S-92245A964 5/16"-18 x 3 1/4" FF-S-85, MS35307-345 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
- 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 structural integrity in demanding applications.
- Precision Class 2A thread fit guarantees consistent engagement and reduces the risk of cross-threading during assembly.
- External hex drive design provides secure tool engagement for efficient installation and removal with standard wrenches.
- Partially threaded shank allows for controlled clamping force and prevents over-tightening in specific joint designs.
- Compliance with Fed. Spec. FF-S-85 (MS35307-345) ensures adherence to rigorous industrial standards for quality and performance.
- RoHS 3 and REACH compliance confirms environmental responsibility and safe use in regulated markets.
Professional Applications & Engineering Value
This 5/16"-18 UNF hex head screw is engineered to address critical challenges in industrial assemblies where corrosion resistance and mechanical strength are paramount. The passivated 18-8 stainless steel material effectively combats oxidation and chemical exposure, making it suitable for marine, chemical processing, and outdoor equipment. Its fine thread spacing and Class 2A thread fit provide superior vibration resistance and secure fastening in dynamic load conditions. The external hex drive facilitates quick installation in confined spaces, while the partial threading optimizes grip length for precise tension control. Ideal for machinery, structural frameworks, and high-stress applications, this screw delivers consistent performance and reduces maintenance frequency.
Specification Summary & Compliance
This screw features a 5/16"-18 UNF thread with Class 2A tolerance for precise fit, a 3 1/4" length with 7/8" minimum thread length, and right-hand thread direction. It conforms to Fed. Spec. FF-S-85 (MS35307-345) and meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring both performance reliability and regulatory adherence.
