Osg 257-2500 Combo Drill Reamer 1/4 Inch Solid Carbide

Product Description

The OSG 257-2500 is a solid carbide combination drill reamer designed to drill and ream in a single operation, reducing setup time and tool changes in precision machining workflows. With a 1/4 inch reamer diameter and 2.141 inch flute length, this tool delivers tight-tolerance finished holes in one pass. The bright uncoated finish makes it well suited for applications where coating adhesion or thermal properties of the base carbide are preferred. Machinists and tool-and-die professionals working in production or job-shop environments will find this tool effective for achieving reamed hole finishes without a secondary operation.

This combination drill reamer is appropriate for use in CNC machining centers, manual mills, and drill presses where 1/4 inch reamed holes are required. It is intended for precision work in materials where solid carbide tooling provides the necessary rigidity and edge retention. The right-hand cutting direction and cylindrical shank make it compatible with standard ER collet chucks and drill chucks. Typical applications include component manufacturing, fixture building, and close-tolerance hole finishing in metalworking and general machining environments.

Key Features

• Solid carbide construction provides rigidity and edge retention for close-tolerance reaming
• Combination drill-and-ream design completes hole drilling and finishing in one pass
• 1/4 inch reamer diameter with 2.141 inch flute length for controlled chip evacuation
• Bright uncoated finish suitable for applications where base carbide performance is preferred
• Right-hand cutting direction compatible with standard machine spindle setups
• Cylindrical 1/4 inch shank fits standard collet chucks and drill chucks

Compatibility

Designed as a direct-use solid carbide combination drill reamer for standard 1/4 inch reamed hole applications in CNC and manual machining setups using cylindrical shank toolholders.

Installation Notes

This tool should be installed by a qualified machinist familiar with carbide tooling handling. Secure the cylindrical shank in a properly sized collet chuck or drill chuck and verify runout before cutting. Carbide tooling is brittle and should not be subjected to interrupted cuts or side loading beyond intended parameters. Always confirm spindle speed and feed rate are appropriate for the workpiece material before engaging the tool.