S-90087A847 4-40 x 1 1/4" ASME B18.6.3, SAE J933 Tapping Screws

Key Features & Benefits at a Glance

• Self-tapping design eliminates the need for pre-tapped holes, reducing installation time and labor costs in aluminum, brass, cast iron, and sheet metal applications.
• Zinc-plated steel construction provides excellent corrosion resistance, ensuring long-term durability and reliability in various industrial environments.
• Coarse UNC threading offers faster installation and superior holding power in softer materials, minimizing the risk of stripping.
• Phillips No. 1 drive ensures common tool compatibility and secure, cam-out resistant driving for consistent fastening.
• Fully threaded 1-1/4" length maximizes grip range and provides uniform clamping force along the entire fastener engagement.
• Pan head with standard rounded profile offers a low-profile finish and larger bearing surface for secure fastening without sinking.
• Compliance with ASME B18.6.3/SAE J933 standards guarantees consistent quality, dimensional accuracy, and reliable performance in demanding applications.

Professional Applications & Engineering Value

These 4-40 UNC thread cutting tapping screws are engineered to solve critical fastening challenges in metalworking and assembly. The thread cutting design (Type F) and blunt tip allow the screw to form its own mating thread in ductile materials like aluminum, brass, cast iron, and sheet metal, eliminating the need for costly tapping operations and reducing assembly steps. Made from robust zinc-plated steel, they resist corrosion in industrial settings, while the coarse thread spacing ensures rapid installation and high resistance to vibrational loosening. The Phillips drive provides widespread tool compatibility, making them ideal for high-volume production lines where efficiency and reliability are paramount. These screws deliver consistent performance in electrical enclosures, machinery panels, and automotive components where strong, permanent threads are required in untapped holes.

Specification Summary & Compliance

This fastener features a No. 4 screw size with 4-40 UNC coarse threads, a thread diameter of 0.112", and a length of 1-1/4". It has a Class 2A thread fit per UNC standards and meets the dimensional and mechanical requirements of ASME B18.6.3 and SAE J933. The screw is fully threaded and designed for use with a No. 41 drill bit (0.096" diameter). The zinc-plated steel material and manufacturing process comply with industry standards for quality and performance.