S-95289A314 1/4"-20 x 1/4" ASME B18.3, ASTM F912 Set Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with black oxide coating for extended service life in demanding industrial environments
• Maximum thread engagement reliability with Class 3A fit ensuring precise, vibration-resistant fastening in critical applications
• Exceptional mechanical strength from alloy steel construction with Rockwell C45 hardness for heavy-duty load bearing
• Enhanced installation efficiency through 1/8" hex drive design providing secure tool engagement without head protrusion
• Optimized component positioning with extended tip configuration (0.134" length) for positive location and secure shaft retention
• Reliable coarse thread performance with 1/4"-20 UNC threads resisting loosening under vibration and dynamic loads
• Full regulatory compliance meeting ASME B18.3 standards while being RoHS 3 and REACH compliant for global applications

Professional Applications & Engineering Value

This black oxide alloy steel set screw delivers critical engineering solutions for industrial machinery, automotive components, and precision equipment where vibration resistance and secure positioning are paramount. The Class 3A thread fit ensures exceptional dimensional accuracy for zero-backlash assemblies, while the extended tip configuration provides positive indexing on shafts and collars. The headless design with hex drive allows for flush mounting in space-constrained applications, and the coarse UNC threads maintain holding power under severe dynamic loading conditions. Manufactured from high-strength alloy steel with Rockwell C45 hardness, this set screw withstands repeated adjustment cycles without thread deformation, making it ideal for permanent installations requiring reliable, maintenance-free performance.

Specification Summary & Compliance

This precision set screw features 1/4"-20 UNC Class 3A coarse threads with tight tolerance control for superior fit. The extended tip maintains precise dimensions with tip length of 0.134" (-0.005" to 0" tolerance) and tip diameter of 0.156" (-0.007" to 0" tolerance). Manufactured in compliance with ASME B18.3 standards and meeting ASTM F912 specifications, the component demonstrates full conformity with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across global industrial markets.