Pinball solenoids come with designations like 23-800. The first number, 23 in this case, represents the American Wire Gauge (AWG) used. The second number, and the more important number, is the number of windings which is related to its power rating. A solenoid with less windings, say 400, is more power and is used for such applications as actuating the flippers. These solenoids get very hot very quickly, which increases the resistance of the solenoid thereby decreasing the current and therefore the power. To avoid overheating, these high powered solenoids will have two coils. One for the main actuation of the solenoid, and another to maintain the position. The second solenoid will have a smaller wire gauge and more windings. In example, my flipper 'coils' are 15-411, 15 AWG and 411 windings. They are quite strong and found in some of the latter Williams pinball machines such as the popular Adams Family machine. You can find a lot of good additional information
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