Accupro 4500180 Solid Carbide Jobber Drill Bit Letter I

Product Description

The ACCUPRO 4500180 is a solid carbide jobber-length drill bit sized to Letter I (0.2720 inches), designed for high-performance drilling in ferrous and non-ferrous metals. It features a TiAlN (titanium aluminum nitride) coating that increases surface hardness and heat resistance, extending tool life in demanding production environments. The 140-degree split point reduces thrust and improves self-centering on entry. With a 2-flute regular spiral design and R-thinned web, the 4500180 evacuates chips efficiently and supports consistent hole quality. Machinists, tool-and-die professionals, and CNC operators rely on this bit for precision drilling where carbide rigidity and coating performance are required.

The 4500180 is suited for drilling operations in machine shops, manufacturing facilities, and production environments where tight tolerances and clean hole entry matter. Its 5xD flute-to-diameter ratio and coolant-through capability make it a practical choice for through-coolant setups and deep-hole applications. The straight cylindrical shank accepts standard drill chucks and collet holders. Right-hand cutting direction is standard for conventional spindle rotation. This bit is appropriate for use in CNC machining centers, drill presses, and manual milling setups where Letter I hole sizing is required.

Key Features

• Solid carbide construction provides rigidity and wear resistance beyond high-speed steel alternatives
• TiAlN coating increases heat resistance and extends tool life in hard or abrasive materials
• 140-degree proprietary point angle with R-thinned web reduces thrust and improves self-centering
• Coolant-through design supports through-spindle coolant delivery for deep-hole applications
• 5xD flute-to-diameter ratio enables effective chip evacuation in deeper cuts
• Straight cylindrical shank fits standard drill chucks and collet tool holders

Compatibility

Designed as an OEM-style replacement or direct-use solid carbide jobber drill bit for applications requiring a Letter I (0.2720 inch) diameter hole in the 0.2500 to 0.3000 inch drill size range, per ISO specification designation.

Installation Notes

Installation and use of this drill bit should be performed by qualified machinists or CNC operators familiar with carbide tooling. Ensure the spindle is fully stopped and the machine is powered down before loading or removing the bit from the chuck or collet. Use appropriate cutting fluid or through-spindle coolant as required by the workpiece material. Avoid side-loading or bending forces on solid carbide tooling, as carbide is brittle and susceptible to fracture under lateral stress.