01H121 - Walter SST+ 21/64 Inch Hex Shank Stub Drill Bit for Sheet Metal

Precision Drilling for Confined Spaces and Thin Materials

The Walter 01H121 21/64" Hex SST+ Stub Drill is a specialized cutting tool engineered to solve the common frustrations associated with drilling thin-walled materials and working in tight quarters. Unlike standard jobber-length bits, this stub drill features a significantly shorter flute and overall length. This compact design inherently increases the torsional strength of the bit, making it exceptionally resistant to snapping or bending under pressure. For industrial maintenance professionals and machinists, this means fewer broken bits and less downtime, especially when applying the force needed to penetrate tough alloys.

At the tip, the drill utilizes a sophisticated 135° split point geometry. This aggressive angle allows the bit to bite into the material immediately upon contact, effectively eliminating the "walking" or skating phenomenon often seen with standard 118° points. This self-centering capability removes the necessity for pre-punching center marks, streamlining your workflow and ensuring high-precision hole placement. The geometry is specifically optimized for sheet metal and thin-gauge steel, cutting clean, round holes without tearing the material or leaving excessive burrs that require secondary finishing operations.

One of the standout features of this model is its quick-change Hex shank. This design choice allows the drill bit to be used not only in standard three-jaw drill chucks but also in impact drivers and quick-release adapters. This versatility is crucial for technicians who need to swap between drilling and driving operations rapidly. Furthermore, the bit is treated with Walter's exclusive Bronze SST surface treatment. This specialized coating reduces friction between the tool and the workpiece, facilitating smoother chip evacuation and minimizing heat buildup—the primary enemy of cutting tool life. Whether you are drilling into stainless steel, mild steel, or non-ferrous metals, the Walter 01H121 delivers consistent, high-performance results.