S-94105A355 1/4"-28 x 5/16" ASME B18.3, ASTM F912 Set Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with black-oxide coating, extending service life in demanding industrial environments
• Precise thread engagement with Class 3A fit ensuring vibration-resistant fastening in critical assemblies
• High-strength performance from alloy steel construction with Rockwell C45 hardness for reliable load-bearing capacity
• Secure installation via 1/8" hex drive in headless design, ideal for confined spaces and flush mounting applications
• Optimized fine threading (1/4"-28 UNF) providing enhanced adjustment precision and superior holding power
• Regulatory compliance meeting ASME B18.3 specifications for guaranteed dimensional accuracy and interchangeability
• Environmental responsibility through RoHS 3 and REACH compliance, ensuring workplace safety and material sustainability

Professional Applications & Engineering Value

This black-oxide alloy steel set screw delivers exceptional engineering value in precision assembly applications where space constraints and vibration resistance are critical concerns. The headless design with 1/8" hex drive enables flush mounting in tight configurations while maintaining secure torque transmission. The Class 3A UNF fine threads provide superior clamping force distribution, effectively preventing loosening under dynamic loads in machinery, automotive components, and precision equipment. The combination of Rockwell C45 hardness and corrosion-resistant black-oxide treatment ensures long-term reliability in industrial environments, making these set screws ideal for permanent positioning of gears, pulleys, and collars on shafts where disassembly is infrequent but precision is paramount.

Specification Summary & Compliance

Manufactured to ASME B18.3 specifications with Class 3A thread fit for precision UNF threading (1/4"-28). Features include right-hand thread direction, flat tip configuration, and 5/16" length. Full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring restricted substance adherence. The alloy steel construction meets ASTM F912 standards for consistent performance in industrial fastening applications.