Chicago-latrobe 44828 Taper Length Drill Bit 7/16 in Cobalt

Product Description

The CHICAGO-LATROBE 44828 is a Series 520 taper length drill bit built for high-performance drilling in hard and difficult-to-machine materials. Constructed from M42 cobalt high-speed steel with a black oxide finish, the bit measures 7/16 inch (0.4375 inch) in diameter and delivers exceptional heat and wear resistance at the cutting edge. The 135-degree split point promotes self-centering entry without a center punch, reducing walking on hard surfaces. A web-thinned, tapered web configuration improves chip clearance and reduces thrust. This bit is appropriate for use by machinists, maintenance technicians, and fabricators working with challenging base metals.

The 44828 is rated for drilling cast iron, high-tensile steel, Inconel, manganese steel, and titanium - materials that defeat standard HSS tooling. The spiral flute with regular helix and 4-5/8 inch flute length handles deeper cuts common in taper-length applications. The straight cylindrical shank at 0.4375 inch diameter seats in standard drill chucks without adapters. This bit fits production floor, tool room, and field maintenance scenarios where hardness and heat buildup would compromise conventional drill bits.

Key Features

• M42 cobalt HSS construction - resists heat and wear when drilling hard alloys including Inconel and titanium
• 135-degree split point with self-centering geometry - no center punch required
• Web-thinned tapered web - reduces axial thrust and improves chip evacuation
• Black oxide finish - provides mild corrosion resistance and reduces friction at startup
• Right-hand spiral flute, regular helix - compatible with standard drill presses, lathes, and handheld drills
• Straight cylindrical shank - fits conventional drill chucks without reduction sleeves

Compatibility

Designed for use in standard drill chucks accepting a 0.4375 inch straight cylindrical shank. Rated material applications include cast iron, high-tensile steel, Inconel, manganese steel, and titanium as specified by the manufacturer.

Installation Notes

Secure the straight shank firmly in the drill chuck before use and verify chuck key removal prior to powering the spindle. Use appropriate cutting fluid or coolant for the base material to extend tool life, particularly when drilling Inconel or titanium. Inspect the cutting edge for wear or chipping between uses; cobalt bits can be reground but require proper grinding equipment suited for cobalt-grade HSS. Follow applicable shop safety standards and machine-guarding requirements at all times.