2.1x5.5mm DC Jacks and Plugs

[Zinger]

Hopefully, this isn't the most n00b question ever, but why are 2.1mm jacks so hard to find?

When I search Digi-Key for in-line, 2.1x5.5mm plugs, there are 17 items ranging from 5 to 8A from several manufacturers.
https://www.digikey.com/products/en/connectors-interconnects/barrel-power-connectors/435?k=&pkeyword=&pv1989=0&pv28=329&pv29=2&pv1954=28&pv69=185&FV=ffe001b3&mnonly=0&newproducts=0&ColumnSort=0&page=1&stock=1&quantity=0&ptm=0&fid=0&pageSize=25

When I search for the equivalent jack, I get 2 items both with an industrial looking "solder cup" connector.
https://www.digikey.com/products/en/connectors-interconnects/barrel-power-connectors/435?k=&pkeyword=&pv1989=0&pv28=381&pv29=1&pv1954=28&pv69=185&FV=ffe001b3&mnonly=0&newproducts=0&ColumnSort=0&page=1&stock=1&quantity=0&ptm=0&fid=0&pageSize=25

It's the same thing on Mouser.

eBay has plenty of jacks, but they don't list amp ratings and there's never a data sheet.

Why the difference?  Shouldn't there be a jack for every plug and a plug for every jack?

[Monkeh]

Why are you looking for in-line jacks?

While you're at it, try 2.0x5.5mm: The male pin does need to be smaller than the hole it goes into.

[Zinger]

I'm wiring a control circuit between a power supply and an LED strip.  The LED strip has a 2.1x5.5mm plug.

[mariush]

Newark has a bunch of them : http://www.newark.com/w/c/connectors/power-entry-connectors/dc-power-connectors-barrel-plugs-jacks?barrel-inner-diameter=2.1mm

[Monkeh]

I'm wiring a control circuit between a power supply and an LED strip.  The LED strip has a 2.1x5.5mm plug.

Right, but.. why do you need the jack flapping around in the breeze?

[Monkeh]

Thanks.  That's perfect.  I wonder why the other suppliers don't carry these.

.. Carry what, pretty much the same assortment of 2.1x5.5mm plugs you linked to?

If you're looking for an in-line jack for some reason, search for 2.0x5.5mm. If you want a panel or board mounted jack, remove the in-line mounting filter and search for 2.0x5.5 and 2.1x5.5mm. Digikey have many.

[Zinger]

Everything is going to be enclosed but I need to be able to swap the battery pack easily. So I need the 2.1mm jack/plug to get power in.  I could solder the LED directly to the control circuit.

[Monkeh]

Everything is going to be enclosed but I need to be able to swap the battery pack easily. So I need the 2.1mm jack/plug to get power in.  I could solder the LED directly to the control circuit.

..

Perhaps a link speaks a thousand words.

https://www.digikey.com/products/en/connectors-interconnects/barrel-power-connectors/435?k=&pkeyword=&pv28=381&pv1954=25&pv1954=42&pv1954=28&FV=ffe001b3&mnonly=0&newproducts=0&ColumnSort=0&page=1&quantity=0&ptm=0&fid=0&pageSize=25