Locking arrangement comprising a lock cylinder and a matching key

A locking arrangement, comprising:

• a locking cylinder;
• and
• a matching key;
• the key having a flat key bit with a narrow spine, two broad sides which run substantially parallel to one another,
• wherein the key bit has a plurality of coding notches on a front, which is opposite to the spine, at first coding positions, wherein each of said coding notches has an inward apex, and first and second flanks, wherein said first flanks are substantially parallel to one another, and said second flanks are substantially parallel to one another so that an angle of first and second flanks is uniform for all coding notches,
• wherein the coding notches comprise a deepest cut-in coding notch, wherein the deepest cut-in coding notch defines a first spacing which is a distance from the spine to the apex of the deepest cut-in coding notch;
• wherein the locking cylinder has a cylinder housing, a cylinder core which is mounted in a bearing hole in the cylinder housing and which has a keyway for insertion of the key bit, tumblers which are located in core pin holes, which interact with the coding notches on the key bit, and which are disposed at second coding positions on the cylinder, the second coding positions coinciding with the first coding positions on the key bit when the locking bit is inserted as far as a stop in the keyway, and
• a sensing member which is located in a supplementary core hole that extends transversely relative to the core pin holes and senses a sensing point on a broad side of the key,
• wherein a distance of the sensing point to the spine defines a second spacing that is greater than the first spacing;
• wherein the supplementary core hole is arranged between two immediately adjacent core pin holes and the sensing member has a tip that senses the sensing point on a broad side of the key situated between two immediately adjacent coding positions;
• wherein the sensing point is situated close to a peripheral edge of a coding notch which is cut-in to a lesser extent than the coding notch that is cut-in to the deepest extent in such a way that deepening the coding notch which is cut-in to the lesser extent to a depth of the coding notch that is cut-in to the deepest extent leads to disappearance of the sensing point from the broad side of the key.