Hertel H-81185040400 Combo Drill Countersink Hss 4 in

Product Description

The HERTEL H-81185040400 is a combination drill and countersink designed for creating pilot holes and countersunk seats in a single operation. Built from high-speed steel with a bright, uncoated finish, this tool handles a wide range of metalworking and general fabrication tasks without requiring a tool change between drilling and countersinking steps. The body measures 5/16 inch in diameter, the drill point diameter is 1/8 inch, and the overall length is 4 inches, placing it in the long-length tool category. The 118-degree drill point angle and 60-degree included angle are standard configurations suited to most common countersinking applications on ferrous and non-ferrous materials.

This combo drill countersink is used in machine shop, maintenance, and production environments where preparing holes for flat-head fasteners is a routine task. It is appropriate for use in drill presses, CNC mills, and hand-held power tools with adequate chuck capacity. The plain cutting edge style and double end type make it a practical choice for both one-off repairs and repetitive countersinking work on sheet metal, structural steel, and similar materials. It is not configured for aircraft-style applications.

Key Features

• High-speed steel construction for durability across ferrous and non-ferrous materials
• Bright, uncoated finish for general-purpose countersinking without added coating cost
• 118-degree drill point angle with 60-degree included countersink angle
• Double-end configuration extends usable tool life
• Long-length design at 4 inches OAL provides reach in deeper setups
• Plain cutting edge style suits standard countersinking without chip-breaking geometry

Compatibility

Designed as a standard combo drill countersink for use in drill presses, CNC machining centers, and hand-held rotary tools with a chuck capable of accepting a 5/16-inch body diameter tool.

Installation Notes

Installation is performed by machinists, maintenance technicians, and fabricators using conventional drill chucks or collet systems. Secure the tool firmly in the chuck and verify runout before operation to prevent premature wear. Use appropriate cutting fluid for the workpiece material and set spindle speed per the material and tool diameter recommendations. Inspect the tool for wear or chipping before each use and replace if the cutting edges show damage.