The present invention relates to a grate block (10) for an incineration grate, in which successive grate blocks are arranged one above the other in a step-like manner. The grate block (10) comprises a block body (12) which comprises an upper wall (14) which forms the support surface (16) along which the material to be fired is to be conveyed and the front end of which, viewed in the pushing direction S, forms an edge (19), Over which the support surface (16) drops into a pushing surface (22) formed by a front wall (20). The front wall (20) has at least one air supply opening (38) for supplying air to the combustion grate, which, viewed in longitudinal section, runs at right angles or at an angle to the thrust surface (22). At least the front support edge (23) of the thrust surface (22) is arranged in a plane E which runs essentially at right angles to the longitudinal axis L. The grate block is characterized in that at least one side wall (28a, 28b) has a wear marking (42) which describes a contour (44) spaced from the plane of the support surface (16) and / or from the plane of the thrust surface (22).
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