01M617 - Walter SST+ 1-5/16 Inch Prentice Drill Bit with 1/2 Inch Shank

High-Performance Large Diameter Drilling

The Walter SST+ 1-5/16" Prentice Drill Bit (01M617) is an industrial-grade cutting tool engineered for heavy-duty drilling applications where precision and durability are paramount. Part of Walter's renowned SST+ series, this drill bit is specifically designed to bridge the gap between large-diameter hole requirements and standard portable tooling. By featuring a reduced shank, it allows users to bore 1-5/16" holes using standard drills with a 1/2" chuck capacity, making it an indispensable asset for maintenance, repair, and fabrication workshops.

Advanced Cobalt Construction

Manufactured from a high-quality cobalt blend, the SST+ Prentice drill offers superior heat resistance and hardness compared to standard high-speed steel. This material composition is critical when drilling through tough alloys like stainless steel and other ferrous metals, ensuring the cutting edges remain sharp for longer periods. The bit is finished with a special Bronze SST surface treatment, which significantly reduces friction during operation, promotes smoother chip evacuation, and helps prevent work-hardening of the material.

Precision Geometry for Efficiency

One of the standout features of this drill bit is its exclusive point geometry. Designed to be self-centering, it eliminates the common tendency of large bits to "walk" on the surface, thereby removing the need for center punching or pre-drilling pilot holes. This feature alone drastically reduces cycle times. Furthermore, the shank is machined with three distinct flats, ensuring a positive lock within the drill chuck. This design effectively eliminates slippage, ensuring maximum torque transmission even under heavy loads.

Versatile Application

Ideal for use in portable power drills, drill presses, and magnetic base drills, the Walter 01M617 is versatile enough to handle mild steel, non-ferrous metals, and stainless steel. Whether you are drilling into flat plate or round surfaces like piping, this tool delivers consistent, round, and burr-free holes with exceptional speed.