S-90550A109 1/2"-13 x 2" ASME B18.3, ASTM F879, MIL-DTL-18240 Venting Stainless Steel Hex-Drive Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction, ideal for harsh industrial environments
• Precise Class 3A thread fit ensures reliable, vibration-resistant connections in critical applications
• Vented screw technology with 1/8" vent diameter prevents pressure buildup and allows for drainage
• 82° countersink angle provides flush mounting and improved aerodynamics in assembled components
• Fully threaded design delivers maximum grip strength and load distribution along the entire 2" length
• Heavy-duty UNC coarse threading enables faster assembly and better performance in softer materials
• Hex drive compatibility with 5/16" drive size allows for high-torque installation with standard tools

Professional Applications & Engineering Value

This 1/2"-13 UNC flat head screw delivers exceptional engineering value in demanding industrial applications where corrosion resistance and vibration performance are critical. The 18-8 stainless steel construction withstands corrosive environments while maintaining structural integrity, making it ideal for marine equipment, chemical processing, and outdoor infrastructure. The Class 3A thread fit provides superior engagement with mating components, reducing the risk of loosening under dynamic loads. The vented screw feature with 1/8" diameter addresses pressure differential issues in sealed systems, while the 82° countersink angle ensures smooth surface transitions in aerospace and automotive assemblies. These fully threaded screws with coarse UNC spacing offer reliable fastening in both metal and composite materials, providing engineers with a versatile solution for heavy-duty fastening requirements.

Specification Summary & Compliance

This flat head screw features precision Class 3A thread fit with UNC coarse threading (1/2"-13) and right-hand thread direction. Manufacturing complies with ASME B18.3, ASTM F879, and MIL-DTL-18240 specifications, ensuring consistent quality and performance. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, meeting the latest industry standards for sustainable manufacturing practices.