S-94105A104 4-40 x 1/8" ASME B18.3, ASTM F912 Set Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with black-oxide coating that protects against rust in demanding industrial environments
• Exceptional holding power achieved through Class 3A thread fit precision, ensuring secure fastening in critical applications
• High-strength performance backed by Rockwell C45 hardness rating, providing reliable durability under mechanical stress
• Space-saving headless design allows for flush mounting where clearance is limited, ideal for compact assemblies
• Easy installation and removal with hex drive configuration that prevents cam-out and enables high torque application
• Wide compatibility with UNC coarse threading that resists loosening in vibrating machinery and equipment
• Regulatory compliance assurance meeting international standards for environmental safety and quality control

Professional Applications & Engineering Value

This 4-40 UNC set screw delivers exceptional engineering value in precision assemblies where space constraints and vibration resistance are critical concerns. The black-oxide alloy steel construction provides superior corrosion protection while maintaining the Rockwell C45 hardness needed for repeated adjustments without thread deformation. The headless hex drive design with 0.050" drive size enables secure installation in confined spaces, while the Class 3A thread fit ensures precise engagement with mating components. These industrial set screws are particularly valuable in machinery, automotive, and electronic applications where coarse thread spacing prevents loosening under vibration and the flat tip provides maximum contact surface for secure positioning of collars, gears, and pulleys.

Specification Summary & Compliance

This set screw features precision 4-40 UNC threads with Class 3A fit for superior dimensional accuracy and consistent performance. Manufactured in compliance with ASME B18.3 specifications where ASTM F912 applies, ensuring standardized quality and interchangeability. The product meets RoHS 3 (2015/863/EU) compliance for restricted substances and REACH (EC 1907/2006) regulations current as of January 17, 2023, confirming environmental responsibility and workplace safety standards.