01M560 - Walter SST+ 15/16" Prentice Drill Bit with 1/2" Reduced Shank

Heavy-Duty Industrial Drilling Precision

The Walter 01M560 15/16" SST+ Prentice Drill is an elite cutting tool engineered for the rigorous demands of industrial maintenance, repair, and operations (MRO). Part of the renowned SST+ series, this drill bit is manufactured from a proprietary cobalt blend high-speed steel (HSS). This metallurgical composition provides exceptional hot hardness, allowing the bit to maintain its cutting edge even when subjected to the high temperatures generated during heavy-duty drilling applications. It is specifically designed to tackle tough materials, including stainless steel, mild steel, and various non-ferrous alloys, making it a versatile asset in any machine shop or fabrication facility.

One of the defining technical features of this tool is its "Prentice" style design, commonly referred to as a Silver & Deming bit. While the cutting diameter is a substantial 15/16 inches, the shank is reduced to 1/2 inch, enabling use in a wide range of portable power drills, drill presses, and magnetic base drills that have a standard 1/2-inch chuck capacity. To address the common issue of shank slippage under high torque loads, Walter has integrated three precision-ground flats onto the shank. These flats ensure a positive lock within the chuck jaws, maximizing power transmission from the drive unit to the cutting edge.

Efficiency is further enhanced by the bit's exclusive point geometry and surface treatment. The self-centering point design prevents the bit from "walking" on the workpiece surface, effectively eliminating the need for center punching or pre-drilling pilot holes. This significantly reduces cycle times in production environments. Additionally, the special bronze SST surface treatment acts to reduce the coefficient of friction between the tool and the workpiece, facilitating smoother chip flow and reducing heat buildup. For MRO professionals seeking reliability and extended tool life in large-diameter drilling, the 01M560 offers a superior solution.