S-90910A716 4-40 x 3/8" ASME B18.3 Stainless Steel Button Head Torx Plus Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel and passivated finish for extended service life in harsh environments
• Enhanced torque transmission and reduced cam-out through Torx Plus IP8 drive system for reliable, high-torque installations
• High mechanical strength with 60,000 psi tensile strength and Rockwell B55 hardness to withstand demanding loads
• Precise thread engagement with Class 2A UNC coarse threads ensuring consistent fit and vibration resistance
• Low-profile rounded button head design providing a finished appearance while minimizing protrusion in tight spaces
• Full 3/8" threading for maximum grip length and superior holding power across the entire fastener
• Regulatory compliance assurance meeting ASME B18.3, RoHS 3, and REACH standards for global industrial applications

Professional Applications & Engineering Value

These 4-40 UNC Torx Plus rounded head screws deliver exceptional engineering value in precision assembly applications where reliability is critical. The 18-8 stainless steel construction with passivated finish provides superior corrosion resistance for demanding environments including marine, chemical processing, and outdoor equipment. The Torx Plus IP8 drive system eliminates cam-out issues common in Phillips drives, ensuring consistent torque application during high-volume production. The rounded button head profile offers both aesthetic appeal and functional clearance in confined spaces, while the Class 2A thread fit with coarse UNC threading enables rapid assembly without compromising joint integrity. These features combine to solve common industrial challenges including fastener stripping, corrosion failure, and installation inefficiency.

Specification Summary & Compliance

This 4-40 UNC screw maintains precision Class 2A thread fit tolerances with coarse thread spacing for optimal engagement. Manufacturing adheres to ASME B18.3 specifications ensuring dimensional consistency and performance reliability. The fastener is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming environmental safety and material restrictions adherence. With 3/8" length, 0.213" head diameter, and right-hand threading, these screws deliver standardized performance across industrial applications requiring precision screws with certified quality assurance.