Osg 1230100 Spiral Point Tap 1/4-20 Unc 2 Flute Bottoming

Product Description

The OSG 1230100 is a spiral point tap designed for threading 1/4-20 UNC holes in production and maintenance environments. Built from high-speed steel with a bright finish, this bottoming-style tap features a 2-flute spiral point geometry that pushes chips forward through the hole during cutting, reducing jamming and enabling cleaner thread formation. The H3 thread limit provides a controlled fit tolerance suited for 3B class-of-fit applications. Overall length is 2.5 inches, with a thread length of approximately 0.638 inches. This tap is installed by machinists, tool-and-die workers, and maintenance mechanics working with tapped hole assemblies across a range of base materials.

The OSG 1230100 is suited for right-hand threading operations in a variety of materials including aluminum, cast aluminum, cast iron, low-carbon steel, medium-carbon steel, high-carbon steel, and hardened steel. The bottoming chamfer allows threads to be cut close to the bottom of a blind hole, making it appropriate for tight-tolerance assemblies where full thread depth near the hole floor is required. It is used in manual tapping setups and compatible CNC or drill press applications where coolant-through is not required.

Key Features

• Spiral point geometry pushes chips ahead of the tap to reduce clogging in through-hole applications
• Bottoming chamfer allows threading to within a few threads of the hole bottom in blind holes
• H3 thread limit provides controlled oversize tolerance for 3B class-of-fit requirements
• High-speed steel construction offers durability across a broad range of workpiece materials
• Right-hand thread direction, no coolant-through requirement, no interrupted thread configuration
• Bright finish with no coating — suitable for use with cutting fluid applied externally

Compatibility

Designed for 1/4-20 UNC tapping applications in aluminum, cast aluminum, cast iron, low-carbon steel, medium-carbon steel, high-carbon steel, and hardened steel workpieces requiring a 3B class of fit.

Installation Notes

This tap should be installed and operated by a qualified machinist or maintenance mechanic familiar with tapping procedures and safe tool handling. Power down or disengage any CNC or drill press spindle before securing the tap in the holder. Apply an appropriate cutting fluid for the workpiece material before beginning the tapping operation. Do not force the tap if resistance increases unexpectedly — back off to clear chips and reapply cutting fluid.