S-97690A149 4-40 x 5/16" ASME B18.6.3 Steel Pan Head Torx Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with zinc-plated steel construction for extended service life in demanding environments
• Enhanced torque transmission through T10 Torx drive design, reducing cam-out and tool wear
• Optimized seating and appearance with rounded pan head profile and black painted finish
• Reliable thread engagement with Class 2A thread fit and coarse UNC threading for faster assembly
• Consistent mechanical performance maintained through Rockwell B70 hardness rating
• Full threading capability ensures maximum grip length and versatile fastening applications
• Regulatory compliance assurance meeting ASME B18.6.3 standards and environmental directives

Professional Applications & Engineering Value

These 4-40 UNC zinc-plated steel screws with T10 Torx drive provide exceptional value in precision assembly applications where corrosion resistance and reliable fastening are critical. The rounded pan head design offers improved aesthetics while distributing clamp load effectively, making them ideal for electronic enclosures, machinery panels, and automotive components. The zinc plating combined with black painted finish delivers dual-layer protection against environmental factors, while the coarse thread configuration ensures rapid installation in various materials. Engineered to Rockwell B70 hardness, these fasteners maintain structural integrity under vibration and load stresses common in industrial settings.

Specification Summary & Compliance

Manufactured to precise dimensional standards with Class 2A thread fit tolerance and UNC coarse thread profile (4-40 size). These 5/16" length screws feature complete compliance with ASME B18.6.3 mechanical specifications. Environmental compliance includes RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring safe use in global markets. The fully threaded design provides consistent engagement throughout the fastener length.