CFA COUPLING HEX190 FOR 600MM CFA AUGER FOR soilmec  sf65  cfa rig for  cfa  pile

cfa  hexagonal joint  xhd5 for  750mm cfa auger for soilmec  sf65  cfa rig for  cfa  pile

Cfa coupling xhd5 for 800mm cfa auger for soilmec  sf65  cfa rig for  cfa  pile

The Soilmec XHD5 (Extra Heavy Duty 5-inch) is a heavy-duty continuous flight auger (CFA) string and coupling system specifically designed for high-torque applications on Soilmec SF and SR-series piling rigs.

Here are the key technical specifications and operational features of the XHD5 coupling and auger system:

1. Coupling Mechanical Design

Connection Type: Quick-coupling hexagonal joint (typically a  hex size for standard XHD5 strings).

Locking Mechanism: Secured using two high-tensile safety pins driven through the hex joint to prevent rotational and axial disconnection during high-torque drilling and rapid extraction phases.

Material Construction: Manufactured using premium high-grade structural steel (often using 35CrMo or equivalent thick-walled tubing) to handle intense torsional shearing and cyclic bending stresses.

2. Internal Dimensions & Concrete Flow

Hollow Stem Inner Diameter:  (). This inner conduit is optimized for delivering concrete or grout down the center of the auger string.

Double-Wall Stem Construction: Unlike standard HD5 models, the XHD5 features a reinforced double-wall central stem. This configuration maintains the internal  clearing needed for unrestricted concrete flow while significantly thickening the structural cross-section to guarantee superior tool strength against bending moments in hard or dense strata.

Bottom Discharge Protection: The lead auger element utilizes a disposable, pressure-blasted end plug or a mechanical flap gate to block soil or water entry during drilling. It is displaced under pressure the moment concreting commences during extraction.

3. Equipment Compatibility

The XHD5 coupling pattern is the industry benchmark for standard mid-to-large range Soilmec rigs operating in dedicated or converted CFA mode, including:

Rig Series: Soilmec SF-55, SF-65, SF-70, and converted SR-series rigs (e.g., SR-65, SR-70, SR-95) running high-torque rotary heads.

Common Applications: Often integrated into auger string diameters ranging from  up to  or more, frequently handling high-wear flighting ( to  thick lead flights) with hard-faced edges for abrasive soils.

Tianjin huachang xingye technology co ltd  cfa coupling made by 35CrMo , use special steel and bear high torque of drill rig , have heat treated process.
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