Drill chuck key 1/2" with 15/64" pilot
Skil 6442 corded drill has a 1/2 inch (13mm) chuck of type Rohm S2A with chuck key 1/2" with 15/64" pilot. If you are looking for the 1/2" with 15/64" pilot chuck key in your local hardware stores, then don't even waste your time.
Drill press model ZJ4113, chuck 1.5-13mm B16 also uses the same chuck key to the best of my knowledge.
Note that when looking for a hard to find chuck key, searching for the chuck model instead of drill model will be helpful.
If you actually get stuck with a 15/64" pilot, then finding a replacement chuck key will be some trouble.
The chuck key that came with Skil 6442 was good (better than store replacements), but it was worn out after time. The drill press that I bought did not even come with a chuck key.
Just a few places have that chuck key. LINK 1 has a very well thought-out chuck key with a ratcheting mechanism and a long handle.
http://www.mcfeelys.com/product/RKC-2477/13mm-Rohm-RatchKey-Chuck-Key-HC-15
If you try to buy a 1/2" key, or a four-way key on places like E-Bay, you will need to specifically ask them about the pilot dimensions on the 1/2" side of the key. Most of the 1/2" keys will have the wrong pilot dimension and not fit.
The links below are what I found after searching for several hours:
http://www.homeandbeyond.com/prod-0086783.html
http://www.thegreathardwarestore.com/ProductDetails.asp?ProductCode=373954&click=2744
http://www.idealtruevalue.com/servlet/the-51730/Detail
http://www.shop.com/Danaher_Tool_30825_3_8_1_2_Chuck_Key-33461278-43756548-p!.shtml?sourceid=298
http://www.stilltools.co.uk/proddetail.php?prod=S2PK-S2A
Original parts for the Skil 6442: http://www.toolsandpartsdirect.co.uk/store/parts.asp?MODEL=EMD403----A&PARENT=293&HEAD=%C2%A62%C2%A6DeWalt%C2%A614%C2%A6Drilling/Driving%C2%A681%C2%A6Drills%C2%A6293%C2%A6Drills
http://www.ereplacementparts.com/chuck-key-p-81804.html
http://www.toolpartsdirect.com/cgi-bin/noframes.cgi/skil/6443
You can also search for "chuck key 15/64" on E-Bay: http://business.shop.ebay.com/items/_W0QQ_dmptZBIQ5fToolQ5fWorkQ5fHolding?_nkw=chuck+key+15%2F64&_sacat=12576&_fromfsb=&_trksid=m270.l1313&_odkw=chuck+key&_osacat=12576
or Geegle Products:
http://www.google.com/products?q=chuck+key+15%2F64&hl=en&show=li
Look at any marking on the chuck to see if it provides any information.
The first number for chuck key is not its outer diameter, but the maximum diameter of a drill bit that the chuck will take (did not know)
By the way, the chuck key that I actually got for my drill and press is this one:

a RatchKey ratching chuck key from McFeely's. They no longer sell this item, and it is not available through online distributors. However, the key is so awesome (warm plastic, ratching, easy to use), that you might want to buy it here thru the phone: http://www.ratchkey.com/ratchkey_chuckkeys.html. UPDATE: I have only used this ratchkey on a light-duty basis at home, but it broke after about a year of seldom seeing use. It was made of plastic, after all.
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