Hertel H-81185010400 Combo Drill Countersink 1/8 in Hss

Product Description

The HERTEL H-81185010400 is a combination drill and countersink designed to drill a pilot hole and chamfer a seat in a single pass. Made from high speed steel with a bright polished finish, this tool handles both operations without a tool change, reducing setup time on production or repair work. It carries a trade size of 1 and features a 1/8-inch body diameter, a 3/64-inch drill point diameter, and a 118-degree drill point angle. The 60-degree included angle on the countersink portion suits standard flat-head fastener seating. Overall length is 4 inches, and the double end style extends usable tool life. Machinists, tool and die workers, and sheet metal fabricators are the primary users.

This combo drill countersink is suited for countersinking operations in light metalwork, fixture building, and general machining where flat-head screws or rivets require a flush or recessed seat. The plain cutting edge style and non-tapered, non-insertable design make it straightforward to run in a drill press, CNC machine, or hand drill at appropriate speeds. It is not an aircraft-style tool. Its long-length designation at 4 inches overall gives it reach for deeper setups while keeping concentricity manageable with proper workholding.

Key Features

• Combination drill and countersink completes pilot drilling and chamfering in one operation
• High speed steel construction provides durability across a range of ferrous and non-ferrous materials
• Bright polished finish reduces chip adhesion and aids chip evacuation
• 118-degree drill point angle for general-purpose center drilling
• 60-degree included angle matches standard flat-head fastener geometry
• Double end design extends tool life by offering two usable ends

Compatibility

Designed as a general-purpose combo drill countersink for use in drill presses, CNC machining centers, and hand-held power drills where a 1/8-inch body diameter tool with a 60-degree countersink angle is required.

Installation Notes

This tool is installed and operated by machinists or fabricators in machine shop or field fabrication settings. Secure the workpiece in a vise or fixture before operation and ensure the spindle is at an appropriate RPM for the material being drilled. Inspect both cutting ends before use and replace the tool if either end shows chipping or excessive wear. Use cutting fluid when working with harder metals to preserve edge life.