01D540 - Walter SST+ 4.00mm Cobalt Drill Bit for Stainless Steel

High-Performance Drilling for Industrial Applications

The Walter 01D540 is a 4.00mm drill bit from the renowned SST+ series, engineered specifically to address the challenges of drilling through tough industrial materials. In MRO and fabrication environments, standard high-speed steel bits often fail prematurely when subjected to the heat and stress of drilling stainless steel or other hard alloys. Walter has addressed this by formulating the SST+ with a specialized cobalt blend. This metallurgical enhancement significantly increases the bit's red hardness, allowing it to maintain a sharp cutting edge even at elevated temperatures generated during aggressive drilling operations.

Beyond the substrate material, the geometry of the 01D540 is designed for efficiency. It features a "High Flow" flute design which is critical for deep hole drilling. Efficient chip evacuation is paramount to preventing heat buildup; by clearing debris rapidly, the bit remains cooler and cuts more freely. Complementing this is the back-tapered body design, which reduces surface contact between the bit and the sidewalls of the hole. This reduction in friction not only lowers the thermal load but also minimizes the risk of the bit binding or snapping inside the workpiece, a common issue in manual drilling operations.

The performance is further enhanced by Walter's exclusive Bronze SST surface treatment. This coating acts as a lubricant, reducing the coefficient of friction at the cutting interface. The result is a drill bit that requires less axial force to penetrate the material, reducing operator fatigue and machine wear. Whether utilized in a stationary drill press for precision components or a portable hand drill for on-site repairs, the Walter 4.00mm SST+ delivers consistent, round holes with superior surface finish. It is an essential consumable for professionals requiring reliability in mild steel, stainless steel, and non-ferrous applications.