Accupro 4500022 Letter I Solid Carbide Jobber Drill Bit

Product Description

The ACCUPRO 4500022 is a solid carbide jobber-length drill bit sized at Letter I (0.2720 inches) with a 140-degree split point and a TiAlN (titanium aluminum nitride) coating. Designed for cutting hardened materials, it features a slow spiral flute geometry and a UR-thinned web for reduced thrust and improved chip evacuation. The straight cylindrical shank measures 0.375 inches in diameter, and the overall length is 3.375 inches with a flute length of 1.7813 inches. This bit is used by machinists and toolroom professionals who require consistent performance and extended tool life in demanding applications.

This drill bit is suited for production and maintenance machining operations where hardened steels or other difficult workpiece materials are encountered. Its DIN-specification geometry and solid carbide construction make it appropriate for CNC drilling centers and manual machine tools where tight tolerances and controlled chip flow are required. The two-flute slow spiral design improves chip clearing in deep-hole drilling scenarios common in tool and die, aerospace component, and precision fabrication work.

Key Features

• Letter I size (0.2720 inches) solid carbide construction for rigidity and wear resistance
• 140-degree proprietary point angle optimized for hardened material penetration
• TiAlN coating increases surface hardness and thermal resistance during high-speed cutting
• Slow spiral (4xD) flute geometry aids chip evacuation in hard material drilling
• UR-thinned web reduces axial thrust and minimizes workpiece deformation
• DIN-specification straight shank (0.375 inches) compatible with standard drill chucks and collets

Compatibility

Designed for use in CNC machining centers and manual drill presses equipped with standard straight-shank tool holders or collet systems accepting a 0.375-inch shank diameter. Primary workpiece material designation is hardened materials per manufacturer specification.

Installation Notes

Installation and use should be performed by qualified machinists familiar with carbide tooling. Secure the shank fully in a collet or drill chuck rated for the intended spindle speed before operating. Carbide is brittle — avoid side loading, interrupted cuts without proper setup, or dropping the tool on hard surfaces, as chipping or fracture can result. Follow machine tool manufacturer guidelines for spindle speed and feed rate when drilling hardened materials.