01M543 - Walter SST+ 43/64 Inch Cobalt Drill Bit with 1/2 Inch Shank

High-Performance Walter SST+ Prentice Drill Bit (43/64")

The Walter 01M543 43/64" SST+ Prentice Drill is a top-tier cutting tool engineered for industrial professionals who demand precision and durability. Designed to tackle the toughest materials, this drill bit features a specialized cobalt blend construction that provides exceptional resistance to heat and wear. This makes it the ideal choice for drilling through hard metals such as stainless steel, as well as mild steel and non-ferrous alloys. The robust material composition ensures that the bit maintains its cutting edge longer than standard high-speed steel bits, reducing the frequency of replacements and re-sharpening.

One of the standout features of this model is its "Prentice" style shank. While the cutting diameter is a substantial 43/64 inches, the shank is reduced to 1/2 inch, allowing it to fit into standard drill chucks found on portable power drills, drill presses, and magnetic base units. To address the common issue of bit slippage during heavy-torque applications, the shank is machined with three flats. This tri-flat design locks the bit securely into the chuck, ensuring positive drive and maximum power transmission.

Efficiency is at the core of the SST+ design. The exclusive point geometry is self-centering, which effectively eliminates the need for pre-drilling pilot holes or using a center punch. This allows operators to start drilling immediately with accuracy, saving valuable time on the job site. Furthermore, the bit is finished with a special bronze SST surface treatment. This coating not only enhances the tool's hardness but also reduces friction, facilitating smoother drilling and better chip evacuation. Whether you are working in a fabrication shop or on a maintenance crew, the Walter 01M543 delivers reliable, high-speed performance for large diameter holes.