Osg 1074402 Straight Flute Bottoming Tap 10-32 Unf

Product Description

The OSG 1074402 is a straight flute bottoming tap designed to cut internal threads in blind holes where full thread depth close to the bottom is required. Built from high-speed steel, it produces a 10-32 UNF right-hand thread to a 2B class of fit with an H3 thread limit, making it suitable for precise, close-tolerance threading work. With 2 flutes and a bottoming chamfer, it clears chips efficiently in short-hole applications. The 7/8-inch thread length and 2-3/8-inch overall length fit standard tap handles and machine tool holders used in production and maintenance environments. Machinists, tool-and-die workers, and maintenance technicians are the primary installers.

This tap is suited for threading operations in a wide range of ferrous and non-ferrous materials. Its straight flute geometry makes it effective in through-hole and shallow blind-hole applications where chip evacuation is controlled manually or with cutting fluid. The bottoming chamfer allows threads to be cut nearly to the full depth of a blind bore, which is critical in assembly applications with limited material depth.

Key Features

• Bottoming chamfer for threading to the full depth of blind holes
• High-speed steel construction for durability across a range of workpiece materials
• 2-flute straight design supports chip clearing in short blind and through holes
• 10-32 UNF thread form to 2B class of fit with H3 thread limit for close-tolerance work
• Right-hand thread direction, compatible with standard tap handles and CNC tooling
• 7/8-inch thread length with 2-3/8-inch overall length for compact tool setup

Compatibility

Rated for use in aluminum, cast aluminum, cast iron, high-carbon steel, low-carbon steel, and medium-carbon steel. Compatible with standard straight-shank tap holders and manual tap handles accepting the corresponding shank diameter.

Installation Notes

Always secure the workpiece before tapping and use an appropriate cutting fluid or tapping compound for the material being threaded. Start the tap perpendicular to the work surface to avoid cross-threading and thread damage. Apply steady, even pressure and back off periodically to break chips. Inspect tap condition regularly, as worn or chipped flutes produce out-of-tolerance threads and can cause tap breakage in the hole.