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One of the most important parts of a HYDRAULIC HAMMER is the PISTON. Accuracy in size and dimensions is very important in the PISTON The permissible clearance between the PISTON and the cylinder is between 0.07 and 0.13 depending on the type of HYDRAULIC HAMMER (hydraulic-gas or full hydraulic). The power of the HYDRAULIC HAMMER enters the TOOL (CHISEL) through the PISTON, so the PISTON must have high strength and resistance against impact.