Cylinder lock assembly comprising a housing and a cylinder placed in the housing , which cylinder extends along a cylinder axis (C) and is rotatable relative to the housing from an initial position around the cylinder axis (C) only when a fitting key is placed in the cylinder , wherein the housing along the cylinder axis (C) is provided with a series of driver pin channels which extend in respective axial driver pin planes (S) radially with respect to the cylinder axis (C) from the cylinder in the housing , which axial driver pin planes (S) are perpendicular to the cylinder axis (C), wherein the cylinder along the cylinder axis (C) is provided with a series of key pin channels which in the initial position are in line with the driver pin channels such that between the housing and the cylinder respective pin passages are formed, wherein the cylinder is provided with a blocking bar which extends along the cylinder axis (C) and which is configured in the absence of a fitting key in the initial position to engage the housing to counteract rotation of the cylinder relative to the housing , and to engage the housing less or not when a fitting key is placed in the cylinder , wherein the housing is provided with an engagement structure which is configured to have the blocking bar in the initial position engage the engagement structure , wherein the engagement structure at the axial driver pin planes (S) is provided with respective guiding structures which are configured to counteract engagement between key pins and/or closing plates of the cylinder on the one hand and the engagement structure on the other hand, wherein the blocking bar is provided with one or more cams which face the housing and which are configured to engage the engagement structure , wherein the one or more cams are arranged in a manner axially staggered with respect to each of the axial driver pin planes (S), wherein the engagement structure comprises a series of openings in a cylinder guiding inner surface of the housing , which openings are arranged in a manner axially staggered with respect to each of the axial driver pin planes (S). wherein the housing along the cylinder axis (C) is provided with a series of driver pin channels which extend in respective axial driver pin planes (S) radially with respect to the cylinder axis (C) from the cylinder in the housing , which axial driver pin planes (S) are perpendicular to the cylinder axis (C), wherein the cylinder along the cylinder axis (C) is provided with a series of key pin channels which in the initial position are in line with the driver pin channels such that between the housing and the cylinder respective pin passages are formed, wherein the cylinder is provided with a blocking bar which extends along the cylinder axis (C) and which is configured in the absence of a fitting key in the initial position to engage the housing to counteract rotation of the cylinder relative to the housing , and to engage the housing less or not when a fitting key is placed in the cylinder , wherein the housing is provided with an engagement structure which is configured to have the blocking bar in the initial position engage the engagement structure , wherein the engagement structure at the axial driver pin planes (S) is provided with respective guiding structures which are configured to counteract engagement between key pins and/or closing plates of the cylinder on the one hand and the engagement structure on the other hand, wherein the blocking bar is provided with one or more cams which face the housing and which are configured to engage the engagement structure , wherein the one or more cams are arranged in a manner axially staggered with respect to each of the axial driver pin planes (S), wherein the engagement structure comprises a series of openings in a cylinder guiding inner surface of the housing , which openings are arranged in a manner axially staggered with respect to each of the axial driver pin planes (S). <EOS>