01H021 - 21/64 Inch Cobalt Blend Stub Drill Bit for Stainless Steel

Heavy-Duty Drilling for Tough Materials

The Walter 01H021 21/64" SST Stub Drill is an industrial-grade cutting tool engineered for precision and durability in the most demanding environments. Known as a "screw machine" length drill, this bit features a shorter flute and overall length compared to standard jobber drills. This compact design significantly increases the torsional rigidity of the bit, making it highly resistant to breakage, even when high feed pressure is applied. It is the tool of choice for maintenance, repair, and operations (MRO) professionals who frequently encounter hard metals.

One of the standout features of this drill is its 135° split point geometry. Unlike standard 118° points that often wander on the workpiece, the SST split point is self-centering. It bites into the material immediately upon contact, eliminating the need for a pre-drilled pilot hole or center punch. This is particularly advantageous when drilling into rounded surfaces or pipes where bit walking is a common safety hazard and quality issue.

The drill is treated with Walter's proprietary bronze SST surface finish. This treatment helps to dissipate heat and reduce friction during the drilling process, extending the life of the cutting edge. It is specifically formulated to handle high-tensile materials such as stainless steel, mild steel, and non-ferrous metals. Whether used in a stationary drill press or a portable hand drill, the 01H021 delivers consistent, burr-free holes with maximum efficiency.