Folding type hatch covers are designed according to specific requirements of customers concerning opening size, container arrangement, loading criteria and etc. Especially long-life cylinders which are made of a stainless steel sleeve with 40 ~ 60 micron of hard chrome plating are installed. Single or multiple panel versions are also available. The single folding hatch cover is operated by hydraulic cylinder with faultless and safe movement. Operation of hatch cover is non-sequential/partial with the easy access of hydraulic systems. Manual or automatic cleating system secures the panels when closed. Weather-tightness of hatch cover is kept with sealing system.