# Bolt Representation — Lesson 1

Bolts serve different purposes in mechanical systems. Depending on their purpose, their number might change in the design.

For instance, in a system such as this, there are fewer bolts and it can be modeled using solid elements.

But is it efficient to model a system such as this, which has numerous bolts, using the same solid elements?

How do we decide which representation to use?

This lesson discusses the pros and cons of modeling a bolt as a solid body versus a line body. It also explains a simplified approach for bolt modeling, along with the types of bolts and their contact representation in Ansys Mechanical.

### Lecture

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