S-95289A033 1/4"-20 x 3/8" ASME B18.3 Set Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction for reliable performance in harsh industrial environments
• Exceptional holding power achieved through Class 3A thread fit precision, ensuring secure fastening in demanding applications
• Enhanced torque transmission via 1/8" hex drive design, preventing tool slippage and enabling efficient installation
• Optimized material hardness at Rockwell B80 provides excellent durability while maintaining necessary ductility
• Extended tip design with precise diameter control creates deeper engagement and superior resistance to vibration loosening
• Industry-standard compliance with ASME B18.3 specifications guarantees consistent quality and interchangeability
• Environmental responsibility through RoHS 3 and REACH compliance, meeting modern regulatory requirements

Professional Applications & Engineering Value

This 1/4-20 UNC set screw delivers exceptional engineering value in precision assembly applications where vibration resistance and reliable positioning are critical. The 18-8 stainless steel construction provides excellent corrosion resistance for machinery operating in demanding environments, while the Class 3A thread fit ensures precise engagement with mating components. The hex headless design with 1/8" drive offers space-saving installation in confined areas, and the extended tip with controlled dimensions creates positive seating in shafts, collars, and pulleys. These industrial set screws are engineered to prevent loosening under dynamic loads, making them ideal for power transmission systems, precision equipment, and manufacturing machinery where coarse thread fasteners are specified for rapid assembly and disassembly.

Specification Summary & Compliance

This precision fastener features 1/4"-20 UNC coarse threads with Class 3A thread fit for superior dimensional accuracy. The extended tip maintains tight tolerances with tip diameter of 0.156" (-0.007" to 0) and tip length of 0.134" (-0.005" to 0). Manufactured in compliance with ASME B18.3 standards and certified RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, ensuring both mechanical performance and environmental responsibility.