Or you can install a metal box, called a postal key keeper, that is locked with a. This lets the person with the master key access any lock in the group, while someone with a change key can open only his or her own lock. No USPS approved mailbox locks are master keyed. Changing the master key for physical mailboxes is a logistical nightmare, which is why this problem won’t be fixed anytime soon. It’s a video of two postal thieves using a master key to open apartment building mailboxes. In this lock design, the lowest pin is the same length in each lock in the group, but the master wafer varies in length. Here’s a physical-world example of why master keys are a bad idea. In both cases, there is a gap at the shear line and the key is able to turn. The change key might raise the pins so that the shear line is just above the top of the master wafer, while the master key might raise the pins so the shear line is at the bottom of the master wafer. Doors include a heavy duty 5 pin cylinder cam lock with a dust/rain shield and 3 keys One compartment is labeled 'Outgoing Mail' and includes a weather protection flap and an 11-3/4' W x 3/4' H mail slot Include a carrier access door for U.S.P.S. When three pins are combined in a shaft, there are two ways to position the pins so they open the lock. This third pin is called a master wafer or spacer. In these locks, a few of the pin pairs are separated by a third pin. USPS Mailbox Key Blank Manufacturer: Ilco Product Description: Yale 999 5 Pin. The change key will open only that specific lock, while the master key will open that lock and several others in a group. I lost the keys to my Master Lock lock and dont know the key number. Some locks are designed to work with two different keys. The right combination of pins lines up perfectly with the notches in the key. The correct key will push each pin pair up just enough so that the point where the two pins come together lines up perfectly with the space where the cylinder and the housing come together - this point is called the shear line. The incorrect key will push the pins so that most of the top pins are still partly in the plug and partly in the housing. When you insert a key, the series of notches in the key push the pin pairs up to different levels.
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