S-94105A325 4-40 x 1/2" ASME B18.3, ASTM F912 Set Screws

Key Features & Benefits at a Glance

• Superior Vibration Resistance – The Class 3A thread fit ensures tighter tolerances and minimal backlash, maintaining secure positioning in high-stress assemblies.
• Exceptional Durability & Corrosion Protection – Black-Oxide Alloy Steel with a Rockwell C45 hardness offers excellent wear resistance and protection against rust in demanding environments.
• Optimized for High-Torque Applications – The hex drive (0.050") and headless design allow for easy installation with standard tools, even in confined spaces.
• Reliable Fastening with Flat Tip – The flat tip provides a broad contact surface, reducing component damage and ensuring stable, non-slip clamping.
• Broad Industry Compatibility – Coarse UNC threads (4-40) enable quick assembly and disassembly, ideal for machinery, automotive, and equipment manufacturing.
• Environmental & Regulatory Compliance – Meets RoHS 3 and REACH standards, ensuring safe use in global markets without hazardous substances.
• Precision Manufacturing Standards – Conforms to ASME B18.3 specifications, guaranteeing consistent quality and interchangeability in professional applications.

Professional Applications & Engineering Value

This 4-40 UNC set screw is engineered to address common industrial challenges such as component slippage, vibration-induced loosening, and corrosion in harsh operating conditions. The Black-Oxide Alloy Steel construction, combined with Rockwell C45 hardness, ensures long-term reliability in mechanical assemblies, automotive systems, and precision instruments. Its headless hex drive and flat tip design facilitate secure fastening without protruding parts, making it ideal for compact spaces where clearance is limited. By utilizing coarse UNC threads and Class 3A fit, this screw delivers consistent clamping force and ease of maintenance, reducing downtime in production environments.

Specification Summary & Compliance

This set screw features a 1/2" length with 4-40 UNC coarse threads and a Class 3A thread fit for precise engagement. It complies with ASME B18.3 manufacturing standards and is certified RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliant, meeting environmental and safety regulations for industrial use.