Hertel H-81154L03050 Combo Drill Countersink No. 3

Product Description

The HERTEL H-81154L03050 is a combination drill and countersink designed for drilling and chamfering pilot holes in a single pass. Built from high speed steel with a bright polished finish, this tool accepts a No. 3 trade size with a 1/4 inch body diameter and a 7/64 inch drill point diameter. The 118-degree drill point angle and 82-degree included countersink angle suit standard fastener seating applications. At 5 inches overall length, this is a long-length tool suited for work requiring extended reach. Machinists, fabricators, and tool-and-die tradespeople are the primary users.

This combo drill countersink is used in metalworking and fabrication environments where consistent countersink geometry is required for screw and fastener seating. The plain cutting edge style and double end type allow the tool to be flipped for extended service life before regrinding. It is not an aircraft-style tool and is not tapered, making it a straightforward general-purpose countersinking solution for shop and field use on ferrous and non-ferrous materials.

Key Features

• High speed steel construction for durability across a range of workpiece materials
• Bright polished finish reduces friction and aids chip evacuation
• 118-degree drill point angle for standard center-drilling and piloting
• 82-degree included countersink angle matches common flat-head fastener geometry
• Double end design extends usable tool life
• Long-length body at 5 inches overall for extended-reach applications

Compatibility

Designed as a general-purpose No. 3 combo drill countersink for use in standard drill presses, lathes, and CNC machining centers that accept 1/4 inch body diameter combination drill countersink tooling.

Installation Notes

Installation is performed by machinists and metalworking tradespeople using drill presses, lathes, or milling machines. Secure the tool firmly in the appropriate collet or chuck before operation and verify spindle speed is appropriate for the workpiece material and tool diameter. Power down and lock out the machine before changing or inspecting the tool. Do not use this tool on workpieces without proper workholding to prevent movement during cutting.