What did the symbol of the hammer mean to Hitler?

The hammer symbolises urban industrial workers while the sickle symbolises agricultural workers (peasants)—who together, as the Proletarian class, form the state.

the hammer and sickle meant for worker-peasant alliance, with the hammer a traditional symbol of the industrial proletariat and the sickle a traditional symbol for the peasantry. Basely it meant worker-peasant allance.

Explanation:

because mexico wanted to choose a centralized location