HT Excavator Telescopic Arm, also go by Telescopic Dipper Arm, is a working device installed on the excavator, usually work with clamshell grab or other grab buckets. It consists of the fixed body and the mobile body that can extend and retract the mobile body through the action of the telescopic cylinders, to achieve a larger excavation radius and a reasonable loading height. This type of working device is called a telescopic arm.
| Machine Tonnage | Extension boom | Extended arm | Bucket capacity | Cylinder(T) |
| 12T | 7100mm | 5900mm | 0.3 | 12 |
| 30T | 10000mm | 8000mm | 0.4 | 12 |
| 45T | 13000mm | 11000mm | 0.6 | 20 |
