifications with Rockwell B80 hardness for consistent mechanical performance. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across global industrial markets. The nylon patch thread locker maintains effectiveness across the specified temperature range of -50° to 250°F without degradation.