S-90585A145 5/16"-24 x 3/4" ASME B18.3, ASTM F879 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 with passivated surface treatment
• Exceptional mechanical strength with 70,000 psi tensile strength and Rockwell B55 hardness for reliable load-bearing performance
• Precise thread engagement through Class 3A thread fit and UNF fine threading, ensuring vibration resistance and secure fastening
• Optimal flush mounting with standard 82° countersink angle and flat head design for clean, professional installations
• Easy installation and removal using standard 3/16" hex drive tooling, reducing assembly time and labor costs
• Full thread coverage along the entire 3/4" length provides maximum grip and uniform stress distribution
• Regulatory compliance assurance meeting ASME B18.3, ASTM F879, RoHS 3, and REACH standards for global industrial applications

Professional Applications & Engineering Value

These 316 stainless steel flat head screws deliver critical performance advantages in demanding industrial environments where corrosion resistance and mechanical reliability are paramount. The combination of UNF fine threading with Class 3A precision fit ensures superior vibration resistance in machinery, automotive assemblies, and marine equipment, while the passivated finish significantly enhances longevity in chemically aggressive settings. The 82° countersink angle and flat head profile facilitate seamless integration in applications requiring flush surfaces, from precision instruments to structural frameworks. With 70000 psi tensile strength and full threading, these fasteners maintain joint integrity under dynamic loads, making them ideal for critical connections in manufacturing, chemical processing, and offshore installations where failure is not an option.

Specification Summary & Compliance

Manufactured to exacting dimensional standards with Class 3A thread fit tolerance and UNF (Unified National Fine) thread specification. Complies with ASME B18.3 and ASTM F879 manufacturing specifications. Meets environmental regulations including RoHS 3 (2015/863/EU) compliance and REACH (EC 1907/2006) standards for hazardous substance restrictions. The inch-system measurements ensure compatibility with North American industrial specifications and tooling.