Accupro 63309587 Carbide Jobber Drill Bit Letter I Altin

Product Description

The ACCUPRO 63309587 is a solid carbide jobber-length drill bit sized to Letter I (0.2720 inches) with a 140-degree notched point and an AlTiN (aluminum titanium nitride) coating. Designed for high-performance drilling in demanding shop and field environments, it features a right-hand spiral flute, web-thinned geometry, and a straight-cylindrical shank measuring 5/16 inches in diameter. The overall length is 3 inches with a flute length of 1.36 inches and a maximum drilling depth of 1.09 inches. This bit is intended for use by machinists and metalworking professionals requiring tight tolerances and extended tool life in hard or abrasive materials.

This drill bit is suited for production drilling, tool rooms, and job-shop applications where solid carbide outperforms high-speed steel. The AlTiN coating provides oxidation resistance and reduced friction at elevated cutting temperatures, making it appropriate for dry or minimal-lubrication drilling in hardened steels, stainless steel, cast iron, and similar ferrous alloys. Its 4xD flute-to-diameter ratio supports effective chip evacuation in moderate-depth holes. The parallel web configuration with web thinning reduces thrust at entry and improves centering on machined surfaces.

Key Features

• Solid carbide construction for rigidity and wear resistance in hard materials
• AlTiN coating for heat resistance and extended tool life in dry or near-dry cutting
• 140-degree notched point reduces thrust and improves self-centering
• Web-thinned, parallel web design lowers entry force and chip packing
• Right-hand regular spiral flute with 4xD ratio for consistent chip evacuation
• Straight-cylindrical 5/16-inch shank fits standard drill chucks and collets

Compatibility

Designed as a high-performance replacement or stock drill bit for Letter I diameter applications; fits any standard drill chuck or collet accepting a 5/16-inch straight-cylindrical shank.

Installation Notes

Installation and use should be performed by a qualified machinist or metalworking professional. Secure the shank fully in a properly sized collet or drill chuck before operation, and verify runout is within acceptable tolerance for the application. Follow machine tool manufacturer guidelines for spindle speed and feed rate when drilling with solid carbide tooling. Solid carbide is brittle compared to high-speed steel — avoid side loading, interrupted cuts without appropriate parameters, or dropping the bit on hard surfaces.