S-97690A153 4-40 x 1/2" ASME B18.6.3 Steel Pan Head Torx Screws

Key Features & Benefits at a Glance

• Enhanced corrosion resistance with zinc-plated steel construction for reliable performance in demanding industrial environments
• Superior torque transmission through T10 Torx drive system, minimizing cam-out and tool slippage during installation
• Optimized thread engagement with Class 2A UNC coarse threads ensuring secure fastening and vibration resistance
• Exceptional mechanical strength backed by Rockwell B70 hardness rating for long-term structural integrity
• Streamlined assembly process with fully threaded design allowing consistent clamping force along the entire 1/2" length
• Professional aesthetic integration through black painted finish that maintains appearance while providing additional surface protection
• Regulatory compliance assurance meeting ASME B18.6.3 specifications and environmental standards including RoHS 3 and REACH

Professional Applications & Engineering Value

These 4-40 UNC zinc-plated steel rounded head screws deliver critical engineering solutions for industrial assembly challenges. The Torx T10 drive system provides superior torque transfer compared to traditional drive types, significantly reducing fastener damage during high-torque applications. The coarse thread design ensures rapid installation and reliable performance in materials where fine threads might strip or fail. With Rockwell B70 hardness, these fasteners maintain structural integrity under stress, while the zinc plating combined with black paint finish offers dual-layer protection against corrosion in manufacturing, automotive, and electronic enclosure applications. The fully threaded 1/2" length and standard pan head profile create uniform clamping force distribution, making them ideal for securing components where vibration resistance and consistent pressure are paramount.

Specification Summary & Compliance

Manufactured to precise dimensional standards with Class 2A thread fit tolerance ensuring consistent performance across applications. These screws conform to ASME B18.6.3 specifications for mechanical and dimensional requirements. Environmental compliance includes RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming they contain no restricted substances above permitted thresholds. The UNC coarse thread pattern with right-hand threading follows industry-standard specifications for compatibility with standard mating components.