S-90550A108 1/2"-13 x 1 3/4" ASME B18.3, ASTM F879, MIL-DTL-18240 Venting Stainless Steel Hex-Drive Flat Head Screws
Venting 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 18-8 Stainless Steel construction, ideal for harsh industrial environments
- Enhanced installation security provided by the 5/16" hex drive, preventing cam-out during high-torque applications
- Reliable thread engagement with Class 3A thread fit and UNC coarse threading for superior vibration resistance
- Optimized flush mounting through the standard 82° countersink angle and flat head design
- Pressure equalization capability via the vented design with 1/8" vent diameter, preventing fluid or air lock
- Full-length thread coverage across the 1-3/4" length ensures maximum holding power in deep applications
- Comprehensive compliance with major industrial standards including ASME B18.3, ASTM F879, and MIL-DTL-18240
Professional Applications & Engineering Value
This heavy-duty flat head screw delivers exceptional engineering value in demanding industrial applications where corrosion resistance and structural integrity are paramount. The 18-8 stainless steel composition provides excellent protection against rust and chemical degradation in marine, chemical processing, and outdoor equipment applications. The vented design solves critical pressure differential issues in sealed systems, while the UNC coarse threading and Class 3A thread fit ensure reliable performance in high-vibration environments. The combination of hex drive and fully threaded construction allows for secure installation in machinery, structural assemblies, and equipment requiring flush-mounted fastening solutions with maximum pull-out strength.
Specification Summary & Compliance
This 1/2"-13 UNC flat head screw features precise Class 3A thread fit tolerances and coarse threading per unified screw thread standards. Manufacturing complies with ASME B18.3, ASTM F879, and MIL-DTL-18240 specifications, ensuring consistent quality and performance. The product is fully RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting the latest environmental and safety regulations for industrial components.
