S-92245A543 1/4"-20 x 1 1/8" FF-S-85, MS35307-309 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 tensile strength of 70,000 psi ensures reliable performance under heavy loads and vibration
- Rockwell B74 hardness provides excellent durability and resistance to wear over time
- External hex drive design allows for easy installation and removal with standard tools
- UNC coarse threading offers faster assembly and reduced cross-threading risks
- Partial threading provides unthreaded shank for precise clamping and shear strength
- Compliance with RoHS 3 and REACH ensures environmental safety and regulatory acceptance
Professional Applications & Engineering Value
This 1/4"-20 hex head screw delivers exceptional engineering value in demanding applications where corrosion resistance and mechanical strength are critical. The passivated 18-8 stainless steel material prevents rust and chemical degradation, making it suitable for marine, chemical processing, and outdoor equipment. The UNC coarse thread configuration ensures quick, secure fastening in metal assemblies, while the partial threading design maintains structural integrity by providing an unthreaded section for improved shear resistance. With its external hex drive and standardized dimensions, this screw simplifies maintenance and replacement in industrial machinery, construction projects, and transportation equipment where reliability and compliance with federal specifications are paramount.
Specification Summary & Compliance
This hex head screw features Class 2A thread fit for consistent engagement and assembly precision. It meets Fed. Spec. FF-S-85 (MS35307-309) manufacturing standards and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. The inch-system dimensions include 1/4"-20 UNC coarse threads with a minimum thread length of 3/4" and overall length of 1-1/8", ensuring interchangeability and reliability in standardized industrial applications.
