Innovation No. 22 of 77 in the book
The Door Lock
A wooden pin-tumbler lock invented thousands of years before modern versions
- When
- c. 1500 BCE
- Dynasty
- 18th Dynasty
- Era
- New Kingdom
The pin-tumbler lock — the exact mechanism Yale ‘invented’ in 1861 and put on doors worldwide — was already working on Egyptian doors by around 1500 BCE, in the New Kingdom.
A wooden bolt held a set of loose pins that dropped into holes and jammed it shut. The right key, a wooden bar with matching pegs, lifted each pin to just the right height and freed the bolt.
That is the same principle inside the lock on your front door right now, only in bronze and steel.
Egypt didn’t invent the idea of a lock — it invented the one we still use.
Wooden locks, bolts and keys have been recovered from sites ranging from New Kingdom settlements to the Greco-Roman town of Karanis in the Fayum Oasis, and the devices appear on tomb walls too. Egypt's dry soil preserved the wooden parts, which is why the mechanism can be reconstructed exactly. One of the earliest surviving examples was actually found in an Assyrian palace in northern Mesopotamia — but Greek and Roman writers called these "Egyptian locks", and scholars agree that is where the technology came from.
Frequently Asked Questions
Didn't Mesopotamia have locks first?
It had fastenings — sliding bolts held by knotted cord, and clay seals that showed if a door had been opened. Those secure a door but have no moving mechanism. The pin-tumbler, where loose pins must be lifted to exact heights, is the Egyptian contribution.
How big was an Egyptian key?
Large. Built for thick wooden doors, a key could run up to two feet long and weigh several pounds. Temple wardens and treasury officials carried them slung over one shoulder.