S-91775A513 Length 3/8" Tapping Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with Black-Oxide Steel coating, extending service life in demanding industrial environments.
• Efficient thread forming design creates strong, permanent threads in sheet metal without pre-tapping, reducing assembly time and labor costs.
• Secure installation with No. 1 Phillips drive, minimizing cam-out and ensuring consistent torque application.
• Maximum holding power from fully threaded shank, providing reliable fastening across the entire 3/8" length in sheet metal applications.
• Clean aesthetic finish with oval head profile that sits flush with surfaces, ideal for applications where appearance matters.
• Precision compatibility with No. 44 drill bits (0.086" diameter), ensuring proper fit and optimal thread engagement in materials up to 0.025" thickness.
• Environmental compliance meeting RoHS 3 and REACH standards, suitable for regulated industries and global supply chains.

Professional Applications & Engineering Value

These thread forming tapping screws deliver exceptional value in sheet metal fastening applications where vibration resistance and permanent installation are critical. The Black-Oxide Steel construction provides enhanced protection against corrosion in industrial environments, while the A/AB thread forming type creates stronger threads than conventional cutting screws by displacing material rather than removing it. This results in improved fatigue resistance and reduced loosening under dynamic loads. The fully threaded design ensures maximum engagement in thin materials, and the 82° countersink angle allows the oval head to sit flush for both functional and aesthetic requirements. Ideal for HVAC systems, electronic enclosures, and automotive components where reliable metal-to-metal fastening is essential.

Specification Summary & Compliance

This No. 4-24 thread forming screw features precise inch measurements with 24 TPI thread pitch and 0.112" thread diameter. Manufactured to A/AB tapping screw standards with right-hand threading and Class 2A fit tolerances for consistent performance. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material restrictions adherence. The thread forming design eliminates chips and debris, making it suitable for clean manufacturing environments while providing reliable fastening in sheet metal up to 0.025" thickness.