01H011 - Walter 11/64" SST Stub Drill Bit - 135° Split Point

Technical Overview of the Walter SST Stub Drill

The Walter 01H011 is a high-performance 11/64-inch stub drill bit designed for industrial drilling operations requiring precision and durability. Classified as a screw machine length or "stub" drill, this tool features a significantly shorter overall length and flute length compared to standard jobber drills. This structural design minimizes deflection and vibration under load, providing superior rigidity that drastically reduces the likelihood of snapping, especially when drilling through tough alloys or applying high feed pressure.

Engineered with a 135° split point geometry, the bit is self-centering, effectively eliminating the "walking" phenomenon often encountered with standard 118° points. This feature allows for precise hole placement without the prerequisite of center punching, even on curved or round surfaces. The cutting edges are optimized for shearing through materials with high tensile strength, including stainless steel and mild steel.

A key technical specification of this series is the proprietary SST surface treatment. This special bronze oxide coating serves a dual purpose: it reduces the coefficient of friction between the tool and the workpiece, and it facilitates efficient chip evacuation. By mitigating heat generation at the cutting interface, the SST treatment extends the service life of the cutting edges. This drill is particularly effective for thin-walled applications, such as sheet metal fabrication, where minimizing burr formation and maintaining hole roundness are critical.