01J036 - Walter SST Cobalt Stub Drill Bit #36 - Heavy Duty Sheet Metal Bit

Precision Engineering for Tough Materials

The Walter 01J036 SST Stub Drill Bit is a high-performance cutting tool engineered specifically for the demands of industrial metalworking. Sized at wire gauge #36 (0.1065 inches), this bit represents the pinnacle of drilling technology for sheet metal and thin-walled applications. The core of its performance lies in its material composition; manufactured from a premium cobalt blend high-speed steel, it offers exceptional heat resistance and hardness compared to standard HSS bits. This allows the tool to maintain its cutting edge even when subjected to the high temperatures generated during the drilling of tensile materials like stainless steel.

Structurally, the bit features a "stub" or screw machine length design. By significantly reducing the overall length and flute length compared to standard jobber bits, Walter has minimized the potential for torsional deflection. This rigidity is critical when drilling into hard surfaces or when using hand-held power tools where stability can be compromised. The reduction in flex ensures that the energy is directed efficiently into the cut, resulting in cleaner, rounder holes and a drastically reduced risk of the bit snapping under load.

Surface tribology is addressed through Walter's proprietary SST bronze surface treatment. This coating serves a dual purpose: it reduces the coefficient of friction between the tool and the workpiece, facilitating smoother chip evacuation, and it acts as a thermal barrier to protect the substrate material. Combined with a 135-degree split point geometry that eliminates the need for center punching, the 01J036 delivers immediate engagement and rapid penetration. It is an indispensable tool for MRO professionals requiring reliability and precision in their drilling operations.