Hertel H-81185045600 Combo Drill Countersink 4-1/2 Hss

Product Description

The HERTEL H-81185045600 is a combination drill and countersink designed for simultaneous drilling and countersinking in a single operation. Built from high-speed steel with a bright, uncoated finish, this tool features a 3/8-inch body diameter, a 9/64-inch drill point diameter, and a 118-degree drill point angle. The 60-degree included angle is suited for standard countersink work on fastener seats. With a 6-inch overall length, it falls into the long-length tool category, providing reach in deeper fixture setups. Machinists, tool and die workers, and fabrication professionals use this tool in drill press and CNC applications where consistent countersink geometry is required.

This combo drill countersink is intended for countersinking applications on ferrous and non-ferrous materials in production machining, fabrication shops, and maintenance environments. The plain cutting edge style and double end type make it a straightforward choice for standard countersink prep work on bolt and screw clearance holes. It is not an aircraft-style tool and is not tapered, making it appropriate for conventional general-purpose countersinking tasks. The size 4-1/2 trade designation aligns with standard countersink sizing conventions used across machining catalogs.

Key Features

• High-speed steel construction for durability across a range of workpiece materials
• 118-degree drill point angle for standard center-starting performance
• 60-degree included angle for typical flat-head fastener countersink profiles
• 6-inch overall length provides extended reach for deeper or obstructed setups
• Bright uncoated finish — no thermal barrier coating, suitable for use with cutting fluids
• Double end type extends usable tool life before replacement

Compatibility

Designed as a standard-shank combination drill countersink for use in drill presses, lathes, and compatible CNC holders accepting a 3/8-inch body diameter tool.

Installation Notes

Installation and use should be performed by qualified machinists or tooling professionals familiar with rotating cutting tool safety. Secure the tool firmly in the appropriate collet or chuck and verify runout before operation. Always power down and lock out the machine before changing tooling. Use appropriate cutting fluid or coolant for the workpiece material to maintain edge life and surface finish quality.