Hertel H-81155L01040 Combo Drill Countersink 1/8 in Hss

Product Description

The HERTEL H-81155L01040 is a combination drill and countersink tool designed for simultaneous drilling and countersinking operations in a single pass. Built from high-speed steel with a bright, uncoated finish, this tool features a 1/8-inch body diameter, a 118-degree drill point angle, and a 90-degree included angle for countersinking. The double-end design and long-length construction make it a practical choice for machinists and tool-and-die professionals working in production or maintenance environments where efficiency and repeatability matter.

This combo drill countersink is suited for use in metalworking applications where countersinking operations are required ahead of fastener seating. The plain cutting edge style and 90-degree included angle align with standard countersink requirements for common fastener types. With an overall length of 4 inches and a drill point diameter of 3/64 inch, it fits standard drill chucks and is appropriate for light-duty to medium-duty countersinking tasks on ferrous and non-ferrous materials.

Key Features

• High-speed steel construction for durability across a range of workpiece materials
• Double-end design extends tool life by providing two usable cutting ends
• 118-degree drill point angle suits general-purpose drilling into metal
• 90-degree included angle matches standard countersink requirements for common fasteners
• Long-length tool at 4 inches overall for improved reach in deeper setups
• Bright uncoated finish - no additional coating variables that could affect finished hole dimensions

Compatibility

Designed as a direct-fit replacement or standard-stock combo drill countersink for metalworking applications requiring a Trade Size 1, 1/8-inch body diameter tool with a 90-degree countersink angle.

Installation Notes

Installation of this tool is performed by machinists or maintenance technicians using a standard drill press, milling machine, or CNC setup. Secure the shank firmly in a compatible drill chuck before operation. Ensure the workpiece is clamped or fixtured to prevent movement during drilling. Follow applicable shop safety protocols including eye protection and proper spindle speed selection for the workpiece material.