Hydraulic nuts for upper loads can be set to a precise preload with an accuracy of up to 3% earth; they can be supplied with a stroke indicator that allows the amount of tension to be observed, measured and controlled during operation.

SL-HN series top load hydraulic nuts are especially suitable for tightening in narrow spaces and heavy duty vibrating machinery, and can be assembled with several bolts at the same time. The torque-free design avoids friction, bolt twisting and other factors affecting bolt preload, and the tightened bolt is subjected to pure tensile force.

SL-DYQ engineering jack / pipe jacking machine / cylinder

SL DYQ Engineering Hydraulic Jack

It is used for the construction of underground cables, fibre optic cables and water pipes crossing the highway, as well as the professional equipment when the railway, river or other obstacles in the city can’t be excavated in general. The pipe jacking machine produced by our company is suitable for the above occasions. Adopting the straight top method, the pipe jacking machine is placed in the roadside working pit. With a certain pressure, the pipe jacking machine can jack the required pipe directly to the opposite side horizontally under the roadbed. Depending on the pipe diameter, the depth of soil in the pipe is about 10 metres. The diameter of the pipe can be 200-800mm and the length of the pipe can be 50 metres. There are 50-500 tonnes of specifications to choose from, is a small and medium-sized non-excavation project construction unit of the necessary tools.

SL-HS Two-stage Bolt Tensioners

Two-stage Bolt Tensioners is a hydraulic tool mainly used for tightening and removing bolts. It is supplied with a hydraulic source through a hydraulic pump and uses the tensile force generated by the ultra-high pressure oil pump to elongate the bolt within the elastic deformation zone so that the nut can be easily loosened. Bolt tensioners are widely used in a number of fields, including petrochemical, nuclear, wind, hydropower, thermal power, marine, railway, aerospace, mining and heavy machinery.
Tensile force range: 200-6640KN.
Applicable bolts: M20-M160.
Maximum working pressure: 150MPa 1500Bar.

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