Cleveland C46621 Counterbore Pilot 17/32 in Hss

Product Description

The CLEVELAND C46621 is a counterbore pilot designed to guide counterboring tools during precision machining operations. It seats into the pilot hole to center the counterbore cutter and maintain concentricity between the drilled hole and the counterbored seat. The C46621 features a 17/32 inch head diameter and a 1/4 inch shank diameter, making it suited for use with compatible counterbore sets in metalworking applications. Constructed from high-speed steel with a bright, uncoated finish, this pilot delivers adequate hardness and wear resistance for general shop use. Machinists and toolroom technicians install this component when counterboring bolt seat or fastener clearance features in ferrous and non-ferrous materials.

The C46621 is used in machine shop, maintenance, and fabrication environments where accurate counterboring is required. It is appropriate for manual milling, drill press, and CNC operations where fastener seat geometry must be held to close tolerances. The bright finish makes it suitable for a wide range of materials without added coating-related clearance concerns. This pilot is a single-piece component sold individually and is intended for professional machining use.

Key Features

• 17/32 inch head diameter for accurate counterbore centering
• 1/4 inch shank diameter for secure tool holding
• 9/16 inch head length with 2 inch overall length
• High-speed steel construction for hardness and wear resistance
• Bright, uncoated finish suitable for general-purpose metalworking
• Sold as a single unit with no minimum order beyond one piece

Compatibility

Designed as a replacement or spare counterbore pilot for use with counterboring tools requiring a 1/4 inch pilot shank and a 17/32 inch head diameter. Verify pilot head and shank dimensions against your counterbore body specification before installation.

Installation Notes

Installation is performed by qualified machinists or toolroom technicians. Ensure the machine spindle is fully stopped and locked out before inserting or removing the pilot. Confirm that the pilot shank seats fully and securely in the counterbore body before initiating a cut. Inspect the pilot for wear or runout periodically, as a worn pilot will compromise counterbore concentricity.