01K101 - Walter SST #1 Cobalt Double-Ended Stub Drill Bit

Precision Drilling with Walter SST Double-End Stub Drills

The Walter #1 SST Double-End Stub Drill Bit (SKU: 01K101) represents the pinnacle of drilling efficiency for industrial applications. Designed to meet the rigorous demands of the aeronautical, automotive, and metal fabrication industries, this tool is engineered from a specialized cobalt blend. This advanced material composition provides superior hardness and heat resistance compared to standard high-speed steel, making it an ideal choice for drilling through high-tensile materials such as stainless steel and heavy-gauge sheet metal.

One of the defining characteristics of this drill bit is its stub length geometry. Unlike jobber length drills, the shorter flute and overall length of the stub drill significantly increase torsional rigidity. This reduction in length minimizes the potential for flexing under load, thereby drastically reducing the incidence of bit breakage—a common issue when drilling hard metals or working in confined spaces. The increased rigidity also translates to greater hole accuracy and improved surface finish, ensuring that every bore meets strict tolerance requirements.

Efficiency is further enhanced by the double-ended design. By incorporating cutting geometry on both ends of the bit, Walter effectively provides two tools in one. When one end eventually dulls after extensive use, the operator can simply flip the bit in the chuck and continue working immediately, reducing downtime and lowering consumable costs. The 135-degree split point geometry ensures the bit centers itself immediately upon contact with the workpiece, eliminating the need for center punching and preventing the bit from "walking" across the surface. This feature is particularly critical when working on curved surfaces or polished sheet metal where surface marring must be avoided.

Whether utilized in a hand drill or a stationary drill press, the Walter 01K101 delivers consistent, high-performance results. Its silver-plated finish not only aids in identification but also contributes to reduced friction during the drilling process. For MRO professionals and fabricators seeking a reliable, long-lasting drilling solution for #1 size holes (0.2280 inches), the Walter SST Double-End Stub Drill is the superior choice.