description referring to the accompanying drawings a hydraulic bumping and jarring tool 10 includes an outer housing 12 and an inner mandrel 14 which are telescopically mounted with respect to one another the outer housing 12 is a generally cylindrical elongated tube having a bore 16 of varying diameter as will be discussed hereinafter positioned centrally within the bore 16 of the outer housing 12 and movable longitudinally therein is the mandrel 14 having a generally elongated cylindrical or tubular configuration the housing 12 and the mandrel 14 may move with respect to one another longitudinally between an open position at which the mandrel 14 is moved partially out from the housing 12 and a closed position at which the mandrel 14 is almost completely within the housing 12 but are prevented from relative rotary motion by the interlocking of the male splines 18 on the mandrel 14 and the female splines 20 on the housing 12 thus torque is transmitted between the outer cylindrical housing 12 and the inner mandrel 14 the housing 12 and the mandrel 14 have an annular space therebetween outer housing 12 has an inwardly projecting annular anvil portion 22 formed by a decreased internal diameter of the bore 16 of the outer housing 12 to produce a shoulder 24 having an axially right angled impact face adapted to engage the impact face of the hammer as will be hereinafter explained shoulder 24 and the hammer impact face comprise a pair of opposed cooperating impact faces used to impart.