S-92245A591 5/16"-18 x 2" FF-S-85, MS35307-340 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 long-term reliability in harsh environments
• Exceptional mechanical strength with 70,000 psi tensile strength and Rockwell B74 hardness to withstand high-stress applications
• Reliable fastening performance through Class 2A thread fit and UNC coarse threading for secure, vibration-resistant connections
• Optimized installation efficiency with external hex drive and standard 1/2" head width for easy tool access and torque application
• Enhanced load distribution through partially threaded design that maximizes grip length while maintaining precise thread engagement
• Regulatory compliance assurance meeting Fed. Spec. FF-S-85 (MS35307-340), RoHS 3, and REACH standards for quality and environmental safety
• Versatile industrial application with 2" length and right-hand threading suitable for various assembly requirements

Professional Applications & Engineering Value

This 5/16"-18 UNC hex head screw delivers critical engineering solutions where corrosion resistance and structural integrity are paramount. The passivated 18-8 stainless steel construction provides exceptional protection against oxidation and chemical degradation, making it ideal for marine, chemical processing, and outdoor industrial equipment. The partially threaded design ensures optimal clamping force distribution while preventing thread damage during installation. With coarse UNC threading and Class 2A thread fit, these fasteners maintain secure connections in high-vibration environments common in machinery, structural assemblies, and transportation equipment. The external hex drive configuration allows for high-torque installation using standard tools, streamlining assembly processes in manufacturing and maintenance operations.

Specification Summary & Compliance

This hex head screw features precise Class 2A thread fit with 5/16"-18 UNC coarse thread specification and minimum thread length of 7/8". Manufactured to exacting Fed. Spec. FF-S-85 (MS35307-340) standards, it ensures dimensional accuracy and performance consistency. The fastener is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, containing no restricted substances. With 0.3125" thread diameter and 2" overall length, it meets industrial requirements for strength-critical applications where reliability and regulatory adherence are essential.