S-94105A311 4-40 x 3/8" 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
• Exceptional holding power provided by Class 3A thread fit ensuring precise, vibration-resistant fastening
• High-strength performance from Rockwell C45 hardened alloy steel that withstands heavy loads and stress
• Easy installation and removal with hex drive design requiring minimal clearance space in confined applications
• Secure positioning capability through flat tip design that creates reliable contact surfaces on shafts and components
• Industry-standard compatibility with UNC coarse threads for straightforward replacement and interchangeability
• Environmental compliance assurance meeting RoHS 3 and REACH regulations for safe, sustainable manufacturing

Professional Applications & Engineering Value

This 4-40 UNC set screw delivers critical engineering solutions for precision assembly challenges where space constraints and vibration resistance are paramount. The black-oxide alloy steel construction provides excellent corrosion protection while maintaining the Rockwell C45 hardness needed for repeated torque applications. The headless design with hex drive allows installation in confined spaces where traditional fasteners cannot fit, making it ideal for machinery, automotive components, and precision instruments. The Class 3A thread fit ensures minimal backlash and superior clamping force, while the flat tip creates maximum surface contact for secure positioning of gears, pulleys, and collars on shafts. These industrial set screws are engineered to prevent loosening under dynamic loads, reducing maintenance requirements and improving overall system reliability.

Specification Summary & Compliance

This set screw maintains precise Class 3A thread fit tolerances with UNC coarse threads (4-40 size) and 3/8" length. Manufacturing conforms to ASME B18.3 specifications where applicable per ASTM F912. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and regulatory adherence for industrial applications worldwide.