S-90585A058 3/8"-16 x 5/8" ASME B18.3 Stainless Steel Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance thanks to 316 Stainless Steel construction with passivated finish, ideal for harsh environments and chemical exposure
• Exceptional mechanical strength with 70,000 psi tensile strength and Rockwell B55 hardness for reliable performance under heavy loads
• Precise thread engagement with Class 3A thread fit ensuring secure fastening and vibration resistance in critical assemblies
• Optimal flush mounting featuring standard 82° countersink angle and flat head design for smooth surface finishes
• Enhanced installation efficiency through hex drive (7/32") design allowing high-torque application without cam-out
• Broad industrial compatibility with UNC coarse threads (3/8"-16) providing excellent grip in various materials
• Full-threaded reliability ensuring maximum holding power along the entire 5/8" length

Professional Applications & Engineering Value

Engineered for demanding industrial environments, these 316 Stainless Steel flat head screws deliver critical corrosion resistance where exposure to chemicals, moisture, or salt spray would compromise ordinary fasteners. The combination of 70,000 psi tensile strength and Class 3A thread fit ensures reliable performance in high-vibration applications such as heavy machinery, marine equipment, and chemical processing systems. The 82° countersink angle provides flush mounting in precision assemblies where surface continuity is essential, while the hex drive configuration enables high-torque installation without stripping. These fully threaded UNC coarse thread fasteners offer superior pull-out resistance in both metal and composite materials, making them ideal for structural applications requiring both strength and corrosion protection.

Specification Summary & Compliance

Manufactured to exacting standards with Class 3A thread fit precision and UNC coarse thread spacing (3/8"-16). Compliant with ASME B18.3 specifications for dimensional accuracy and performance. Meets environmental regulations including RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance. Features include 0.781" head diameter, 5/8" length, and right-hand thread direction for standard industrial applications.