S-94414A106 4-40 x 1/4" ASME B18.3, ASTM F835 Alloy Steel Torx Flat Head Screws

Key Features & Benefits at a Glance

• Superior torque transmission with Torx Plus IP10 drive, reducing cam-out and tool wear for reliable fastening in repetitive industrial applications.
• Exceptional strength and durability from alloy steel construction, providing 140,000 psi tensile strength and Rockwell C39 hardness to withstand high-stress conditions.
• Enhanced corrosion resistance with black-oxide coating, offering protection in various environments and extending the screw's service life.
• Precise, secure thread engagement with Class 3A UNC coarse threads, ensuring tight fits and reducing the risk of stripping in demanding assemblies.
• Flush, low-profile installation thanks to the standard 82° flat head and full threading, ideal for applications where a smooth surface is critical.
• Broad regulatory compliance including ASME B18.3, RoHS 3, and REACH, guaranteeing suitability for global industrial and electronic sectors.
• Optimized for high-volume use with right-hand threading and coarse spacing, enabling faster installation and improved efficiency in production lines.

Professional Applications & Engineering Value

These 4-40 UNC flat head screws are engineered to address common industrial challenges, such as vibration loosening and material fatigue. The black-oxide alloy steel construction, combined with a Torx Plus IP10 drive, ensures maximum torque transfer and minimizes slippage, making them ideal for precision equipment, automotive assemblies, and electronics enclosures. The Class 3A thread fit and coarse threading provide reliable fastening in metals and plastics, reducing installation errors. With an 82° countersink angle, they sit flush to prevent snagging, while full threading offers uniform load distribution. These features make them a trusted choice for OEMs and maintenance teams seeking durability and compliance with ASME B18.3 standards in harsh environments.

Specification Summary & Compliance

This product adheres to precise dimensional tolerances, including a Class 3A thread fit per UNC standards for superior accuracy. It meets ASME B18.3 specifications (ASTM F835) for consistency in manufacturing. Compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) ensures environmental safety and material restrictions are upheld, supporting use in regulated industries worldwide.