S-92245A596 5/16"-18 x 3" FF-S-85, MS35307-344 Mil. Spec. 18-8 Stainless Steel Hex Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with passivated 18-8 stainless steel construction for extended service life in harsh environments
• High tensile strength of 70,000 PSI ensures reliable performance under heavy loads and vibration
• External hex drive design provides secure tool engagement and prevents stripping during installation
• Class 2A thread fit offers optimal clearance for faster assembly while maintaining secure connections
• Partially threaded shank allows for precise clamping force control and reduced thread galling
• Coarse UNC threading enables quick installation and superior performance in softer materials
• Full regulatory compliance with RoHS 3 and REACH standards for global industrial applications

Professional Applications & Engineering Value

This 5/16"-18 UNC hex head screw delivers exceptional engineering value for industrial fastening applications where corrosion resistance and structural integrity are critical. The passivated 18-8 stainless steel construction provides superior protection against oxidation and chemical exposure, making it ideal for marine, chemical processing, and outdoor equipment applications. The partially threaded design concentrates clamping force precisely where needed, reducing stress concentration and preventing joint loosening under vibration. With coarse thread spacing and external hex drive, installation efficiency is maximized while maintaining the high 70,000 PSI tensile strength required for heavy-duty structural connections. These screws are engineered to meet rigorous Fed. Spec. FF-S-85 (MS35307-344) requirements, ensuring consistent performance in demanding industrial environments.

Specification Summary & Compliance

This hex head screw features precision Class 2A thread fit with UNC coarse thread spacing and right-hand thread direction. Manufacturing complies with Fed. Spec. FF-S-85 (MS35307-344) specifications, ensuring dimensional accuracy and performance consistency. The fastener is fully RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting international environmental and safety standards for industrial use. With Rockwell B74 hardness and maintained dimensional tolerances throughout the 3" length, this screw delivers reliable performance across various assembly applications.