01M620 - Walter SST+ 1-1/2 Inch Prentice Drill Bit with 1/2 Inch Shank

Heavy-Duty Large Diameter Drilling Solution

The Walter 01M620 SST+ Prentice Drill Bit is an industrial-grade cutting tool engineered to bridge the gap between large diameter hole requirements and standard tooling capacities. Measuring 1-1/2 inches in diameter, this bit features a precision-machined 1/2-inch reduced shank, allowing it to be utilized in a wide range of equipment including portable power drills, stationary drill presses, and magnetic base drills that are limited to a 1/2-inch chuck capacity. This design versatility makes it an essential inventory item for maintenance departments and fabrication shops that require flexibility without investing in specialized heavy machinery for occasional large holes.

Constructed from a premium cobalt blend, the SST+ Prentice drill offers exceptional hot hardness and wear resistance. This material composition is critical when drilling through tough alloys such as stainless steel, where standard high-speed steel bits often fail due to heat buildup. The bit is finished with a specialized bronze SST surface treatment which further aids in chip flow and friction reduction, extending the tool's service life significantly between sharpenings. The robust design ensures that the cutting edges maintain their integrity even under the high torque loads associated with drilling large diameters.

Operational efficiency is enhanced by the bit's exclusive point geometry. Designed to be self-centering, it eliminates the walking effect common with large bits, thereby removing the necessity for pre-drilling pilot holes. This single-step drilling capability reduces cycle times and operator fatigue. Furthermore, the shank is engineered with three ground flats to ensure a positive lock within the chuck jaws, preventing the bit from spinning or slipping under load—a common safety and performance issue with round-shank large diameter bits.