S-92245A935 1/4"-28 x 1 3/8" FF-S-85, MS35308-311 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 environments and extended service life
• High tensile strength of 70,000 psi ensures reliable load-bearing capacity and joint integrity under stress
• Precise Class 2A thread fit provides consistent engagement and reduces the risk of cross-threading during installation
• External hex drive design allows for easy installation and removal with standard tools, improving assembly efficiency
• Fine UNF thread spacing offers enhanced vibration resistance and superior clamping force in critical applications
• Partial threading enables secure fastening in materials where full threading isn't required, providing versatile application options
• Rockwell B74 hardness maintains thread integrity and resistance to wear through multiple installation cycles

Professional Applications & Engineering Value

This 1/4"-28 UNF hex head screw delivers exceptional performance in demanding industrial environments where corrosion resistance and mechanical reliability are paramount. The passivated 18-8 stainless steel construction provides superior protection against oxidation and chemical exposure, making it ideal for marine, chemical processing, and outdoor applications. The fine thread spacing and Class 2A thread fit ensure precise engagement in tapped holes, reducing the risk of stripping while maintaining consistent clamping force. With its external hex drive and partial threading, this fastener offers quick installation and optimal grip length control for machinery, equipment assembly, and structural frameworks where vibration resistance and long-term durability are critical requirements.

Specification Summary & Compliance

This hex head screw features 1/4"-28 UNF fine threads with Class 2A fit and 1-3/8" length with 3/4" minimum thread length. Manufactured to meet Fed. Spec. FF-S-85 (MS35308-311) standards, ensuring consistent quality and dimensional accuracy. The fastener is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, guaranteeing environmental safety and regulatory adherence for industrial applications worldwide.