Hand riveting tool for fixing a mechanical insert (2; 102), such as a rivet (2; 102) of collapsible type in a housing seat, comprising: - a spacer element (5; 105) provided with an axial passage opening (6; 106) and comprising a contrasting end (7;107) that is suitable for coming to rest on, and contrasting, a front edge zone of said mechanical insert (2; 102), - a thrust bearing unit (8; 108) arranged for resting on a second end (9; 109) of said spacer element (5; 105), - a pulling member (10; 110) having shape that is oblong and shaped for extending, along a longitudinal axis, through said thrust bearing unit (8; 108) and through at least part of said axial passage opening (6; 106) of said spacer element (5; 105) for screw coupling with said mechanical insert (2; 102), characterized, in that the hand riveting tool further comprises - a threaded nut element (11; 111) that is screwable on said pulling member (10; 110) and arranged for resting on said thrust bearing unit (8; 108) on an opposite side to said spacer element (5; 105), - said pulling member (10; 110) being provided with a shaped head (12; 112) that is suitable for engaging a first key to counter rotation of said pulling member (10; 110) relative to said mechanical insert (2; 102), - said nut element (11; 111) being shaped for engaging a second key to be rotated with respect to said pulling member (10; 110), an unscrewing rotation of said nut element (11; 111) with respect to said pulling member (10; 110) causing an axial movement of said pulling member (10; 110) that is such as to pull said mechanical insert (2; 102) to deform the mechanical insert (2; 102) into a collapsed configuration in which it remains fixed in said housing seat. - a spacer element (5; 105) provided with an axial passage opening (6; 106) and comprising a contrasting end (7;107) that is suitable for coming to rest on, and contrasting, a front edge zone of said mechanical insert (2; 102), - a thrust bearing unit (8; 108) arranged for resting on a second end (9; 109) of said spacer element (5; 105), - a pulling member (10; 110) having shape that is oblong and shaped for extending, along a longitudinal axis, through said thrust bearing unit (8; 108) and through at least part of said axial passage opening (6; 106) of said spacer element (5; 105) for screw coupling with said mechanical insert (2; 102), characterized, in that the hand riveting tool further comprises - a threaded nut element (11; 111) that is screwable on said pulling member (10; 110) and arranged for resting on said thrust bearing unit (8; 108) on an opposite side to said spacer element (5; 105), - said pulling member (10; 110) being provided with a shaped head (12; 112) that is suitable for engaging a first key to counter rotation of said pulling member (10; 110) relative to said mechanical insert (2; 102), - said nut element (11; 111) being shaped for engaging a second key to be rotated with respect to said pulling member (10; 110), an unscrewing rotation of said nut element (11; 111) with respect to said pulling member (10; 110) causing an axial movement of said pulling member (10; 110) that is such as to pull said mechanical insert (2; 102) to deform the mechanical insert (2; 102) into a collapsed configuration in which it remains fixed in said housing seat. - a threaded nut element (11; 111) that is screwable on said pulling member (10; 110) and arranged for resting on said thrust bearing unit (8; 108) on an opposite side to said spacer element (5; 105), - said pulling member (10; 110) being provided with a shaped head (12; 112) that is suitable for engaging a first key to counter rotation of said pulling member (10; 110) relative to said mechanical insert (2; 102), - said nut element (11; 111) being shaped for engaging a second key to be rotated with respect to said pulling member (10; 110), an unscrewing rotation of said nut element (11; 111) with respect to said pulling member (10; 110) causing an axial movement of said pulling member (10; 110) that is such as to pull said mechanical insert (2; 102) to deform the mechanical insert (2; 102) into a collapsed configuration in which it remains fixed in said housing seat.