S-90585A599 5/16"-18 x 3 1/2" ASME B18.3 Stainless Steel Hex Drive Flat Head Screws
Stainless Steel Hex Drive Flat 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 316 stainless steel construction, ideal for harsh chemical and marine environments
- Exceptional mechanical strength with 70,000 psi tensile strength and Rockwell B55 hardness for heavy-duty applications
- Precise thread engagement with Class 3A thread fit ensuring reliable fastening and vibration resistance
- Enhanced surface protection through passivated finish for improved durability and extended service life
- Optimal flush mounting with standard 82° countersink angle and flat head design for seamless installations
- Efficient installation using 3/16" hex drive for secure torque application and reduced tool slippage
- Full thread coverage along the 3½" length for maximum grip strength in demanding applications
Professional Applications & Engineering Value
Engineered for demanding industrial environments, these 316 stainless steel flat head screws deliver exceptional performance where corrosion resistance and structural integrity are paramount. The passivated finish provides an additional protective layer against chemical exposure and atmospheric corrosion, making them ideal for marine equipment, chemical processing plants, and food processing machinery. The Class 3A thread fit ensures precise mating with corresponding nuts and tapped holes, minimizing the risk of loosening under vibration while maintaining consistent clamping force. With full threading along the entire 3½" length and 82° countersink angle, these screws provide reliable fastening in applications requiring flush surface mounting and maximum load distribution.
Specification Summary & Compliance
Manufactured to ASME B18.3 specifications with Class 3A thread fit for superior dimensional accuracy and interchangeability. Features UNC coarse threading (5/16"-18) with right-hand direction and meets stringent regulatory requirements including RoHS 3 (2015/863/EU) compliance and REACH (EC 1907/2006) compliance. The inch-system fasteners maintain precise head diameter tolerance (-0.056" to 0") and are fully threaded for consistent performance across industrial applications.
