Clutch comprising: a fixed hub (101, 1101) comprising a central coupling hole, said central coupling hole being configured for coupling with a rotating shaft; a movable hub (102, 1102) configured for being mounted along an axial direction onto said fixed hub (101, 1101); a plurality of discs configured for being interposed between said fixed hub (101, 1101) and said movable hub (102, 1102); wherein said fixed hub (101, 1101) and said movable hub (102, 1102) are shaped so as to rotate jointly with each other and so as to slide axially with each other, getting farther or closer such that said fixed hub (101, 1101) and said movable hub (102, 1102) exert a variable axial load onto said plurality of discs thereby transmitting a torque, the clutch being characterised in that, said movable hub (102, 1102) comprises a central access hole, said central access hole being configured for allowing access to said central coupling hole passing internally through said plurality of discs interposed, so as to operate locking means for said coupling with said rotating shaft, wherein said fixed hub (101, 1101) comprises first sliding elements (303, 1303), respectively comprising first sliding surfaces (403, 403b; 1403, 1403b, 1403c) sloped according to a helix, and wherein said movable hub (102, 1202) comprises second sliding elements (304; 1304, 1304b, 1034c), respectively comprising second sliding surfaces (404, 404b; 1404, 1404b, 1404c) sloped according to said helix and configured for mating with said first sliding surfaces (403, 403b; 1403, 1403b, 1403c), said first sliding surfaces (403, 403b; 1403, 1403b, 1403c) and said second sliding surfaces (404, 404b; 1404, 1404b, 1404c) being adapted to move said movable hub (102, 1102) farther or closer with respect to said fixed hub (101, 1101) when subjected to a torque, so as to vary said axial load onto said plurality of discs, wherein said movable hub (102, 1102) further comprises a cylindrical drawing element comprising an external drawing surface, said plurality of discs being assembled onto said drawing element of said movable hub (102, 1102), said drawing surface being shaped so as to couple with an internal toothing of driven discs, and wherein said second sliding elements (304; 1304, 1304b, 1034c) of said movable hub (102, 1102) are adjacent to an internal surface of said drawing element. a fixed hub (101, 1101) comprising a central coupling hole, said central coupling hole being configured for coupling with a rotating shaft; a movable hub (102, 1102) configured for being mounted along an axial direction onto said fixed hub (101, 1101); a plurality of discs configured for being interposed between said fixed hub (101, 1101) and said movable hub (102, 1102); wherein said fixed hub (101, 1101) and said movable hub (102, 1102) are shaped so as to rotate jointly with each other and so as to slide axially with each other, getting farther or closer such that said fixed hub (101, 1101) and said movable hub (102, 1102) exert a variable axial load onto said plurality of discs thereby transmitting a torque, the clutch being characterised in that, said movable hub (102, 1102) comprises a central access hole, said central access hole being configured for allowing access to said central coupling hole passing internally through said plurality of discs interposed, so as to operate locking means for said coupling with said rotating shaft, wherein said fixed hub (101, 1101) comprises first sliding elements (303, 1303), respectively comprising first sliding surfaces (403, 403b; 1403, 1403b, 1403c) sloped according to a helix, and wherein said movable hub (102, 1202) comprises second sliding elements (304; 1304, 1304b, 1034c), respectively comprising second sliding surfaces (404, 404b; 1404, 1404b, 1404c) sloped according to said helix and configured for mating with said first sliding surfaces (403, 403b; 1403, 1403b, 1403c), said first sliding surfaces (403, 403b; 1403, 1403b, 1403c) and said second sliding surfaces (404, 404b; 1404, 1404b, 1404c) being adapted to move said movable hub (102, 1102) farther or closer with respect to said fixed hub (101, 1101) when subjected to a torque, so as to vary said axial load onto said plurality of discs, wherein said movable hub (102, 1102) further comprises a cylindrical drawing element comprising an external drawing surface, said plurality of discs being assembled onto said drawing element of said movable hub (102, 1102), said drawing surface being shaped so as to couple with an internal toothing of driven discs, and wherein said second sliding elements (304; 1304, 1304b, 1034c) of said movable hub (102, 1102) are adjacent to an internal surface of said drawing element.