A surgical instrument comprising: (a) an end effector comprising first and second jaws (16, 18), wherein the first jaw is movable relative to the second jaw; and (b) a shaft extending proximally from the end effector, wherein the shaft comprises: (i) a proximal coupler having proximal and distal ends (218, 220), wherein the proximal coupler includes a distal coupling feature adjacent the distal end, (ii) a tube having proximal and distal ends (224,226), wherein the tube includes: a proximal coupling feature adj acent the proximal end of the tube, wherein the proximal coupling feature is configured to engage the distal coupling feature of the proximal coupler to securably lock the tube and the proximal coupler together, and a distal coupling feature adjacent the distal end of the tube, and (iii) a distal coupler having proximal and distal ends (240, 242), wherein the distal coupler includes a proximal coupling feature adjacent the proximal end of the distal coupler, wherein the proximal coupling feature of the distal coupler is configured to engage the distal coupling feature of the tube to securably lock the distal coupler and the tube together. characterised in that the tube is formed from a rolled metallic sheet and welded to form a tubular shape. (a) an end effector comprising first and second jaws (16, 18), wherein the first jaw is movable relative to the second jaw; and (b) a shaft extending proximally from the end effector, wherein the shaft comprises: (i) a proximal coupler having proximal and distal ends (218, 220), wherein the proximal coupler includes a distal coupling feature adjacent the distal end, (ii) a tube having proximal and distal ends (224,226), wherein the tube includes: a proximal coupling feature adj acent the proximal end of the tube, wherein the proximal coupling feature is configured to engage the distal coupling feature of the proximal coupler to securably lock the tube and the proximal coupler together, and a distal coupling feature adjacent the distal end of the tube, and (iii) a distal coupler having proximal and distal ends (240, 242), wherein the distal coupler includes a proximal coupling feature adjacent the proximal end of the distal coupler, wherein the proximal coupling feature of the distal coupler is configured to engage the distal coupling feature of the tube to securably lock the distal coupler and the tube together. (i) a proximal coupler having proximal and distal ends (218, 220), wherein the proximal coupler includes a distal coupling feature adjacent the distal end, (ii) a tube having proximal and distal ends (224,226), wherein the tube includes: a proximal coupling feature adj acent the proximal end of the tube, wherein the proximal coupling feature is configured to engage the distal coupling feature of the proximal coupler to securably lock the tube and the proximal coupler together, and a distal coupling feature adjacent the distal end of the tube, and a proximal coupling feature adj acent the proximal end of the tube, wherein the proximal coupling feature is configured to engage the distal coupling feature of the proximal coupler to securably lock the tube and the proximal coupler together, and a distal coupling feature adjacent the distal end of the tube, and (iii) a distal coupler having proximal and distal ends (240, 242), wherein the distal coupler includes a proximal coupling feature adjacent the proximal end of the distal coupler, wherein the proximal coupling feature of the distal coupler is configured to engage the distal coupling feature of the tube to securably lock the distal coupler and the tube together.