The blades are 4.173" long, 0.862" wide, and 0.072 thick, with three slotted holes.
Sears says these blades are no longer available, but here at exeye, they are! (For now...)
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These don't fit all Craftsman jointer/planers! Be sure to check your blades with the dimensions I have given!
I am trying to collect a list of model numbers that these blades do not fit:
113.206400 4-3/8" jointer planer
If you have a jointer/planer model that these blades do not fit and you can't find them elsewhere, please contact me with your model number. I will consider having them made, or let you know where you can find them.
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Notes about these jointer-planers:
Belts are also discontinued by Sears but replacements are available. They are 120XL037 12" 60-tooth 3/8" width timing belts. These are readily available, and I am selling these belts at a low-cost in another listing.
Motors are also a part that people are looking for. Unfortunately it is a very non-standard motor and is no longer made. I hear of two failure modes for these motors: bearing failure and cracking of the plastic case. Bearings are a standard item and if you can get to them you should be able to ID them and buy replacements. Case cracks are more serious, but I would try "Plastic Welder" epoxy which gives a pretty strong repair. I do not plan on selling motors or parts for them.
Bearings are a standard hardware item. I think they are 6200-2RS bearings, but if you need to replace them, take the old ones out and look at the number on them, or take them to a bearing supplier. They are readily available and are inexpensive.
I have a PDF copy of the manual for 149.236223 available free on my website. Search for the model number, "149.236223", and "exeye", my eBay user name.
The manual has instructions for changing the blades. The way I set the height is to adjust the infeed table to the same height as the outfeed table (zero cutting depth) then use a straightedge to get the two blades set to the same height across their width. It only takes a couple of minutes.