With Angular-cli the builded filename is main.[hash].bundle.js when use ng build -prod
Is it possible to remove the hash form this filename. So just main.
Currently you can't do this with the cli, but you can come out of it and use standard Webpack.
Run ng eject in your project and it will build up a proper Webpack configuration and scripts.
You can read up on it in the Wiki on GitHub.
https://github.com/angular/angular-cli/wiki/eject
Once you've got the config you can do what @tallaxes suggested.