S-90585A639 3/8"-16 x 3 1/2" ASME B18.3 Stainless Steel Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 316 stainless steel construction for extended service life in harsh environments
• Precise thread engagement with Class 3A thread fit ensuring reliable fastening and vibration resistance
• Enhanced durability from 70,000 psi tensile strength and Rockwell B55 hardness for heavy-duty applications
• Optimized drive performance with hex drive design providing secure tool engagement and reduced cam-out risk
• Improved chemical resistance through passivated surface treatment for additional protection against corrosive agents
• Full-threaded design offering maximum grip length and uniform stress distribution along the entire fastener
• Regulatory compliance meeting ASME B18.3 specifications and environmental standards including RoHS and REACH

Professional Applications & Engineering Value

These 316 stainless steel flat head screws with 3/8"-16 UNC coarse threading deliver exceptional performance in demanding industrial environments where corrosion resistance and structural integrity are paramount. The passivated finish provides an additional protective layer against chemical exposure, making these fully threaded fasteners ideal for marine equipment, chemical processing plants, and food processing machinery. The Class 3A thread fit ensures precise mating with corresponding nuts and tapped holes, reducing the risk of cross-threading while maintaining consistent clamping force. The 82° countersink angle allows for flush mounting in machinery components, structural assemblies, and equipment frames where surface profile requirements are critical. These hex drive screws with their high tensile strength rating are engineered to withstand significant mechanical stress while maintaining their corrosion-resistant properties throughout their service life.

Specification Summary & Compliance

Manufactured to ASME B18.3 specifications with Class 3A thread fit tolerance for precision threading. Features 3/8"-16 UNC coarse threads with complete threading along the 3½" length. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. The 316 stainless steel construction meets industry standards for corrosion resistance, while the passivated finish enhances surface protection. Mechanical properties include 70,000 psi tensile strength and Rockwell B55 hardness for reliable performance in industrial applications.