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NUTS AND BOLTS (1)

V. Ryan 2003 - 2008

 

Bolts are used to join pieces together either permanently or temporarily. Many steel structures, including buildings, are simply bolted together. For example, the Eiffel Tower in Paris was originally a temporary structure and after twenty years it was to be dismantled. For this reason most of the steel components were bolted together. However, the tower has lasted well over a hundred years. Much of the structure of the Empire State Building in the USA is also bolted together. Nuts and bolts can also be used to fix together small structures such as furniture. Nuts and bolts come in many different types and sizes and some are shown below.

 

TYPICAL COACH BOLT

   

The coach bolt has a square collar under the domed head and this locks into the wood when the nut is tightened. A washer is normally placed before the nut to stop it sinking into the wood as it is turned.

   

   

 

   

Two spanners are needed to tighten this nut and bolt. The first spanner fits round the hexagonal head of the bolt and a second spanner is used to tighten the hexagonal nut.

   

QUESTIONS:
1. Sketch an hexagonal nut and bolt. Your diagram should show a practical way of using them.
2. Explain why a washer is sometimes used.

   

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