Product Information:

The 25-ton Rear Gripping Jack is a powerful and reliable double-acting hydraulic jack designed for pre-stressing 15.2mm and 18.0mm strands and single-strand rock anchors in underground mining environments. With a 250kN capacity, this jack ensures strong, consistent performance for secure tendon support.

How it works

This jack is engineered for efficiency—automatically gripping and releasing the strand at the start and finish of the pre-stressing process. To achieve proper tensioning, the protruding strand must be at least 450mm long, allowing the rear gripping jaws to engage effectively. Once the tensioning is complete, any excess strand can be trimmed using a cropper.

For secure anchor wedge lock-off, the jack blocks the free movement of the wedges during stressing, ensuring a firm and lasting hold.

Power & Compatibility

The Air Pump or Hand Pump can be used to power the jack. These units come equipped with three-position, four-way valves and can deliver hydraulic oil at pressures up to 50MPa, ensuring smooth and controlled operation.

spesifications

Maximum Capacity: 250kN
Maximum Pressure: 600MPa
Ram Area: 4320mm²
Stroke Length: 125mm
Minimum Strand Projection: 450mm
Weight: 18kg

Built for durability and ease of use, the 25T Rear Gripping Jack is a must-have for underground mining operations that demand precision, safety, and efficiency.