01A521 - Walter SST+ 21/64 Inch Cobalt Drill Bit for Stainless Steel

High-Performance Drilling with Walter SST+ Technology

The Walter 01A521 21/64" SST+ Drill Bit represents the pinnacle of drilling efficiency for industrial applications. Designed specifically to address the challenges of drilling tough materials, this bit utilizes an exclusive cobalt blend that significantly enhances hardness and heat resistance. Unlike standard high-speed steel bits that may dull rapidly when facing the work-hardening properties of stainless steel, the SST+ maintains its cutting edge longer, ensuring consistent performance across multiple holes.

Precision engineering is at the core of the SST+ design. The bit features a heavy-duty, fully ground body that provides the structural rigidity necessary for high-torque drilling. Its unique "High Flow" flute geometry is engineered to evacuate chips rapidly; this is critical in preventing heat buildup that can damage both the bit and the workpiece. The addition of a specialized bronze SST surface treatment further aids in performance by reducing friction, allowing for smoother operation and potentially higher drilling speeds without compromising tool life.

Versatility is a key advantage of the 01A521. While it excels in stainless steel, it is equally effective in mild steel and non-ferrous metals. The 135° split point geometry is a standout feature for maintenance and fabrication professionals, as it allows for precise self-centering. This eliminates the need for center punching and prevents the bit from "walking" when starting a hole on curved or round surfaces, such as pipes and tubing. Whether used in a stationary drill press or a portable hand drill, the Walter SST+ delivers reliability and precision.