01H130 - 15/32 Inch SST Hex Shank Stub Drill Bit for Stainless Steel

Technical Overview of the Walter 01H130 SST Stub Drill

The Walter 01H130 is a high-performance 15/32-inch stub drill bit engineered for precision and durability in industrial environments. Part of Walter's renowned SST+ line, this cutting tool is specifically designed to address the challenges of drilling through tough materials such as stainless steel, mild steel, and non-ferrous metals. The drill features a robust hex shank, which is critical for high-torque applications; unlike round shanks that may slip under load, the hex geometry ensures a positive lock within the drill chuck, maximizing power transmission from the tool to the workpiece.

A defining characteristic of this model is its "stub" or screw machine length. By reducing the overall length and flute length compared to standard jobber bits, the 01H130 achieves significantly higher rigidity. This increased stiffness minimizes deflection and vibration during operation, which is particularly advantageous when drilling into hard alloys or when working in confined spaces where tool length is a constraint. The reduction in flexion also directly correlates to a lower breakage rate, making this a cost-effective solution for high-volume fabrication shops.

The cutting geometry utilizes a 135° split point. This aggressive angle allows the bit to penetrate material immediately upon contact, effectively eliminating the "walking" phenomenon often seen with standard 118° points. Consequently, operators can bypass the pre-drilling or center-punching stage, streamlining the workflow. Furthermore, the bit is treated with a special bronze SST surface coating. This treatment enhances the surface hardness and lubricity of the bit, reducing friction and heat generation—the primary causes of drill failure in work-hardening materials like stainless steel. The result is a tool that maintains its cutting edge longer and produces cleaner, burr-free holes in sheet metal and thin-walled tubing.