S-92245A585 5/16"-18 x 1 1/4" FF-S-85, MS35307-336 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, ideal for harsh industrial environments
• High tensile strength of 70,000 psi ensures reliable performance under heavy loads and vibration
• Class 2A thread fit with UNC coarse spacing provides easier assembly and reduced cross-threading risks
• External hex drive design allows for secure tool engagement and high torque application
• Partial threading offers optimal grip length for precise clamping in various material thicknesses
• Compliance with Fed. Spec. FF-S-85 (MS35307-336) guarantees consistent quality and interchangeability
• RoHS 3 and REACH compliance ensures environmental safety and regulatory acceptance in global markets

Professional Applications & Engineering Value

These 5/16"-18 UNC hex head screws deliver exceptional engineering value in demanding applications where corrosion resistance and mechanical strength are critical. The passivated 18-8 stainless steel material provides excellent protection against oxidation and chemical exposure, making these fasteners ideal for marine, chemical processing, and outdoor equipment assemblies. The coarse UNC thread spacing ensures rapid installation and superior performance in softer materials or where vibration resistance is required. With partial threading and Class 2A thread fit, these screws maintain precise clamping force while minimizing the risk of thread damage during repeated disassembly. The external hex drive configuration accommodates standard tools for efficient maintenance in confined spaces, while the 70,000 psi tensile strength ensures long-term reliability in structural applications and heavy machinery.

Specification Summary & Compliance

This 5/16"-18 UNC hex head screw features precise Class 2A thread fit with coarse spacing, manufactured to Fed. Spec. FF-S-85 (MS35307-336) standards. The fastener maintains dimensional accuracy with a thread diameter of 0.3125" and minimum thread length of 7/8". Compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations ensures environmental safety and material transparency throughout the supply chain.