S-94414A322 4-40 x 5/16" ASME B18.3, ASTM F835 Alloy Steel Torx Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with black-oxide coating, ideal for harsh industrial environments.
• Exceptional torque transmission via Torx Plus IP10 drive, minimizing cam-out and tool wear.
• High tensile strength (140,000 psi) and Rockwell C39 hardness for reliable load-bearing in demanding applications.
• Precise Class 3A thread fit ensures secure fastening with reduced risk of cross-threading.
• 82° countersink angle allows for a flush, low-profile installation in assembled components.
• Full threading provides consistent engagement along the entire 5/16" length for uniform clamping force.
• Compliance with ASME B18.3 and ASTM F835 guarantees consistent quality and interchangeability.

Professional Applications & Engineering Value

These 4-40 UNC flat head screws are engineered to address critical challenges in precision assembly, such as vibration resistance and space constraints. The black-oxide alloy steel construction offers enhanced durability against wear and environmental exposure, while the Torx Plus drive ensures efficient torque application without slippage, reducing assembly time and tool damage. With a coarse thread spacing and Class 3A fit, they provide quick, reliable fastening in metals and plastics, making them ideal for electronics, machinery, and automotive components where high strength and compliance with industry standards are paramount.

Specification Summary & Compliance

This screw features a 4-40 UNC thread with Class 3A precision fit and coarse spacing, ensuring tight tolerances per ASME standards. It meets ASME B18.3 and ASTM F835 specifications for dimensional accuracy and performance. Additionally, it is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, supporting safe and sustainable use in global industrial markets.