Need duracraft drill model dp1214 need 5/8 in chuck

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they use generic jacob chucks that you can get from any reputable tool shop or hardware store
most likely find that the chuck is on a taper adapter rather than a screw on unit

Ebay has chuck keys. Chuck comes in different shank sizes. There are all in one types too, fits all chucks, cheap too.

It almost certainly has a #2MT (#2 Morse Taper) drill adapter. Lower the quill and look for a slot on each side of the quill - that's a knockout slot. Insert a steel wedge into the slot and tap the wedge to force the Morse taper apart.

You can buy replacement Morse taper chucks from any number of woodworking or woodturning supply places, or from metalworking supply places, or eBay. You can get them from Grizzly, Packard, Rockler, Enco, Victor, MSC, Grainger... you can buy them through Amazon, you can get them at Sears.

You can buy the assembly as one unit or as two pieces - the chuck and the adapter. If you buy it as two pieces, be sure that the adapter and the chuck have matching tapers - that's usually a Jacobs taper like a #3JT or a #34JT, for example. It's much easier if you buy one matched unit.

You can get keyed chucks, keyless chucks, and automatic chucks with a #2MT shank.

The 1/2 inch is the max size drill that will fit into the chuck. There are only a few different key sizes, and sears sells them in their tool area. Easiest thing to do is find the size of the hole the chuck fits into by using the back end of a drill bit that fits the best. Measure that drill bit or take it with you to the store. You might find two different size keys with that size pilot hole, or maybe only one. Good luck!

usually that requires special fixtures to remove the collar and a press, I would recommend cleaning with WD-40 and wiping clean all exposed parts and if you have compressed air try using that also, WEAR safety glasses.

that is a 1/2 chuck but you would also need to know the pilot hole size and then you can go to any hardware store (Lowes, Home Depot) and buy a replacement. Check to see if the chuck has a name on it like Jacobs or something similar but I don't think there is anything special. A ROHM chuck does however take a funny looking key.

There are perhaps half a dozen sizes of chuck keys. Sears carries them. You can measure the size of the pin by finding a drill bit or bolt that fits well and taking that to the store with you. You can approximate the size of the teeth by using a piece of paper and forming it over the chuck and using a pencil to rub over the teeth. Put a hole in the paper with the bolt or drill bit to capture the radius from the pin to the teeth. If you find a couple of close candidates, buy them both. Sears will take the other one back. Good luck.

Are you talking about the chuck key? That's the little wrench with a collar of gear teeth on it.
There are only a few standard sizes plus a couple of odd-balls. Last time I looked, Sears carried a good selection. If you have the old one, take it with you to the store. If you don't have the old one, find a way to measure or approximately measure what you need. Another chuck key that doesn't fit can be a useful reference. If you can find something (maybe a drill bit) that is a close fit into one of the three holes in the chuck, that can be useful too.