Alvord Polk 33009 Solid Pilot Counterbore 0.272 in

Product Description

The ALVORD POLK 33009 is a solid pilot counterbore designed for precise counterboring operations on materials fastened with 8-32 Fillister-Head screws. It features a 0.272-inch counterbore diameter, a 0.164-inch standard pilot diameter, and a straight-cylindrical 1/4-inch shank for secure tool holder engagement. The 5-inch overall length provides reach in deeper setups. A TiN (titanium nitride) coating improves surface hardness and wear resistance, extending tool life in production and maintenance environments. This tool is installed and used by machinists, maintenance mechanics, and metalworking tradespeople performing precision drilling and fastener-seat preparation on metal workpieces.

This counterbore is sized specifically for 8-32 Fillister-Head screw applications, making it a direct-fit tool for counterboring screw seats in light to medium metalworking tasks. It is suited for manual drill press work, CNC setups, and bench drilling operations in job shops, maintenance facilities, and light manufacturing environments. The standard pilot configuration ensures proper concentricity between the pilot hole and the counterbore seat without requiring an oversize pilot bore.

Key Features

• 0.272-inch counterbore diameter sized for 8-32 Fillister-Head screws
• 0.164-inch standard pilot diameter for accurate seat concentricity
• Straight-cylindrical 1/4-inch shank fits standard drill chucks and tool holders
• 5-inch overall length provides reach for deeper counterboring setups
• TiN coating increases surface hardness and extends cutting tool life
• Forward cutting direction for standard drill press and CNC spindle use

Compatibility

Designed for use with 8-32 Fillister-Head screws. Fits standard drill chucks and tool holders accepting a 1/4-inch straight-cylindrical shank.

Installation Notes

This tool is used by machinists and maintenance mechanics in drill press, hand drill, or CNC milling applications. Secure the workpiece firmly before operation and ensure the pilot hole is properly sized before engaging the counterbore. Follow standard shop safety practices including eye protection and appropriate spindle speeds for the workpiece material. Do not exceed the tool manufacturer's recommended RPM range for the material being cut.