S-90585A718 1/2"-13 x 1 3/4" ASME B18.3 Stainless Steel Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 316 stainless steel construction, ideal for harsh chemical and marine environments
• Exceptional thread engagement with Class 3A precision fit ensuring reliable, vibration-resistant fastening
• High-strength performance with 70,000 psi tensile strength and Rockwell B55 hardness for demanding applications
• Enhanced durability through passivated surface treatment providing extended service life in corrosive conditions
• Optimized installation with 5/16" hex drive and standard 82° countersink angle for flush mounting and secure torque application
• Full-threaded design offering maximum grip length and uniform stress distribution along the entire fastener
• Industry compliance meeting ASME B18.3 specifications and environmental regulations for global project acceptance

Professional Applications & Engineering Value

Engineered for demanding industrial environments, this 316 stainless steel flat head screw delivers exceptional performance where corrosion resistance and structural integrity are paramount. The Class 3A thread fit provides precise mechanical engagement that resists loosening under vibration and dynamic loads, while the passivated finish creates an additional protective oxide layer against chemical attack and pitting. The 1/2"-13 UNC coarse thread pattern ensures rapid installation and reliable holding power in various materials, from structural steel to corrosion-resistant alloys. With its 82° countersink angle and flat head design, it achieves flush surface mounting critical for machinery, processing equipment, and marine applications where protrusions compromise safety and functionality. The combination of 70,000 psi tensile strength and full threading makes it ideal for heavy-duty fastening in chemical processing plants, offshore platforms, and food processing equipment where reliability cannot be compromised.

Specification Summary & Compliance

This flat head screw features precision 1/2"-13 UNC coarse threads with Class 3A thread fit tolerance for superior mechanical engagement. Manufacturing complies with ASME B18.3 specifications for dimensional accuracy and performance standards. The fastener is fully compliant with RoHS 3 (2015/863/EU) restrictions on hazardous substances and REACH (EC 1907/2006) regulations for chemical safety, ensuring environmental responsibility in industrial applications worldwide.