S-90390A592 5/16"-18 x 2 1/4" Tapping Screws

Key Features & Benefits at a Glance

• Superior torque transmission with T40 Torx drive, reducing cam-out and tool wear for reliable fastening in repetitive industrial applications.
• Enhanced corrosion resistance from the black-phosphate steel coating, extending service life in demanding environments.
• Efficient thread cutting action with Type F design, creating strong internal threads in aluminum, brass, cast iron, and sheet metal without pre-tapping.
• Maximum material engagement due to fully threaded UNC coarse design, providing excellent pull-out resistance and vibration resistance.
• Flush, professional finish with 82° flat head and standard profile, ensuring a smooth surface and secure seating in countersunk holes.
• Optimized installation compatibility with specified 0.29" drill bit size, streamlining the assembly process and reducing setup time.
• Versatile application range across multiple metals, making it a cost-effective, multi-purpose fastener for various industrial projects.

Professional Applications & Engineering Value

These 5/16"-18 thread cutting tapping screws are engineered to solve common industrial fastening challenges in materials like aluminum, brass, cast iron, and sheet metal. The black-phosphate steel construction offers durability and corrosion resistance, while the Type F thread cutting design eliminates the need for separate tapping operations, saving time and labor costs. The T40 Torx drive ensures high torque transmission without slippage, critical for assembly lines where consistency is key. With a standard flat head and 82° countersink angle, these screws provide a secure, flush fit that maintains structural integrity and aesthetics in machinery, enclosures, and metal fabrications. Ideal for heavy-duty industrial applications, they deliver reliable performance where vibration resistance and long-term holding power are essential.

Specification Summary & Compliance

These screws adhere to UNC coarse thread standards with precise dimensional accuracy, including a thread size of 5/16"-18 and full threading for consistent engagement. The manufacturing follows industry specifications for thread cutting tapping screws (Type F), ensuring compatibility with recommended 0.29" drill bits and 82° countersink angles. Compliant with common industrial standards for materials and finishes, these fasteners meet general requirements for quality and performance in various sectors, though specific certifications like RoHS or REACH should be verified per batch for environmental compliance.