S-90251A619 3/8"-16 x 1/2" ASME B18.3 Set Screws

Key Features & Benefits at a Glance

• Permanent vibration resistance with nylon patch thread locker that maintains secure locking even under dynamic loads
• Superior corrosion protection through 18-8 stainless steel construction for extended service life in harsh environments
• Precise thread engagement with Class 3A fit ensuring reliable fastening and reduced installation torque variability
• High-temperature performance with locking capability maintained across extreme conditions (-50° to 250°F)
• Optimized drive efficiency through 3/16" hex drive design providing maximum torque transmission
• Enhanced material hardness with Rockwell B80 rating delivering excellent wear resistance and durability
• Secure component positioning via cup tip design that creates positive engagement with mating surfaces

Professional Applications & Engineering Value

This 3/8"-16 UNC hex headless set screw delivers critical engineering solutions for permanent assembly applications where vibration resistance and positional security are paramount. The nylon patch thread locking technology eliminates the need for secondary locking components while providing consistent clamping force across temperature extremes from -50° to 250°F. Manufactured from 18-8 stainless steel, this fastener offers exceptional corrosion resistance for demanding environments including marine, chemical processing, and outdoor equipment. The Class 3A thread fit ensures precise installation with minimal tolerance stack-up, while the cup tip design provides concentrated contact pressure for secure component positioning in shafts, collars, and gears. This combination of features makes it ideal for permanent assemblies in machinery, automotive systems, and industrial equipment where disassembly is not anticipated.

Specification Summary & Compliance

This set screw features 3/8"-16 UNC coarse threads with Class 3A thread fit for precision engagement, manufactured to ASME B18.3 specifications. The fastener maintains Rockwell B80 hardness and incorporates a nylon patch thread locker on right-hand threads. Compliance includes RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring suitability for global industrial applications.