The pin lock comprises side openings (8) located in the cylindrical component (1) in line with the channels (4) of the tumbler (3) which are closed by means of a cover (10). In the coding method, a configuration key is inserted into the slot (11), in line with configuration pins, the configuration key is turned to align the channels (4) of the tumbler (3), which include the configuration pins, with the side openings (8), the configuration pins are extracted via the side openings (8), the bottom pins (7) are inserted through the side openings (8) with the length and in the order corresponding to the predetermined coding, the side openings (8) are closed with the cover (10), and the configuration key is turned to the initial position in order to extract it, leaving the lock coded.