S-93445A420 1/4"-20 x 1/4" ASME B18.3 Set Screws

Key Features & Benefits at a Glance

• Superior locking performance with serrated cup point design that bites into mating surfaces for maximum resistance to vibration and rotation
• Exceptional corrosion resistance provided by 18-8 stainless steel construction, ideal for harsh industrial environments
• Precise Class 3A thread fit ensures tight tolerances and reliable engagement for critical assembly applications
• Optimized mechanical strength with Rockwell B80 hardness rating that maintains integrity under heavy loads
• Space-saving headless design with 1/8" hex drive allows installation in confined spaces while providing secure tool engagement
• Reliable coarse UNC threading (1/4"-20) enables quick assembly and disassembly while maintaining holding power
• Full regulatory compliance with ASME B18.3 standards plus RoHS 3 and REACH environmental directives

Professional Applications & Engineering Value

This 1/4-20 UNC Class 3A hex headless set screw delivers critical engineering solutions for industrial applications requiring permanent, vibration-resistant fastening. The 18-8 stainless steel construction provides excellent corrosion resistance in demanding environments, while the serrated cup point design creates multiple biting edges that penetrate mating surfaces for superior anti-rotation performance. The coarse UNC thread profile ensures rapid installation and reliable engagement in various materials, making it ideal for machinery components, power transmission systems, and precision equipment where permanent locking is essential. With its headless configuration and compact hex drive, this set screw offers space-efficient fastening without compromising on installation torque or removal capability.

Specification Summary & Compliance

This precision fastener features 1/4"-20 UNC coarse threads with Class 3A fit for superior dimensional accuracy and thread engagement. Manufactured to ASME B18.3 specifications, the set screw maintains 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 industrial applications. Right-hand thread direction and standardized dimensions guarantee compatibility with existing assembly systems and tooling.