ISO9001-2008 cert. barrel material:ST52,ST45,OR 27SiMn ... machine,forestry machine,etc,middle-duty,2.total length and diameter:978mm*2523.single strock:690mm4.port diameter: ... M20*1.55.pin hole:30mm6.length between trunnion and pin hole:220mm7.seal,see attached pictureinspection: length, ... inspection Piston Hydraulic Cylinder used for machinery and vehicle for Farming,Construction,forestry,engineering