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I have a DC power cable that ends in a 5.5 x 2.5 mm plug. I purchased a panel mount jack for it, and yes, the plug fits. However, the barrel is much longer than the jack, so the barrel does not fit flush, which seems like a bad idea.

The barrel length is about 12 mm.

The panel mount jacks I see online seem similar to the one I have. How do I find one (a spec or search term) that will have the right depth?

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Searching for 5.5x2.1mm jack dimensions offered a Mouser parametric search for DC power plugs.

A search for DC barrel jack brought me to Wikipedia's Coaxial power connector.

I seem to remember buying 14 mm long jacks for one project. (The socket was already in the device to be powered.)

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