S-92245A914 5/16"-18 x 2 3/4" FF-S-85, MS35307-343 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 load-bearing capacity and joint integrity under stress
• Rockwell B74 hardness provides excellent durability and resistance to wear during installation and use
• External hex drive design allows for easy installation and removal with standard tools, reducing assembly time
• Class 2A thread fit offers consistent, reliable engagement with standard nuts and threaded components
• Coarse UNC threading enables quick assembly and reduced cross-threading risk in various materials
• Partial threading provides unthreaded shank for precise clamping and shear strength in structural applications

Professional Applications & Engineering Value

This 5/16"-18 UNC hex head screw delivers exceptional performance in demanding industrial settings where corrosion resistance and mechanical strength are critical. The passivated 18-8 stainless steel construction provides superior protection against rust and chemical exposure, making it ideal for marine, chemical processing, and outdoor applications. The external hex drive ensures secure tool engagement, preventing stripping during high-torque installation. With its partial threading and coarse UNC thread spacing, this fastener offers optimal clamping force distribution and rapid assembly in structural frameworks, machinery, and equipment manufacturing. The combination of 70,000 psi tensile strength and Rockwell B74 hardness ensures long-term reliability in vibration-prone environments, reducing maintenance requirements and downtime.

Specification Summary & Compliance

This 2 3/4" hex head screw features Class 2A thread fit per UNC standards with 0.3125" thread diameter and 7/8" minimum thread length. Manufactured to meet Fed. Spec. FF-S-85 (MS35307-343) requirements, ensuring dimensional accuracy and performance consistency. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, making it suitable for global industrial applications with strict material restrictions.