01J040 - Walter SST+ #40 Cobalt Stub Drill Bit for Stainless Steel

High-Performance Drilling with Walter SST Stub Drills

The Walter 01J040 #40 SST Stub Drill is a premium cutting tool designed to solve the common frustrations of drilling into hard metals and thin gauge sheets. Manufactured by Walter Surface Technologies, this drill bit is part of the renowned SST series, known for delivering exceptional performance in industrial environments. The core of this bit is crafted from a specialized cobalt blend, which provides superior hardness and heat resistance compared to standard high-speed steel. This material composition allows the bit to maintain its cutting edge even when subjected to the high temperatures generated during aggressive drilling in stainless steel, ensuring a longer service life and fewer tool changes.

One of the standout features of this model is its stub length (also known as screw machine length). By reducing the overall length and flute length, the bit gains significant rigidity. This structural stability is crucial when drilling with hand-held portable drills, where lateral movement often causes standard jobber-length bits to snap. The increased rigidity ensures that the torque is transferred directly to the cutting edge, resulting in cleaner holes and a drastically reduced breakage rate. This makes it an indispensable tool for maintenance, repair, and operations (MRO) professionals who require reliability in the field.

The bit also features a 135° split point geometry. This self-centering tip bites into the material immediately upon contact, eliminating the need for a center punch and preventing the bit from "walking" across the surface of the workpiece. This is particularly beneficial when drilling into curved surfaces like pipes or tubing. Combined with Walter's exclusive bronze SST surface treatment, which reduces friction and facilitates smooth chip flow, this drill bit offers a drilling experience that is both fast and efficient. Whether you are working in HVAC installation, automotive bodywork, or general fabrication, the Walter 01J040 delivers consistent, high-quality results.