01F524 - Walter SST+ 3/8-Inch x 6-Inch Cobalt Extension Drill Bit

High-Performance Drilling for Hard-to-Reach Applications

The Walter 01F524 3/8" SST+ 6'' Extension Drill Bit is a premium cutting tool designed for industrial maintenance, repair, and operations (MRO) where standard length bits fall short. Engineered by Walter Surface Technologies, this bit is part of the renowned SST+ line, known for its exceptional durability and cutting speed in tough metals. The core of this tool is its specialized cobalt blend high-speed steel (HSS) substrate. This metallurgy provides superior hot hardness, allowing the bit to maintain its cutting edge even when drilling through work-hardening materials like stainless steel at high temperatures.

One of the defining technical features of this bit is its heavy-duty fully ground body. Unlike roll-forged alternatives, a fully ground bit offers precise concentricity, ensuring that the hole diameter is accurate and the bit rotates true, which is critical when using an extended length tool to prevent wobbling. The 6-inch overall length provides the necessary reach to penetrate recessed bolts, deep structural channels, or multi-layered assemblies that are inaccessible to standard jobber-length bits.

Efficiency is further enhanced by the 135° split point geometry. This design makes the bit self-centering, effectively eliminating the "walking" phenomenon common with 118° points. This allows for immediate penetration upon contact with the workpiece, removing the need for center punching and reducing overall cycle time. The bit is finished with a special bronze SST surface treatment, which acts as a lubricant to reduce friction and heat generation while facilitating smooth chip evacuation. This tool is an essential asset for professionals working with mild steel, non-ferrous metals, and particularly stainless steel grades.