High-pressure pump for supplying fuel to an internal-combustion engine

A high-pressure pump for supplying fuel to an internal-combustion engine, the pump comprising:

• a pump body;
• a shaft, which extends along a longitudinal axis, is supported rotatably about the longitudinal axis by the pump body, the shaft having an eccentric portion and a prismatic jacking end;
• a first pumping station having a gear engaged with the prismatic jacking end;
• and
• a second pumping station having at least one piston which is slidable inside the pump body transversely with respect to the longitudinal axis, the piston being actuated by the eccentric portion of the shaft,
• wherein the prismatic jacking end is made of a first material and a remainder of the shaft is made of a second material, the first material being harder than the second material,
• wherein the remainder of the shaft comprises an engaging portion with a pocket housing partly the prismatic jacking end, and
• wherein the prismatic jacking end comprises a prismatic body and an end lug, the pocket comprising a first seat for housing the end lug and a second seat for housing the prismatic body.