01M552 - Walter 13/16" SST+ Cobalt Prentice Drill Bit with 1/2" Shank

Heavy-Duty 13/16" Drilling Solution for Standard Chucks

The Walter 01M552 13/16" SST+ Prentice Drill Bit is an industrial-grade cutting tool designed to bridge the gap between large-diameter hole requirements and standard portable tooling limitations. Known in the industry as a "Prentice" or reduced-shank drill, this bit features a precision-ground 1/2-inch shank that allows it to fit securely into standard hand drills and drill presses that would otherwise be limited to smaller bit sizes. This capability makes it an essential tool for maintenance departments, fabrication shops, and on-site installers who need to drill substantial holes without carrying heavy magnetic drills or specialized machinery.

Durability is at the core of the SST+ line. Manufactured from a premium cobalt blend high-speed steel, this drill bit is engineered to withstand the high temperatures generated when drilling through tough materials like stainless steel and structural alloys. The addition of cobalt significantly extends the cutting life of the tool, allowing for more holes per bit compared to standard black oxide or HSS alternatives. Furthermore, the bit undergoes a specialized Bronze SST surface treatment. This proprietary coating acts as a lubricant and heat deflector, reducing friction during the cut and preventing chips from welding to the flutes, which is a common cause of bit failure in deep hole drilling.

Operational efficiency is further enhanced by the intelligent shank design. Large diameter bits often suffer from "spin-out" inside the chuck when high torque is applied. Walter solves this with three precision-ground flats on the shank, ensuring a positive lock within the chuck jaws. This prevents damage to both the bit and the drill chuck while ensuring maximum torque transmission to the cutting edge. Combined with a self-centering point that eliminates walking, the 01M552 delivers precise, clean holes in mild steel, non-ferrous metals, and stainless steel with minimal operator effort.