01M536 - Walter SST+ 9/16" Cobalt Prentice Drill Bit with 1/2" Shank

Premium Heavy-Duty Drilling Performance

The Walter 01M536 9/16" SST+ Prentice Drill Bit is an industrial-grade cutting tool engineered for professionals who demand precision and durability. Designed to bridge the gap between large-diameter hole requirements and standard portable tooling, this bit features a reduced 1/2-inch shank that fits universally into standard drill chucks, magnetic drills, and drill presses. This configuration allows operators to drill holes larger than their chuck capacity without requiring specialized heavy machinery.

Manufactured from a premium cobalt blend high-speed steel, the SST+ series is specifically formulated to withstand the high temperatures generated when drilling tough alloys. The addition of cobalt significantly increases the red hardness of the bit, making it the ideal choice for drilling stainless steel, structural steel, and other hard ferrous metals. The tool is finished with Walter's proprietary bronze SST surface treatment, which facilitates chip evacuation and reduces friction, thereby keeping the cutting edge cooler and extending the overall lifespan of the bit.

Operational efficiency is maximized through Walter’s exclusive point geometry. This advanced design creates a self-centering action that bites into the material immediately upon contact, effectively eliminating the need for pre-drilling pilot holes or using a center punch. This feature alone can significantly reduce cycle times in high-volume fabrication environments. Furthermore, the shank is machined with three distinct flats. These flats lock into the jaws of the drill chuck, providing a positive drive that prevents the bit from spinning under high-torque loads—a common failure point in standard round-shank large-diameter bits.

Whether utilized in maintenance, repair, and operations (MRO) or heavy construction, the Walter 01M536 delivers consistent, round holes with minimal burr formation. It is a robust solution for drilling on curved surfaces or in awkward positions where stability and bite are critical.