S-90550A107 1/2"-13 x 1 1/2" 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 and outdoor applications.
- Enhanced torque transmission via the 5/16" hex drive, reducing tool slippage and ensuring secure, efficient installation.
- Reliable thread engagement with Class 3A fit and UNC coarse threads, providing excellent vibration resistance and holding power.
- Streamlined flush installation thanks to the standard flat head profile and 82° countersink angle for a smooth, professional finish.
- Precise pressure equalization through the vented design with 1/8" vent diameter, preventing pressure buildup during tightening.
- Full-threaded length maximizes grip and load distribution across the entire 1-1/2" screw for consistent performance.
- Compliance with major industry standards including ASME B18.3, ASTM F879, and MIL-DTL-18240, ensuring interchangeability and reliability.
Professional Applications & Engineering Value
These 1/2"-13 UNC flat head screws in 18-8 stainless steel are engineered to address common industrial challenges such as corrosion, vibration loosening, and installation precision. The fully threaded design with coarse UNC threads ensures rapid assembly and superior retention in materials like metal, wood, and composites, reducing the risk of strip-out. The hex drive allows for high-torque applications without cam-out, while the vented feature prevents air or fluid entrapment, making them ideal for pressurized systems, machinery, and structural frameworks. Their corrosion-resistant properties make them suitable for marine, chemical, and outdoor equipment, delivering long-term durability and minimal maintenance.
Specification Summary & Compliance
This screw features a 1/2"-13 UNC thread with Class 3A fit for precise tolerance, ensuring reliable thread engagement. It is fully threaded with a length of 1-1/2" and includes an 82° countersink angle and 1/8" vent diameter. Manufactured in compliance with ASME B18.3, ASTM F879, and MIL-DTL-18240 specifications, and meets RoHS 3 and REACH environmental regulations for safe, sustainable use.
