NONE !!!

It turns out that there are NO nuts or bolts in the Eiffel Tower
ZERO, ZILCH - NADA - they only used RIVETS!
Approx 2,500,000 rivets

Although...

we've been to the Eiffel Tower and WE SAW NUTS & BOLTS! So what's going on?!

It turns out that the rivets are no longer used. One by one, each rivet is being replaced by nuts and bolts, which are easier to fasten and maintain.

For more info on the construction of the Eiffel Tower read this:
The Tower...made of iron and rivets

You can even buy one of the rivets! Click here to buy one.

And here are a few more fun facts about the Eiffel Tower - enjoy!

• Named after its designer, engineer Gustave Eiffel, the tower was built as the entrance arch to the 1889 World's Fair.
• The tower lost the title of world's tallest structure in 1930 when the Chrysler Building was completed in New York City.
• It takes a staff of more than 500 people to bring the Eiffel Tower to life each day.
• During the Nazi occupation in 1940 elevator cables were cut so Adolf Hitler would have to use the stairs.
• For proof that the tower is the most-visited monument in the world consider the fact that the demand for entrance tickets consumes two tons of paper each year.
• Special industrial cleaning teams keep the Tower in tip-top condition. Throughout the year they use four tons of paper or rag wipes, 10,000 units of detergents, 400 liters of metal cleansers and 25,000 garbage bags.
• Con artist Victor Lustig "sold" the tower for scrap metal in 1925.
• During the winter months the tower hosts an ice skating rink on the first floor.
• An old restaurant midway up on the tower was dismantled in the 1980s and put back together again on St. Charles Avenue in New Orleans.