Alvord Polk 03023 Solid Pilot Counterbore 0.604 in Hss

Product Description

The ALVORD POLK 03023 is a solid pilot counterbore designed for precision spot-facing and counterboring operations in metalworking and machining applications. Built from high speed steel (HSS) with a bright, uncoated finish, this tool delivers consistent cutting performance in a range of ferrous and non-ferrous materials. Key dimensions include a counterbore diameter of 0.604 inches, an oversize pilot diameter of 0.406 inches, a straight cylindrical shank diameter of 0.500 inches, and an overall length of 6.5 inches. Cutting direction is forward, making it compatible with standard right-hand drill press and milling machine setups. Machinists and tool-room technicians are the primary installers of this tool.

This counterbore is sized to create properly dimensioned recesses for 3/8-inch socket-head cap screws. It is suited for use in job shops, production machining environments, and maintenance repair operations where accurate counterbore depth and diameter are required. The oversize pilot engages existing through-holes to guide the cutter and keep the counterbore concentric with the fastener bore. It is appropriate for use on drill presses, knee mills, and similar spindle-driven equipment where the 0.500-inch shank can be secured in a standard end mill holder or collet chuck.

Key Features

• Counterbore diameter of 0.604 inches sized for 3/8-inch socket-head cap screws
• Oversize pilot diameter of 0.406 inches for improved bore guidance and concentricity
• Straight cylindrical shank at 0.500 inches fits standard holders and collet chucks
• Overall length of 6.5 inches provides reach for deep workpieces or extended setups
• High speed steel construction for durability across common machined materials
• Bright, uncoated finish suitable for use with cutting fluids in general machining
• Forward cutting direction compatible with standard right-hand spindle rotation

Compatibility

Designed as an OEM-style solid pilot counterbore compatible with 3/8-inch socket-head cap screws, fitting machines and holders that accept a 0.500-inch straight cylindrical shank.

Installation Notes

This tool is installed and operated by machinists or tool-room technicians using drill presses, milling machines, or similar spindle-driven equipment. Before mounting, ensure the spindle is fully stopped and the machine is powered down. Secure the straight shank firmly in an appropriate collet, end mill holder, or drill chuck rated for the shank diameter. Use appropriate cutting fluid for the workpiece material to extend tool life and improve surface finish quality.