Hertel H-81154L04040 Combo Drill Countersink Hss 4 in

Product Description

The HERTEL H-81154L04040 is a combination drill and countersink designed for simultaneous drilling and countersinking in a single pass. Built from high-speed steel with a bright, uncoated finish, this tool features a 5/16 inch body diameter, a 1/8 inch drill point diameter, and a 118-degree drill point angle paired with an 82-degree included countersink angle. At 4 inches overall length, it falls into the long-length category, making it well suited for reaching recessed workpieces. Machinists, tool-and-die workers, and metalworking professionals use this style of tool for deburring, chamfering, and seating flat- or oval-head fasteners flush with a workpiece surface.

This combo drill countersink is intended for countersinking operations in metalworking environments, including job shops, maintenance facilities, and production floors. The double-end style provides two usable cutting ends, extending tool life between replacements. The plain cutting edge style and uncoated high-speed steel construction make it compatible with a wide range of ferrous and non-ferrous materials at standard cutting speeds. It is sold and packaged individually, making it practical for both one-off maintenance tasks and production replenishment.

Key Features

• Combination drill and countersink completes drilling and chamfering in one operation
• High-speed steel construction provides durability across a range of common workpiece materials
• Double-end design offers two cutting ends for extended tool service life
• 118-degree drill point angle suited for general-purpose metalworking applications
• 82-degree included angle matches standard flat-head and oval-head fastener seat geometry
• Long-length designation at 4 inches OAL provides reach for deeper or obstructed setups

Compatibility

Designed as an OEM-style replacement or direct-use combo drill countersink for general metalworking and maintenance applications requiring a size 4, 5/16 inch body diameter countersinking tool.

Installation Notes

This tool is installed in a compatible drill chuck or collet on a drill press, CNC machine, or hand drill. Secure the shank fully and verify chuck or collet runout before use to protect both the tool and the workpiece. Always wear appropriate eye protection and follow shop-specific speeds and feeds guidelines for high-speed steel tooling. Inspect both cutting ends for chipping or wear before each use and replace the tool if either end shows damage.