05A615 - Walter SST Corecut 15/16-Inch x 3-Inch Annular Cutter

High-Performance Metallurgy for Precision Drilling

The Walter 15/16" x 3" SST Corecut Annular Cutter (SKU: 05A615) represents a significant advancement in hole-making technology for industrial fabrication. Engineered by Walter Surface Technologies, this cutter is designed to address the common metallurgical challenges associated with drilling large diameter holes in tough alloys. The defining feature of this tool is its Super Speed Tip (SST) technology, which involves a specialized bronze surface treatment. Unlike standard high-speed steel cutters, the SST coating drastically reduces the coefficient of friction between the tool and the workpiece. This reduction in friction is critical when drilling deep holes (up to 3 inches), as it minimizes heat generation—the primary cause of work hardening in stainless steel and premature tool failure.

Structurally, the cutter features fully ground, extra-large flutes that follow a specific spiral geometry. This design is not merely aesthetic; it serves a vital hydrodynamic function by accelerating the evacuation of metal chips and swarf from the cutting zone. Efficient chip removal is essential to prevent binding and to maintain the integrity of the hole's internal surface finish. The result is a hole that is virtually free of porosity and burrs, often eliminating the need for secondary reaming or deburring operations.

The 05A615 is manufactured with a universal shank, ensuring compatibility with a broad spectrum of magnetic drilling units, including those utilizing Weldon or Nitto style arbors. The cutter geometry is optimized for stability, reducing runout and ensuring that the 15/16" diameter is maintained within tight tolerances throughout the drilling process. Whether applied to structural steel, aluminum, or difficult-to-machine stainless steel grades, the SST Corecut delivers consistent, measurable performance improvements in industrial environments.