S-90086A637 1/4"-20 x 2 1/4" ASME B18.6.3, SAE J933 Tapping Screws

Key Features & Benefits at a Glance

• Superior thread cutting performance in aluminum, brass, cast iron, and sheet metal without pre-tapping, reducing installation time and labor costs.
• Enhanced corrosion resistance with zinc-plated steel construction, ensuring long-term durability in demanding industrial environments.
• Secure and flush mounting achieved with the standard 82° flat head profile and countersink angle, providing a smooth finish and preventing snagging.
• Efficient drive engagement via the Phillips No. 3 drive, minimizing cam-out and allowing for high-torque application with common tools.
• Reliable coarse UNC threading (1/4"-20) offers excellent holding power and quick assembly in a wide range of materials.
• Full threading along the 2 1/4" length ensures maximum grip and uniform stress distribution for stronger, more secure fastening.
• Compliance with ASME B18.6.3 and RoHS 3 guarantees consistent quality, safety, and environmental standards for professional use.

Professional Applications & Engineering Value

These Type F tapping screws are engineered to address common challenges in metalworking and assembly, such as stripping threads and time-consuming pre-tapping. The thread-cutting design and zinc-plated steel material work together to create durable, self-forming threads in aluminum, brass, cast iron, and sheet metal, reducing the need for separate tapping operations and minimizing component failure. The flat head with an 82° countersink ensures a seamless fit, while the Phillips drive provides reliable torque transfer. Ideal for construction, automotive, and industrial equipment, these screws enhance assembly efficiency and structural integrity in demanding applications.

Specification Summary & Compliance

This product features a 1/4"-20 UNC coarse thread with right-hand direction and full threading, adhering to standard dimensional tolerances. It complies with ASME B18.6.3 specifications (referencing SAE J933) for consistent performance and safety. Additionally, it is RoHS 3 (2015/863/EU) compliant, ensuring it meets environmental regulations for hazardous substance restrictions. The screw is designed for use with a No. 1 drill bit (0.228" diameter) and standard 82° countersink angles, supporting precise and reliable installations.