S-90022A116 4-40 x 1/2" ASME B18.3 Steel Pan Head Torx Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with zinc-plated steel construction for extended service life in harsh industrial environments
• Enhanced torque transmission through T10 Torx drive design, reducing cam-out and tool wear during installation
• Reliable thread engagement with fully threaded UNC coarse pattern ensuring maximum holding power in various materials
• Consistent performance maintained through Class 2A thread fit for precise assembly and vibration resistance
• High mechanical strength delivering 40,000 psi tensile strength and Rockwell B70 hardness for demanding applications
• Optimized head design with rounded pan profile providing flush mounting and improved aesthetic finish
• Regulatory compliance meeting ASME B18.3 standards and environmental regulations for global industrial use

Professional Applications & Engineering Value

These 4-40 UNC zinc-plated steel screws with T10 Torx drive address critical challenges in precision assembly operations. The combination of zinc-plated steel material and coarse UNC threading provides exceptional corrosion resistance while maintaining secure fastening in softer substrates where fine threads might strip. The fully threaded design ensures consistent clamping force distribution across the entire fastener length, preventing joint loosening under vibration - a common issue in machinery and electronic enclosures. With their rounded pan head profile, these screws offer both functional and aesthetic advantages, sitting flush with surfaces while the Torx drive system enables higher torque application without damaging the drive recess, making them ideal for automated assembly lines and maintenance applications requiring repeated access.

Specification Summary & Compliance

Manufactured to precise dimensional standards with Class 2A thread fit tolerance for consistent assembly performance. These rounded head screws comply with ASME B18.3 specifications for dimensional accuracy and mechanical properties. Environmental compliance is verified through RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring restricted substance compliance for international industrial markets. The combination of 40,000 psi tensile strength and Rockwell B70 hardness guarantees mechanical reliability across demanding applications.