01U100 - Walter 1-Inch 82-Degree Variable Pitch Countersink Bit

Precision Engineering for Industrial Finishing

The Walter 01U100 1"-82 Deg VP Countersink represents a significant advancement in hole preparation and finishing technology. Designed for the rigorous demands of industrial metalworking, this tool addresses the common challenges associated with countersinking: chatter, poor surface finish, and rapid tool wear. At the core of its performance is the utilization of M2 High-Speed Steel (HSS). This premium material composition provides the thermal stability and hardness necessary to machine tough alloys, including stainless steel and various non-ferrous metals, without losing its cutting edge prematurely.

What truly sets this tool apart is its Variable Pitch (VP) geometry. Traditional countersinks often suffer from harmonic vibrations—or chatter—during operation, which leads to faceted, rough surfaces that require secondary finishing. The Walter VP design strategically alters the spacing between the cutting flutes. This irregularity disrupts the rhythmic vibrations that cause chatter, ensuring the tool cuts smoothly and quietly. The result is a perfectly round, smooth countersink that ensures flush seating for fasteners and a professional aesthetic for exposed holes.

In addition to its geometry, the 01U100 features a specialized surface treatment that reduces friction coefficient. This enhancement facilitates better chip evacuation and minimizes heat generation at the cutting interface, further extending the tool's service life. The precise tip geometry allows for quick self-centering, reducing the "walking" effect often seen when engaging a pre-drilled hole. For industrial operators seeking reliability and precision in deburring, chamfering, and countersinking operations, this Walter tool offers a superior solution that enhances productivity and part quality.

The tool is engineered with a three-flat shank, a critical feature for high-torque applications. This shank design ensures a positive lock within the drill chuck, preventing the tool from spinning or slipping under load. Whether utilized in a stationary drill press or a portable hand drill, the Walter 01U100 delivers consistent, high-tolerance results across a broad range of materials, making it an essential component of any professional machinist's or fabricator's toolkit.