cfa coupling hex160 for 400mm cfa auger match CASAGRANDE B175 cfa rig

 cfa  hexagonal joint hex160mm for casagrande cfa auger match casagrande b200 cfa rig Casagrande cfa coupling hex 160mm for 600mm cfa for casagrande b250 cfa rig Tianjin huachang xingye technology co ltd The Casagrande Hex 160 (160mm across flats) is a standard hexagonal coupling system used to connect Continuous Flight Auger (CFA) sections and Full Displacement Piling (FDP) tools. It is widely used across Casagrande's mid-range multi-function drilling rigs. Here is a technical overview of this specific coupling standard: Key Technical Specifications Interface Type: Parallel hexagonal male/female joint with retaining pins and internal O-ring seals for concrete pumping. Size (Across Flats / A/F): $160\text{ mm}$ Torque Capacity: Typically rated for an operating torque capacity up to approximately 115,000 ft-lbs (~155 kNm to 160 kNm). Common Rig Compatibility: Standard for Casagrande lines matching torque outputs in the 120-200 kNm range, such as the B125, B160 XP, B175, and B200 (when running in CFA configuration). Structural Design & Components Male / Female Connection: The parallel design ensures deep, concentric engagement between the flight sections. This precise hex interface minimizes structural "play" or wobble under significant torsional loads, ensuring the straightness of the pile borehole. Hollow Stem (Concrete Passage): It features a large central inner diameter (I.D.) allowing the passage of high-pressure concrete mixes or grout lines during the extraction phase of the CFA piling process. Sealing: Machined groove configurations house heavy-duty O-rings to prevent slurry or water ingress during drilling, and concrete leakage under pressure during pouring. Retaining Mechanism: High-tensile locking pins (typically 3 heavy-duty retaining pins) secure the male and female elements together across the flats to prevent separation during extraction forces.