1,Type specification complete, the quality is reliable 2,GB/T17396-1998 hydraulic27SiMnGB/T17396-1998Hydraulic supportHydraulic propDia.70-377×4-40 StandardquantityStandardquantityStandardquantity70×4-4.5-5-6-7-8-9-10-12-15-1640146×4.5-6-8-12-14-16-18-20-25-3060245×25-28-30-34-408473×4-4.5-5-6-7-8-9-10-12-1550152×4.5-6-8-12-14-16-18-20-25-3060273×7-9-12-15-18-20-2510076×4-4.5-5-6-7-8-9-10-12- ...