01F513 - Walter SST+ 13/64 Inch Cobalt Extension Drill Bit 6 Inch Length

High-Performance Extension Drilling Solution

The Walter 01F513 13/64" SST+ 6" Extension Drill Bit is a premium cutting tool designed for industrial professionals who demand precision, durability, and extended reach. Part of the renowned SST+ series, this drill bit is engineered using a proprietary cobalt blend that significantly enhances heat resistance and hardness. This material composition is critical when drilling through tough, high-tensile materials such as stainless steel, where standard high-speed steel bits often fail due to excessive heat buildup and edge degradation. The 6-inch overall length provides the necessary reach for drilling deep holes or accessing recessed components within complex machinery and fabrication assemblies.

Technically, the bit features a heavy-duty fully ground body which ensures tight tolerances and superior concentricity. This manufacturing process results in a tool that runs true, reducing vibration and wear on both the bit and the drilling machine. The geometry of the tip is a 135° split point, a feature that eliminates the need for center punching. This self-centering design bites into the material immediately upon contact, preventing the "walking" phenomenon often experienced with standard 118° points, especially on curved or round surfaces like pipes and tubing. This precision saves time and reduces the risk of marring the workpiece surface.

Furthermore, the Walter 01F513 is treated with a special Bronze SST surface coating. This treatment is not merely cosmetic; it serves a functional purpose by reducing the coefficient of friction between the tool and the workpiece. Lower friction means less heat generation and smoother chip evacuation, which are vital for maintaining the temper of the bit during prolonged drilling operations. The quick-flow flute design works in tandem with the surface treatment to eject chips rapidly, preventing clogging and binding deep inside the hole. Whether utilized in a stationary drill press for repetitive production work or a portable hand drill for maintenance and repair, this extension bit delivers consistent, high-quality results across a wide range of ferrous and non-ferrous metals.