The combination of a cylinder lock and key, wherein the key comprises a blade with a longitudinally extending edge portion at one side of the blade provided with a coded surface for engaging the ends of a row of locking pins in the cylinder core of the lock. The coded surface has code portions which engage a segment of the end of each pin spaced from the center thereof, and transition portions for guiding the pins between adjacent code portions and which are of concavely curved cross-sectional shape to provide for arcuate engagement with the pins, the code portions and transition portions of the coded surface being open to the side of the key blade and spaced from the other side thereof. The coded surface is produced by moving a rotary cutting tool relative to the key blank with substantially the same movement as the pins undergo relative to the key as the latter is inserted into and removed from the cylinder of the lock. There may be more than one row of locking pins, which may co-operate with side bars in the cylinder.
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