Shogyo offers a unique line of DC Power Connectors with a quarter turn locking feature. These are recommended for any application in which a completely secure connection is required. They are especially useful in rugged applications whereby a disconnection cannot be risked by simply tugging on the cord. Below, please see some photos to illustrate how these work.
Here are links to the product pages.
2.0MM DC JACKS:
2.35MM DC JACKS:
2.5MM DC JACKS:
2.1MM DC PLUGS
2.5MM DC PLUGS