Hertel S-74148321 Combo Drill Countersink No. 5 Hss

Product Description

The HERTEL S-74148321 is a combination drill and countersink designed for creating pilot holes and countersunk seats in a single operation. Made from high-speed steel with a bright, uncoated finish, this tool handles countersinking in metal, wood, and composite materials without a tool change. The No. 5 trade size features a 7/16 inch body diameter, a 3/16 inch drill point diameter, and a 60-degree included angle. Overall length is 2-3/4 inches. Right-hand cutting direction suits standard spindle rotation on drill presses, mills, and hand drills.

This combo drill countersink is suited for production and maintenance applications where flat-head fasteners must sit flush with the workpiece surface. The double-end style extends tool life by providing two usable cutting ends. Plain cutting edge style works across general-purpose countersinking tasks. Typical users include machinists, maintenance technicians, and fabricators working on light- to medium-duty fastener prep in ferrous and non-ferrous materials.

Key Features

• Combination drill and countersink completes pilot hole and seat in one pass
• 60-degree included angle for standard flat-head and oval-head fastener seating
• High-speed steel construction provides good wear resistance across common workpiece materials
• Double-end design offers two cutting ends per tool
• Bright, uncoated finish suitable for general-purpose use without coating-related buildup concerns
• Right-hand cut compatible with standard drill press and CNC spindle rotation

Compatibility

Designed as a general-purpose combo drill countersink for use in standard drill chucks and collets accepting a 7/16 inch body diameter shank, compatible with drill presses, milling machines, and hand-held drills in typical shop and maintenance environments.

Installation Notes

Secure the tool firmly in a drill chuck or collet before operation and verify runout is within acceptable limits to avoid chatter and premature wear. Use appropriate cutting fluid or lubricant when working with ferrous metals to extend tool life and improve finish quality. Power down the machine and allow the spindle to come to a full stop before changing or inspecting the tool. Follow applicable shop safety standards and wear appropriate eye protection during all drilling and countersinking operations.