S-92245A563 1/4"-28 x 5/8" FF-S-85, MS35308-305 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 industrial environments
- High-strength performance delivering 70,000 psi tensile strength and Rockwell B74 hardness for reliable load-bearing applications
- Precise thread engagement with Class 2A thread fit and UNF fine threads, ensuring secure fastening and vibration resistance
- Efficient installation and removal via external hex drive and standard 7/16" head width, compatible with common tools
- Full threading for maximum grip across the entire 5/8" length, providing uniform clamping force
- Compliance with rigorous standards including Fed. Spec. FF-S-85 (MS35308-305), RoHS 3, and REACH for quality assurance
- Durable surface treatment that enhances wear resistance and maintains integrity under repeated use
Professional Applications & Engineering Value
This 1/4"-28 UNF hex head screw is engineered to address critical challenges in industrial assembly, where corrosion, vibration, and mechanical stress are common. The passivated 18-8 stainless steel material offers excellent resistance to oxidation and chemical exposure, making it suitable for applications in marine, automotive, and machinery sectors. The fine thread spacing and Class 2A thread fit provide superior holding power, reducing the risk of loosening in dynamic environments. With a fully threaded design and external hex drive, it ensures quick, secure installations, minimizing downtime. Ideal for high-stress fastening in equipment that demands reliability, this screw combines material durability with precision engineering to extend service life and reduce maintenance costs.
Specification Summary & Compliance
This fastener adheres to Class 2A thread fit tolerances per UNF standards, with a thread size of 1/4"-28 and fine spacing. It meets Fed. Spec. FF-S-85 (MS35308-305) for dimensional and performance requirements, and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material integrity.
