01F509 - Walter SST+ 9/64" x 6" Cobalt Extension Drill Bit

Industrial Grade Extension Drilling Solution

The Walter 01F509 9/64" SST+ Extension Drill Bit is a high-performance cutting tool designed for industrial maintenance, repair, and operations (MRO) where standard length bits fall short. Part of the renowned SST+ series, this drill bit is engineered with a specialized cobalt blend that significantly enhances heat resistance and hardness. This material composition allows the bit to maintain its cutting edge even under the high thermal loads generated when drilling through tensile materials like stainless steel and hard alloys.

With an overall length of 6 inches, this extension bit provides the necessary reach for drilling deep holes or accessing recessed fasteners and components within machinery. The heavy-duty fully ground body construction ensures precise concentricity, reducing vibration and the risk of breakage during operation. A key feature of the SST+ line is the exclusive bronze surface treatment, which acts as a lubricant to reduce friction and improve chip flow, further extending the tool's life.

Professionals rely on Walter SST+ bits for their self-centering split point geometry. This design eliminates the need for center punching, as the bit bites into the material immediately upon contact, preventing "walking" even on curved surfaces like pipes or round stock. Whether working with mild steel, non-ferrous metals, or challenging stainless steel grades, the Walter 01F509 delivers consistent, accurate results in demanding industrial environments.