S-92245A553 1/4"-20 x 2 1/2" FF-S-85, MS35307-316 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 and outdoor applications.
• High tensile strength of 70,000 PSI ensures reliable performance under heavy loads, reducing the risk of fastener failure in critical assemblies.
• Class 2A thread fit provides consistent, easy assembly and disassembly while maintaining secure fastening integrity.
• Partially threaded shank design allows for precise clamping force application, minimizing material stress and improving joint stability.
• External hex drive and hex head enable high-torque installation with standard tools, speeding up assembly processes.
• Compliance with RoHS 3 and REACH ensures environmental safety and regulatory acceptance for global supply chains.
• UNC coarse threads offer quick engagement and resistance to vibration loosening in coarse-grained materials.

Professional Applications & Engineering Value

Engineered for demanding industrial applications, this 1/4"-20 x 2-1/2" partially threaded hex head screw combines 18-8 stainless steel with a passivated surface treatment to combat corrosion in marine, chemical, and high-moisture settings. The UNC coarse thread and Class 2A fit ensure rapid, reliable installation in machinery, structural frames, and heavy equipment, where vibration resistance and durability are critical. Its partially threaded design concentrates clamping force precisely, reducing the risk of material damage in wood, metal, or composite assemblies. By meeting Fed. Spec. FF-S-85 (MS35307-316), it provides assurance for aerospace, defense, and OEM projects requiring traceable, high-performance inch fasteners.

Specification Summary & Compliance

This screw features a 1/4"-20 UNC coarse thread with Class 2A dimensional accuracy, ensuring consistent thread engagement and interchangeability. It complies with Fed. Spec. FF-S-85 (identifying MS35307-316) for material and manufacturing standards, and is verified as RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliant, supporting environmental and safety regulations. The partially threaded configuration, with a minimum thread length of 3/4", and mechanical properties including 70,000 PSI tensile strength and Rockwell B74 hardness, confirm its suitability for high-stress applications.