These printers use the TK-1172 cartridge:
Click On a Printer to View it's Cartridges
          Kyocera-Mita Ecosys M-2040 DN
          Kyocera-Mita Ecosys M-2540 DW
          Kyocera-Mita Ecosys M-2640 IDW
          Kyocera-Mita M 2040 DN
          Kyocera-Mita M 2540 DN
          Kyocera-Mita M 2540 DW
          Kyocera-Mita M 2640 IDW