The Harjak sliding wedge system is a wedge-type mechanical jack of compact size but high load capacity. The smaller models of the jack can be operated manually by hand-spanner or standard torque wrench to provide controlled loads of up to 30 to 35 tonnes. By using a standard torque multiplier, even the largest models can be extended to full load by one operator.
The jack can also be adapted for tensioning by hollow ram hydraulic jack rather than torque wrench if required.
There are three types of Harjak available: STANDARD, BRIDGELIFTER & HI-LIFT