01J031 - Walter SST+ #31 Cobalt Stub Drill Bit for Sheet Metal

High-Performance Rigidity for Precision Drilling

The Walter 01J031 #31 SST Stub Drill is a specialized cutting tool engineered to address the common challenges faced when drilling sheet metal and thin-walled materials. Unlike standard jobber length bits, this stub drill (also known as screw machine length) features a significantly shorter overall length and flute length. This compact geometry drastically increases the torsional rigidity of the bit, minimizing deflection and vibration during operation. For industrial MRO environments where precision and tool longevity are paramount, this design ensures that holes are drilled accurately and efficiently, even under heavy feed pressures.

Constructed from a premium cobalt blend, the SST Stub Drill offers exceptional heat resistance and hardness. This material composition is critical when working with tough alloys like stainless steel, where standard high-speed steel (HSS) bits often fail due to thermal fatigue. The inclusion of cobalt allows the cutting edges to maintain their sharpness longer, reducing the frequency of tool changes and downtime. Furthermore, the bit is finished with a proprietary bronze SST surface treatment. This coating acts as a lubricant, reducing friction between the tool and the workpiece, which facilitates smoother chip evacuation and prevents galling or welding of the material to the bit.

The geometry of the tip is equally advanced, featuring a self-centering split point. This design allows the drill to bite into the material immediately upon contact, eliminating the tendency to "walk" or wander across the surface. This feature removes the necessity for pre-punching center holes, streamlining the workflow in high-volume fabrication settings. Whether utilized in stationary drill presses or portable hand drills, the Walter 01J031 delivers consistent, burr-free performance in mild steel, non-ferrous metals, and stainless steel applications.