S-92245A552 1/4"-20 x 2 1/4" FF-S-85, MS35307-315 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 resistance to mechanical failure in demanding applications.
• Rockwell B74 hardness provides excellent durability and wear resistance, reducing the need for frequent replacements.
• UNC coarse threading with Class 2A fit allows for quick, secure installation and easy disassembly, minimizing assembly time.
• External hex drive design offers straightforward tool engagement and high torque application for firm fastening.
• Partial threading enables precise clamping control and reduces the risk of thread damage in variable material thicknesses.
• Compliance with Fed. Spec. FF-S-85 (MS35307-315) guarantees consistent quality and interchangeability for government and industrial projects.

Professional Applications & Engineering Value

This 1/4"-20 x 2-1/4" hex head screw is engineered to address common industrial challenges such as corrosion, vibration loosening, and high-stress conditions. Made from passivated 18-8 stainless steel, it provides exceptional resistance to rust and chemical exposure, making it suitable for outdoor, marine, and chemical processing equipment. The UNC coarse thread and Class 2A fit ensure reliable engagement in coarse-grained materials, reducing cross-threading risks and enhancing assembly efficiency. With a partially threaded shank, it offers optimal grip in applications where unthreaded sections prevent material distortion, such as in machinery frames, structural assemblies, and automotive components. Its external hex drive allows for high-torque installation using standard tools, streamlining maintenance and reducing downtime in production environments.

Specification Summary & Compliance

This screw features precise UNC coarse threading with a Class 2A thread fit, ensuring dimensional accuracy and easy assembly. It meets Fed. Spec. FF-S-85 (MS35307-315) for consistent performance in federal and industrial applications. Additionally, it is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) standards, confirming its safety for use in regulated environments without hazardous substances.