S-90550A840 5/16"-18 x 1" ASME B18.3, ASTM F879, MIL-DTL-18240 Venting Stainless Steel Hex-Drive Flat Head Screws
Venting Stainless Steel Hex-Drive Flat Head Screws
Image may differ from product. See technical specification for details.
Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Material & Strength
Temperature & Environment
- Fast delivery
- Enjoy discounts on bulk purchases
- Secure Payment
- Fast Global Shipping
Key Features & Benefits at a Glance
- Superior corrosion resistance from 18-8 stainless steel construction for extended service life in harsh environments
- Precise Class 3A thread fit ensures reliable engagement and vibration resistance in critical assemblies
- Vented design with 0.078" diameter prevents pressure buildup and allows for easier installation in sealed applications
- 82° countersink angle provides flush mounting and clean aesthetic finish in precision applications
- 3/16" hex drive delivers secure tool engagement and high torque transmission during installation
- Fully threaded design maximizes grip length and load distribution across the entire fastener
- Industry standard compliance including ASME B18.3, ASTM F879, and MIL-DTL-18240 ensures consistent quality and performance
Professional Applications & Engineering Value
This 18-8 stainless steel flat head screw with 5/16"-18 UNC coarse threading is engineered to solve critical fastening challenges in demanding industrial environments. The combination of Class 3A thread fit and fully threaded design provides exceptional vibration resistance and load distribution, making it ideal for machinery, equipment manufacturing, and structural applications where reliability is paramount. The vented feature addresses pressure differential issues in sealed systems, while the 82° countersink angle ensures flush mounting in precision assemblies. Manufactured from corrosion-resistant 18-8 stainless steel, these hex drive screws maintain integrity in moist, chemical, or outdoor environments, reducing maintenance frequency and replacement costs.
Specification Summary & Compliance
This flat head screw features 5/16"-18 UNC coarse threading with Class 3A fit for precision engagement, manufactured to ASME B18.3, ASTM F879, and MIL-DTL-18240 specifications. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across various industrial applications while meeting stringent quality and performance standards.
