412F Airflush Core Barrel

The 412F airflush core barrel is designed for coring in soft to medium hard rocks using air as the flushing medium. It is often used for open-cast coal exploration and general geotechnical coring in situations where it is not desirable to use air as the flushing medium.

The large annular space between the inner and outer tubes, in combination with face-discharge core bit designs, allows a large volume of air to reach the face of the bit . This is essential for cooling the bit and uplifting rock cuttings from the borehole.

This core barrel has proved to be very effective when used with PCD core bits, giving a fast rate of penetration and good core recovery


  • Optimized for the use of air flush
Technical Data
SpecificationCore Barrel Type
Hole Diameter (mm)107.2
Core Diameter (mm)74.7
Kerf / Crown Thickness (mm)16.25
Cutting Area (cm2)46.5
Hole Area (cm2)90.3
Cutting Area as % of Hole Area51.4%
Core Area (cm2)43.8
Thread Connection in Head*HW
Recommended CasingPW
Conversion to triple tube possibleYes

*Cross-over sub required for drill rods not matching the thread connection in core barrel head

Key to Main Parts of 412F Core Barrel Assembly

Complete core barrel consists of:

1. Core Barrel Head

2.  Inner Tube 1.5m or 3.0m

3. Outer Tube 1.5m or 3.0m

4. Inner Tube Extension

5. Core Lifter

6. Core Lifter Case

Core Bit is not supplied as part of the core barrel assembly, but must be chosen correctly to match the particular application and rock formation. Please refer to our Core Bits page for further details.