01M619 - Walter SST+ 1-7/16" Cobalt Prentice Drill Bit with 1/2" Shank

Industrial Grade Precision with Walter SST+ Prentice Drills

The Walter 01M619 1-7/16" SST+ Prentice Drill is a pinnacle of engineering for heavy-duty industrial drilling applications. Designed to bridge the gap between stationary machining capabilities and portable convenience, this tool allows maintenance professionals and fabricators to bore large-diameter holes using standard power tools. The core of its performance lies in the proprietary cobalt blend material, which offers significantly higher heat resistance and hardness compared to standard high-speed steel. This composition is critical when drilling through tough alloys and stainless steel, where heat buildup can rapidly degrade lesser tools.

One of the standout features of the 01M619 is its "Prentice" style design, characterized by a reduced 1/2-inch shank. This strategic design feature enables the use of a 1-7/16" diameter cutting head in standard 1/2" capacity chucks found on most heavy-duty portable drills and drill presses. To address the high torque requirements of driving such a large bit, Walter has engineered the shank with three precision-ground flats. These flats positively engage with the chuck jaws, effectively eliminating the frustration and safety hazard of the bit spinning or slipping under load. This ensures maximum power transfer from the motor to the cutting edge.

Efficiency is further enhanced by Walter's exclusive point geometry. The self-centering tip bites into the material immediately upon contact, preventing the "walking" effect common with large bits and eliminating the time-consuming step of center punching or pre-drilling pilot holes. The bronze SST surface treatment not only identifies the premium quality of the tool but also serves a functional purpose by reducing friction and aiding in smooth chip evacuation. Whether used for enlarging existing holes or creating new ones in structural steel, non-ferrous metals, or stainless steel plates, the Walter 01M619 delivers consistent, precise results with extended intervals between re-sharpening.

For industrial MRO environments where versatility and reliability are non-negotiable, the Walter SST+ Prentice Drill series stands out as a superior choice. It combines the aggressive cutting capability needed for production environments with the durability required for on-site repairs, making it an essential component of any professional tool crib.