Hertel S-74148354 Combo Drill Countersink Size 8 Hss

Product Description

The HERTEL S-74148354 is a combination drill and countersink designed to drill a pilot hole and form a countersink recess in a single operation. Built from high-speed steel with a bright, uncoated finish, it handles both drilling and countersinking in one pass, reducing tool changes and setup time. The body diameter measures 3/4 inch, the drill point diameter is 5/16 inch, and the overall length is 3-1/2 inches. The 60-degree included angle suits standard flat-head fastener seating. This tool is used by machinists, fabricators, and maintenance trades working with metal, wood, or composite materials on benchtop drill presses or CNC machines.

This combo drill countersink is suited for production and job-shop environments where consistent countersink geometry is required at size 8. The plain cutting edge style and right-hand cutting direction make it compatible with standard right-hand drill presses and CNC spindles. It is a non-aircraft-style, non-tapered tool intended for general countersinking applications where a pilot hole and seat must be formed simultaneously. The double end type allows the tool to be reversed when one end dulls, extending service life between sharpenings.

Key Features

• Combination drill and countersink completes pilot hole and countersink seat in one pass
• High-speed steel construction provides durability across metal, wood, and composite materials
• 60-degree included angle suits standard flat-head and oval-head fastener seating
• Double end design extends usable tool life by providing two cutting ends
• Right-hand cut compatible with standard drill press and CNC spindle rotation
• Bright, uncoated finish for general-purpose use without specialized coating requirements

Compatibility

Designed as a general-purpose combo drill countersink for use in standard drill press chucks and CNC tool holders accepting a 3/4 inch body diameter shank, suitable for size 8 fastener applications.

Installation Notes

Installation and use should be performed by qualified machinists or trades personnel familiar with rotary cutting tools. Secure the workpiece fully before engaging the tool, and verify spindle speed is appropriate for the material being machined. Inspect the cutting edges before use and do not operate a chipped or dull tool. Eye protection and appropriate chip guards are required during operation.