01H120 - Walter 5/16" SST+ Hex Shank Stub Drill Bit for Sheet Metal

Precision Drilling with Maximum Rigidity

The Walter 01H120 5/16" Hex SST Stub Drill is a high-performance cutting tool engineered specifically for industrial environments where precision, durability, and efficiency are paramount. Distinguished by its "stub" or screw machine length, this drill bit offers significantly higher rigidity compared to standard jobber length bits. This structural stiffness minimizes deflection and vibration, making it the superior choice for drilling into thin-walled materials, sheet metal, and rounded surfaces where bit walking is a common failure mode.

At the tip, the bit features a precision-ground 135° split point geometry. Unlike standard 118° points, this aggressive angle allows the drill to bite into the material immediately upon contact, effectively eliminating the need for pre-drilling or center punching. This self-centering capability is critical when working with hard materials like stainless steel, as it reduces the axial thrust required to penetrate the workpiece. The result is a cleaner hole with minimal burr formation on the exit side, reducing secondary finishing operations.

The tool is treated with Walter's proprietary bronze SST surface treatment. This specialized coating enhances the lubricity of the bit, facilitating smoother chip evacuation and reducing heat generation at the cutting edge. Heat is the primary enemy of tool life, particularly when drilling abrasive or work-hardening alloys; the SST treatment significantly extends the service life of the bit under these demanding conditions. Furthermore, the integrated Hex shank provides a secure, positive drive connection with the drill chuck, preventing slippage under high-torque loads and allowing for rapid tool changes in production settings.

Designed for versatility, the Walter SST Stub Drill excels in confined spaces where longer bits cannot fit. Its robust construction resists breakage even under the lateral stresses often encountered in handheld drilling operations. Whether utilized in stationary machinery or portable power tools, this drill bit delivers consistent, professional-grade performance across a wide range of ferrous and non-ferrous metals.