01C509 - Walter SST+ Letter I Cobalt Drill Bit 0.2720 Inch

High-Performance Drilling with Walter SST+ Letter I Bits

The Walter 01C509 Letter I SST+ Drill Bit represents the pinnacle of drilling technology for industrial maintenance and fabrication. Designed to tackle the toughest materials found in professional workshops, this drill bit features a proprietary cobalt blend that significantly enhances hardness and heat resistance. Unlike standard high-speed steel bits that dull quickly when facing stainless steel or other hard alloys, the SST+ series maintains a sharp cutting edge for longer, ensuring consistent performance throughout its lifespan. The Letter I size corresponds to a diameter of 0.2720 inches, making it a critical tool for specific tapping and clearance hole applications where precision is non-negotiable.

One of the standout features of this drill bit is its exclusive "Speed Tip" design. This self-centering geometry eliminates the common frustration of bit walking, allowing operators to drill precise holes on curved or round surfaces without the need for pre-punching. This feature alone saves valuable time during assembly and repair tasks. Furthermore, the bit is engineered with a "high flow" flute design and a back-tapered body. These structural enhancements facilitate rapid chip evacuation, preventing the buildup of swarf that can cause binding and overheating. The result is a cooler drilling process that protects both the tool and the workpiece.

Durability is further reinforced by the heavy-duty fully ground body and the special bronze SST surface treatment. This treatment acts as a lubricant, reducing friction at the cutting interface and allowing for higher drilling speeds with less feed pressure. Whether used in a stationary drill press or a portable hand drill, the Walter SST+ Letter I bit delivers reliable, round, and burr-free holes. It is the ideal choice for professionals in the MRO sector who demand efficiency and quality in every turn.

Key Applications

• Stainless Steel Fabrication: Optimized to cut through work-hardening grades of stainless steel without burning out.
• General Maintenance: Perfect for drilling mild steel, aluminum, and non-ferrous metals in repair scenarios.
• Portable Drilling: The self-centering tip makes it stable and easy to control in handheld power tools.
• Round Surface Drilling: Grips pipes and curved stock immediately for accurate hole placement.