1. QYC Front-end Mono Strand Hydraulic jack has internal re-usable anchor which can automatically clamp and loosen the wedge.
2. Mono jack are mainly used for GYM15 and GYM13- type various single tensioning with bonded and unbonded prestressed cable. 

QYC 27ton hydraulic jack is matched with prestressed anchorage widely used in the construction of bridge and buildings, railway and subway, water conservancy and hydropower engineering.  

1. Using the new seals, to synchronous strengthen the seal-ability under great pressure.
2. Mono jack use for 12.7mm pc strand using special alloy steel with heat treatment process, reducing the cylinder's expansion ratio in the tensioning process. So the life of seals and sealing performance can be improved about 20%.
3. In the tensioning and operating process,, jacks is easily damaged under overpressure because of the jack-based pullback cylinder, so we added the overpressure valve on the jacks to pressure production. Meanwhile we improved the original of commonly used structure by wire disc and flanged disc, to make the bearing capacity for oil pressure strengthen. So enormously reduce the possibility of mechanical damage due to improper operation. 

Parameter table of QYC Front-end Mono Strand Hydraulic jack
Model	Nominal	Diameter of	Area of	Stroke of	Rated oil pressure	Overall dimension		Minimum		The reserved
	tensioning	minimum	stressing	stressing				working		length
		center hole	cylinder					space(mm)		of strand
	KN	mm	mm²	mm	Mpa	out diameter(mm)	length(mm)	L	E	mm
QYC70	74	10	1437	150	50	63	296	616	54	120
QYC240	240	18	4009	200	60	102	425	825	86.7	200
QYC270	270	18	4415	200	61	105	427	827	89	200
QYC1100	1100		22619	200	49	265	336
QYC2000	2000		42332	200	48	355	386