S-92245A757 1/2"-20 x 1 3/4" FF-S-85, MS35308-414 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 long-term reliability
• Exceptional mechanical strength with 70,000 psi tensile strength and Rockwell B74 hardness, ensuring dependable performance under high stress
• Optimized load distribution through partial threading design, reducing thread stripping risk and improving joint integrity
• Precise and secure fastening with Class 2A thread fit and UNF fine threads, minimizing loosening from vibrations
• Easy installation and removal using standard external hex drive and 3/4" head width, compatible with common tools for efficient maintenance
• Compliance with strict industry standards including Fed. Spec. FF-S-85 (MS35308-414), ensuring consistent quality and interchangeability
• Environmentally responsible manufacturing with RoHS 3 and REACH compliance, meeting global regulatory requirements

Professional Applications & Engineering Value

This 1/2"-20 UNF partially threaded hex head screw delivers critical engineering solutions for demanding industrial assemblies. The passivated 18-8 stainless steel provides excellent corrosion resistance, essential for outdoor equipment, marine hardware, and chemical processing applications where moisture and corrosive agents are present. Its partial threading concentrates clamping force closer to the head, preventing thread damage in soft materials and reducing stress concentration. With a fine thread spacing and Class 2A thread fit, it maintains tight tolerances in high-vibration environments like machinery, automotive systems, and structural frameworks. The external hex drive and substantial head design allow for high torque application, ensuring secure fastening in heavy-duty operations while meeting Fed. Spec. FF-S-85 for reliable performance in government and aerospace contracts.

Specification Summary & Compliance

This hex head screw features a 1/2"-20 UNF thread with Class 2A fit for precise dimensional accuracy, a length of 1 3/4", and a minimum thread length of 1 1/4". It is manufactured in accordance with Fed. Spec. FF-S-85 (identified as MS35308-414) and is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe and sustainable use across global markets.