Hertel H-81154L03040 Combo Drill Countersink Size 3

Product Description

The HERTEL H-81154L03040 is a combination drill and countersink designed for precision hole-starting and countersinking in a single operation. Built from high-speed steel with a bright, uncoated finish, this tool features a 1/4-inch body diameter and a 7/64-inch drill point diameter. The 82-degree included angle and 118-degree drill point angle make it suited for standard countersink work on ferrous and non-ferrous materials. At 4 inches overall length, it falls in the long-length category, giving extra reach in deeper fixtures or multi-part setups. A plain cutting edge style and non-tapered, non-insertable design mean straightforward use in standard drill chucks and CNC tool holders.

This combo drill countersink is used in machine shop, fabrication, and maintenance environments where countersinking is required before fastener seating. The double end type extends tool life by providing two usable ends. Trade size 3 designation aligns with standard screw countersink sizing conventions, making this a common selection for professionals prepping holes for flat-head fasteners in metal workpieces. Machinists, toolmakers, and maintenance technicians working with drills presses, CNC mills, or manual lathes will find this a direct fit for countersinking tasks.

Key Features

• High-speed steel construction for durability across ferrous and non-ferrous materials
• 82-degree included angle for standard flat-head fastener countersink profiles
• 118-degree drill point angle for clean hole entry and accurate positioning
• Double-end design extends usable tool life
• Long-length at 4 inches overall for added reach in deep or complex fixtures
• Bright, uncoated finish suitable for general-purpose cutting applications

Compatibility

Designed as an OEM-style combination drill and countersink for use in standard drill chucks and CNC tool holders accepting a 1/4-inch body diameter shank.

Installation Notes

Installation is performed by machinists or toolroom technicians using standard drill presses, mills, or lathes. Secure the tool in an appropriately sized chuck or collet rated for the 1/4-inch body diameter before operation. Ensure the spindle and workpiece are properly fixtured to prevent walking or deflection at the drill point. Follow shop safety protocols and wear appropriate eye protection whenever operating rotary cutting tools.