Spin-on filter for a filter apparatus for fluid, in particular liquid, in particular oil or fuel, in particular of an internal combustion engine, in particular of a motor vehicle, wherein the spin-on filter features: - a housing pot in which a filter element is disposed, - a connecting body disposed frontally on the housing pot, which connecting body is provided with a centrally located central opening and in particular with at least one fluid opening which is offset radially outwardly opposite the central opening, - a filter-sided connecting part of a connecting means for releasably connecting the spin-on filter to a filter head of the filter apparatus, which connecting part is disposed at the centrally located central opening, wherein the filter-sided connecting part is releasably connectable via a combined plug-in and rotational movement with respect to a connecting axis to a connecting piece of a head-sided connecting part of the filter head, and wherein an internal seal is provided which features a sealing surface surrounding a central fluid channel and axially offset with respect to the filter-sided connecting part towards the filter element, and on which a circumferential sealing surface of a filter-head-sided fluid connection can sealingly abut in order to separate a raw side from a clean side of the spin-on filter, wherein the internal seal is disposed on an end body, in particular of an end disc, of a filter element, in particular of a round filter element, of the spin-on filter, and wherein the sealing surface of the internal seal forms an at least axial contact with respect to the connecting axis for the sealing surface of the head-sided fluid connection. wherein the spin-on filter features: - a housing pot in which a filter element is disposed, - a connecting body disposed frontally on the housing pot, which connecting body is provided with a centrally located central opening and in particular with at least one fluid opening which is offset radially outwardly opposite the central opening, - a filter-sided connecting part of a connecting means for releasably connecting the spin-on filter to a filter head of the filter apparatus, which connecting part is disposed at the centrally located central opening, - a housing pot in which a filter element is disposed, - a connecting body disposed frontally on the housing pot, which connecting body is provided with a centrally located central opening and in particular with at least one fluid opening which is offset radially outwardly opposite the central opening, - a filter-sided connecting part of a connecting means for releasably connecting the spin-on filter to a filter head of the filter apparatus, which connecting part is disposed at the centrally located central opening, wherein the filter-sided connecting part is releasably connectable via a combined plug-in and rotational movement with respect to a connecting axis to a connecting piece of a head-sided connecting part of the filter head, and wherein an internal seal is provided which features a sealing surface surrounding a central fluid channel and axially offset with respect to the filter-sided connecting part towards the filter element, and on which a circumferential sealing surface of a filter-head-sided fluid connection can sealingly abut in order to separate a raw side from a clean side of the spin-on filter, wherein the internal seal is disposed on an end body, in particular of an end disc, of a filter element, in particular of a round filter element, of the spin-on filter, and wherein the sealing surface of the internal seal forms an at least axial contact with respect to the connecting axis for the sealing surface of the head-sided fluid connection.