S-90390A119 5/16"-18 x 3/4" Tapping Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with black-phosphate steel construction, ideal for harsh industrial environments.
• Enhanced torque transmission and reduced cam-out thanks to the T40 Torx drive, ensuring secure fastening in high-stress applications.
• Efficient thread cutting action with Type F design, allowing for easy installation in materials like aluminum, brass, and cast iron without pre-tapping.
• Reliable grip and vibration resistance from UNC coarse threading and full threading, minimizing loosening over time.
• Streamlined flush mounting with a standard flat head and 82° countersink angle, providing a smooth finish in sheet metal and other thin materials.
• Wide material compatibility for use in aluminum, brass, cast iron, and sheet metal, reducing inventory needs for diverse projects.
• Precision fit and reduced drill wear with recommended 0.29" drill bit size, ensuring accurate hole preparation and extended tool life.

Professional Applications & Engineering Value

These 5/16"-18 thread cutting screws are engineered to address common fastening challenges in metalworking and fabrication. The black-phosphate steel material offers excellent protection against rust and corrosion, extending service life in demanding conditions like outdoor equipment or humid settings. With a T40 Torx drive, users benefit from higher torque application without stripping, making them ideal for automated assembly lines where consistency is key. The Type F tapping design and UNC coarse threads cut precise mating threads in softer metals such as aluminum and brass, eliminating the need for separate tapping operations and reducing labor costs. Commonly used in sheet metal, cast iron, and general industrial applications, these screws ensure strong, reliable joints that withstand vibrations and dynamic loads, enhancing overall structural integrity.

Specification Summary & Compliance

This screw adheres to standard dimensional tolerances, including UNC coarse threading (5/16"-18) with a right-hand thread direction and fully threaded shank for uniform load distribution. It features a flat head with an 82° countersink angle and is designed for use with a 0.29" drill bit (Size L) for precise hole preparation. Manufactured from black-phosphate coated steel, it meets common industry standards for thread cutting screws (Type F) and is compliant with RoHS and REACH regulations, ensuring safety and environmental responsibility in industrial use.