S-92245A686 5/16"-18 x 1 3/8" FF-S-85, MS35307-337 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
- Class 2A thread fit provides consistent, precise engagement for smoother assembly and reduced cross-threading risks
- External hex drive design allows for high-torque installation using standard tools, speeding up maintenance and assembly
- Partially threaded shank offers optimal grip and clamping force where full threading isn't required
- Compliance with RoHS 3 and REACH ensures environmental safety and regulatory acceptance in global markets
- Coarse UNC threading enables quick installation and better debris resistance in demanding applications
Professional Applications & Engineering Value
Engineered for heavy-duty industrial applications, this 5/16"-18 UNC hex head screw addresses critical challenges in machinery assembly, structural frameworks, and outdoor equipment. The passivated 18-8 stainless steel provides exceptional resistance to oxidation and chemical exposure, prolonging service life in humid or corrosive settings. Its partially threaded design concentrates clamping force precisely, reducing stress concentration and preventing joint loosening under dynamic loads. With a 70,000 PSI tensile strength and Rockwell B74 hardness, it maintains integrity in high-stress environments, while the external hex drive ensures secure tool engagement for efficient installation and removal. Ideal for construction, automotive, and marine sectors where reliability and compliance are paramount.
Specification Summary & Compliance
This screw features a Class 2A thread fit per UNC standards, ensuring dimensional accuracy and interchangeability. It complies with Fed. Spec. FF-S-85 (MS35307-337) for consistent quality and performance. Environmental regulations including RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) are fully met, supporting sustainable and safe usage in regulated industries.
