The utility model provides a pivot of inscription formula, relates to rotatable parts technical field, and that solve is increase of service life's technical problem. The axis body of this pivot at least the one end tip set up have in the stomidium of the conical surface to it has movable awl piece to embed at the stomidium, a stomidium and an awl piece cone combined with, the axis of stomidium and awl piece all with the dead in line of axis body, and microcephaly's end of awl piece is towards the drill way of stomidium, axial through's screw is seted up in an axle center of boring piece. The utility model provides a pivot is fit for using as the pivot of belt pulley, gear.