T6 Series Double Tube Core Barrels

General purpose conventional core barrels designed for coring in soft to hard homogenous and slightly broken formations with water, mud, polymer or air flushing.   Although  designed as double tube core barrels, all can be converted to triple tube by incorporating PVC coreliners. Available in 6 different diameters for metric (millimetre) hole sizes between 101 – 146 mm. Also available is the T6H which produces H size hole.


  • Fast penetration compared with thicker wall core barrels (e.g. DCDMA types WF, WG etc)
  • A general purpose core barrel suitable for soft to hard rock formations.
  • In addition to water and polymer, mud and air can be used for flushing

Technical Data

SpecificationCore Barrel Type
Hole Diameter (mm)76.386.3101.3116.3131.3146.3
Core Diameter (mm)
Kerf / Crown Thickness (mm)9.59.511.011.511.511.5
Cutting Area (cm2)20.2123.2431.5838.3043.7949.28
Hole Area (cm2)45.7358.4980.60106.2135.4168.1
Cutting Area as % of Hole Area44%40%39%36%32%29%
Core Area (cm2)25.5235.2649.0267.9391.61118.8
Standard Thread Connection in Head”CR50CR50NWNWNWNW
Recommended CasingM86M101M116M131M146
Conversion to triple tube possibleYesYesYesYesYesYes

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

Key to Main Parts of T6 Core Barrel Assembly

Complete core barrel consists of:

1. Core Barrel Head

2. Inner Tube 1.5m or 3.0m long

3. Outer Tube 1.5m or 3.0m long

4. Extension Tube (T6-116, T6-131 and T6-146 only)

5. Core Lifter

6. Core lifter Case

Core Bit and Reaming Shell are 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.

Click on this link for the T6H Core Barrel.