01M549 - 49/64 Inch Cobalt Prentice Drill Bit with 1/2 Inch Shank

High-Performance 49/64" Cobalt Drill Bit for Industrial Applications

The Walter 01M549 49/64" SST+ Prentice Drill Bit represents the pinnacle of heavy-duty drilling technology, engineered specifically for maintenance, repair, and operations (MRO) professionals who demand precision and longevity. This drill bit is manufactured from a premium cobalt blend high-speed steel, which provides exceptional hot hardness and wear resistance. This metallurgical composition allows the bit to maintain its cutting edge even when subjected to the high temperatures generated during the drilling of tensile materials such as stainless steel, mild steel, and various non-ferrous alloys.

A key feature of the SST+ series is the exclusive Bronze SST surface treatment. This specialized coating significantly reduces the coefficient of friction between the tool and the workpiece, facilitating smoother cutting action and preventing chip welding. The geometry of the bit is equally advanced, featuring a 135-degree self-centering split point. This design eliminates the phenomenon of "walking" upon contact, thereby removing the necessity for center punching or pilot drilling. This results in a more efficient workflow and greater dimensional accuracy in the finished hole.

Designed for versatility in industrial environments, this "Prentice" style bit (often referred to as Silver & Deming) features a reduced 1/2-inch shank. This allows operators to utilize a large 49/64-inch cutting diameter using standard portable power drills or drill presses with a 1/2-inch chuck capacity. To address the common issue of bit slippage under high torque, Walter has engineered the shank with three precision-ground flats. These flats ensure a positive lock within the chuck jaws, maximizing torque transmission and preventing damage to both the bit shank and the drill chuck. Whether used in a magnetic drill or a hand-held unit, the 01M549 delivers consistent, high-performance results.