S-90585A635 3/8"-16 x 2 1/2" ASME B18.3 Stainless Steel Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance in harsh environments thanks to 316 stainless steel construction and passivated finish
• Exceptional mechanical strength with 70,000 psi tensile strength and Rockwell B55 hardness for reliable load-bearing performance
• Precise flush mounting enabled by the standard 82° countersink angle and flat head design
• Efficient installation and removal with hex drive (7/32") and coarse UNC threading for quick assembly
• Consistent thread engagement ensured by Class 3A thread fit and full threading along the 2 1/2" length
• Regulatory compliance assurance meeting ASME B18.3 standards and environmental regulations (RoHS 3, REACH)
• Dimensional reliability with controlled head diameter tolerance for uniform performance in precision applications

Professional Applications & Engineering Value

These 316 stainless steel flat head screws deliver critical performance in demanding industrial settings where corrosion resistance and mechanical integrity are paramount. The combination of UNC coarse threading and Class 3A thread fit ensures secure fastening in vibration-prone equipment, while the passivated finish provides enhanced protection against chemical exposure in marine, chemical processing, and food industry applications. The 82° countersink angle and flat head profile create seamless surface finishes in machinery, structural assemblies, and precision equipment, eliminating protrusions that could interfere with operation. With full threading along the entire 2½" length, these screws maintain consistent clamping force across the entire engagement area, preventing loosening under dynamic loads.

Specification Summary & Compliance

This 3/8"-16 UNC flat head screw maintains precise dimensional control with Class 3A thread fit tolerances and head diameter tolerance of -0.061" to 0". Manufacturing and quality comply with ASME B18.3 specifications, ensuring consistent performance in industrial fastening applications. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, making it suitable for global industrial supply chains with strict chemical substance restrictions.