A spaced dash (i.e. with a single space before and after it) is used:
The dash ( – ) - Easy Learning Grammar
- at the beginning and end of a comment that interrupts the flow of a sentence.
- Now children – Kenneth, stop that immediately! – open your books on page 20.
- to separate off extra information.
- Boots and shoes – all shapes, sizes and colours – tumbled out.
- to indicate a range.
- pages 26–42
- between two adjectives or noun modifiers that indicate that two countries or groups are involved in something or that an individual has two roles or aspects.
- Swedish–Norwegian relations improved, the United States–Canada free trade pact
- a mathematician–philosopher
- to indicate that something such as a plane or a train goes between two places.
- the Anguilla–St Kitts flight
- the New York–Montreal train