S-92245A915 5/16"-18 x 3 1/2" FF-S-85, MS35307-346 Mil. Spec. 18-8 Stainless Steel Hex Head Screws
Mil. Spec. 18-8 Stainless Steel Hex Head Screws
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Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Material & Strength
Temperature & Environment
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Key Features & Benefits at a Glance
- Exceptional corrosion resistance with passivated 18-8 stainless steel construction, ideal for harsh industrial environments.
- High tensile strength of 70,000 PSI ensures reliable performance under heavy loads and mechanical stress.
- Coarse UNC thread with Class 2A fit provides faster assembly and secure fastening in a wide range of materials.
- Partially threaded shank design allows for precise clamping force and prevents thread damage during installation.
- External hex drive and hex head enable high-torque application with standard tools, reducing installation time.
- Compliance with Fed. Spec. FF-S-85 (MS35307-346) guarantees consistent quality and interchangeability for government and industrial projects.
- RoHS 3 and REACH compliance ensures environmental safety and regulatory adherence for global supply chains.
Professional Applications & Engineering Value
This 5/16"-18 UNC hex head screw is engineered to address critical challenges in demanding applications where corrosion resistance and mechanical integrity are paramount. The passivated 18-8 stainless steel material provides excellent protection against rust and chemical exposure, making it suitable for outdoor equipment, marine hardware, and chemical processing facilities. Its partially threaded configuration ensures that the unthreaded portion bears directly on the clamped materials, distributing stress evenly and preventing loosening under vibration. With a coarse thread design, it offers superior grip in soft materials and faster installation, reducing labor costs in assembly lines. The 70,000 PSI tensile strength and Rockwell B74 hardness deliver durability for structural frameworks, machinery, and heavy-duty fixtures, ensuring long-term reliability without frequent maintenance.
Specification Summary & Compliance
This screw features precise Class 2A thread fit and UNC coarse threading with a diameter of 0.3125" and length of 3-1/2", manufactured to Fed. Spec. FF-S-85 (MS35307-346). It complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental and safety standards are met for industrial use.
