S-92245A911 1/4"-20 x 3 1/2" FF-S-85, MS35307-320 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 environments and outdoor applications.
- Superior mechanical strength offering 70,000 psi tensile strength and Rockwell B74 hardness for reliable performance under high stress.
- Optimized thread engagement with UNC coarse threading and Class 2A fit, ensuring easy installation and secure fastening in various materials.
- Versatile partial threading design providing a non-threaded shank for precise clamping and alignment in structural assemblies.
- External hex drive compatibility allowing for high-torque application with standard tools, reducing installation time and effort.
- Compliance with stringent regulations including RoHS 3 and REACH, ensuring environmental safety and material reliability.
- Long-term durability backed by Fed. Spec. FF-S-85 (MS35307-320) conformance, guaranteeing consistent quality and performance.
Professional Applications & Engineering Value
This 1/4"-20 x 3 1/2" partially threaded hex head screw is engineered to address critical challenges in industrial and construction settings. The passivated 18-8 stainless steel material provides excellent resistance to oxidation and chemical exposure, making it suitable for marine, chemical processing, and outdoor infrastructure. The UNC coarse thread and Class 2A fit facilitate quick assembly and reduce cross-threading risks, while the partial threading design enhances grip and stability in wood, metal, and composite applications. With a 70,000 psi tensile strength, it reliably supports heavy loads in machinery, framing, and equipment assembly, minimizing failure risks and maintenance needs.
Specification Summary & Compliance
This screw features a 1/4"-20 UNC coarse thread with Class 2A dimensional accuracy, ensuring precise fit and interchangeability. It is manufactured in compliance with Fed. Spec. FF-S-85 (MS35307-320) and meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental standards, confirming its safety and sustainability. The partial threading extends to a minimum of 3/4", and the external hex drive supports efficient installation with standard tools.
