Hertel 300-003005 Combo Drill Countersink 1/4 in Solid Carbide

Product Description

The HERTEL 300-003005 is a combination drill and countersink designed for simultaneous drilling and countersinking in a single operation. Built from solid carbide, it delivers the hardness and edge retention required for production machining and precision metalworking applications. The tool is Trade Size No. 3 with a 1/4 inch body diameter, a 7/64 inch drill point diameter, and a 90-degree included angle. Overall length is 2 inches. The right-hand cutting direction and plain cutting edge style make it a straightforward drop-in for standard CNC or manual drill press setups. Machinists, tool and die shops, and production floor technicians are the primary users of this tool.

This combo drill countersink is suited for creating countersunk holes for flat-head fasteners in ferrous and non-ferrous metals, plastics, and composite materials where close tolerances are required. The solid carbide construction supports use at higher speeds than high-speed steel alternatives, making it appropriate for production runs and precision fixture work. The double end type extends tool life by providing two usable ends before replacement is needed.

Key Features

• Solid carbide construction for superior hardness and wear resistance
• 90-degree included angle for standard flat-head fastener countersinks
• 7/64 inch drill point diameter and 7/64 inch drill point length for precise pilot hole sizing
• Double end type provides two cutting ends, extending usable tool life
• Right-hand cut with plain cutting edge style for compatibility with standard toolholders
• Compact 2 inch overall length suited for close-clearance and tight-fixture applications

Compatibility

Designed as an OEM-style replacement or direct-use combo drill countersink for Trade Size No. 3 applications requiring a 1/4 inch body diameter and 90-degree countersink angle in standard drill press, CNC, or manual lathe setups.

Installation Notes

This tool is installed by machinists and tool room technicians. Secure the shank firmly in a compatible collet or drill chuck rated for the intended spindle speed before operation. Ensure the workpiece is properly clamped to prevent movement during the combined drilling and countersinking pass. Solid carbide tools are brittle and should not be used with excessive side loading or interrupted cuts that could cause chipping or fracture.