S-90087A838 2-56 x 5/16" ASME B18.6.3, SAE J933 Tapping Screws

Key Features & Benefits at a Glance

• Self-tapping design eliminates the need for pre-threaded holes, reducing installation time and labor costs in aluminum, brass, cast iron, and sheet metal.
• Zinc-plated steel construction provides excellent corrosion resistance, ensuring long-term durability and reliability in demanding industrial environments.
• Coarse UNC threads offer superior holding power and faster installation compared to fine threads, ideal for softer materials.
• Phillips No. 1 drive ensures a secure fit with common tools, minimizing cam-out and enhancing driving efficiency.
• Fully threaded shank maximizes grip and load distribution along the entire fastener length for a more secure and vibration-resistant connection.
• Pan head with standard rounded profile provides a low-profile, finished appearance while offering a good bearing surface.
• Manufactured to ASME B18.6.3 and SAE J933 specifications guarantees consistent quality, dimensional accuracy, and interchangeability for professional applications.

Professional Applications & Engineering Value

These Type F thread cutting screws are engineered to solve critical fastening challenges in metalworking and assembly. The zinc-plated steel material resists rust, extending the service life of components in humid or corrosive conditions. The thread cutting action forms precise mating threads in aluminum, brass, cast iron, and sheet metal, creating strong, reliable fastenings without the risk of stripping. This design is particularly valuable in high-volume production and maintenance, where speed and joint integrity are paramount. The combination of a coarse UNC thread and blunt tip ensures easy starting and reduces the potential for material cracking, making these tapping screws a trusted solution for durable mechanical assemblies.

Specification Summary & Compliance

This screw features a 2-56 UNC coarse thread with a Class 2A fit, ensuring reliable engagement and interchangeability. The zinc plating offers a protective finish, while the dimensions, including a head diameter of 0.167" and a length of 5/16", adhere to strict manufacturing tolerances. It is designed for use with a No. 48 drill bit (0.076" diameter) for optimal performance. This product is manufactured in compliance with ASME B18.6.3 and SAE J933 standards, confirming its suitability for professional and industrial applications that demand verified quality and performance.