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T6S Series Double Split Tube Core Barrels

The T6S series core barrels are designed for applications such as soil sampling and site investigation in very loose formations. The core barrel is a double tube conventional type but incorporates an aluminium split inner tube making it easy to inspect the core immediately after taking the sample.

A sturdy type of core barrel suitable for mud and air flushing. It is recommended that face discharge core bits be used in order to minimize sample disturbance caused by the flush.

Available in metric (millimetre) hole sizes 101 and 131 mm, with effective length 1.5 metre only


  • Ideal for direct inspection and rapid logging of the sample when coring  loose formations
  • Large annulus between inner and outer tube allows heavy muds or air to be used for flushing

Technical Data

Specification Core Barrel Type
T6S-101 T6S-131
Hole Diameter (mm) 101.3 131.3
Core Diameter (mm) 72.0 100.8
Kerf / Crown Thickness (mm) 14.5 15.0
Cutting Area (cm2) 39.88 55.60
Hole Area (cm2) 80.6 135.4
Cutting Area as % of Hole Area 49.5% 41%
Core Area (cm2) 40.72 79.80
Thread Connection in Head* 2 3/8" API Reg 2 3/8" API Reg
Recommended Casing M116 M146
Conversion to triple tube possible No No

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

Key to Main Parts of T6S Core Barrel Assembly

Complete core barrel consists of:

1. Core Barrel Head

2. Aluminium Split Inner Tube (1.5m only)

3. Outer Tube (1.5m only)

4. Core Lifter Case

5. Core Lifter

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.