S-91775A521 Length 1" 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 installation time and tooling costs.
• Optimized for 0.025" maximum drilling thickness in sheet metal applications, ensuring reliable fastening in thin materials.
• Secure Phillips drive and oval head provides a flush, finished appearance while resisting cam-out during installation.
• Fully threaded shank delivers maximum grip and holding power along the entire fastener length.
• Compliance with RoHS 3 and REACH regulations ensures environmental safety and global market acceptance for your products.
• 82° countersink angle allows for clean, flush seating in prepared holes, improving aesthetics and safety.

Professional Applications & Engineering Value

These No. 4-24 thread forming tapping screws are specifically engineered to address common challenges in sheet metal assembly, where traditional fasteners may strip threads or require additional tapping operations. The black-oxide steel construction provides enhanced corrosion protection, crucial for industrial environments exposed to moisture or varying temperatures. The thread forming A/AB type design displaces material rather than cutting it, creating stronger thread engagement and higher resistance to vibration loosening. This makes them ideal for metalworking applications requiring reliable, permanent fastening in thin gauge materials up to 0.025" thickness, such as HVAC systems, electronic enclosures, and automotive components. The combination of Phillips drive and oval head ensures both installation efficiency and a professional, finished appearance.

Specification Summary & Compliance

This thread forming tapping screw features a No. 4-24 thread size with right-hand thread direction and fully threaded design. Manufactured to precise dimensional standards with Class 2A thread fit for consistent performance. Compatible with No. 44 drill bit (0.086" diameter) for proper hole preparation. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental responsibility and chemical safety in industrial applications.