Lubricant metering device

A lubricant metering device (1), comprising a frame (5) which defines a cup-shaped body (5A) on the bottom of which a lubricant supply passage (6) is provided, the supply passage (6) being associated with a valve element (7), axially to the cup-shaped body, a hollow tubular body (8) being provided, the tubular body (8) having a free end facing the valve element (7), a piston (9) sealingly sliding in the cup-shaped body (5A) and on an external surface of the hollow tubular body (8), an elastic element (120) loading said piston (9) towards the supply passage (6), the piston (8) defining in the cup-shaped body (5A) an accumulation chamber (11) facing the valve element (7) and a dispensing chamber (12) constantly in communication with a cavity (8A) of the hollow tubular body (8), the cavity (8A) of the hollow tubular body (8) being also in communication with a dispensing passage (13) of the device (1), the valve element (7) being configured to assume a first position in which it closes the free end of the hollow tubular body (8), isolating said cavity (8A) from the accumulation chamber (11) and allowing communication between the supply passage (6) and the accumulation chamber (11) and a second position in which it isolates the accumulation chamber (11) from the supply passage (6) and allows the passage between the accumulation chamber (11) and the cavity (8A), characterized in that it comprises an adjustable stop (14) which limits a stroke of said piston (9) towards said elastic element (120) to adjust or nullify the volumetric quantity of lubricant delivered by the device, wherein the hollow tubular body (8) extends from a bottom (21) of a cup-shaped element (20), the bottom (21) providing at least one passage (P) for a protrusion of the adjustable stop (14).