I have a band saw model 113.248.211 and would like to know what width band saw blade i can use. It is 80" long.

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I'm using Haltbar band saw blades that I got from sawblade.com . They have great quality band saw blades. I ordered 10 blades from them last month and shipping was free.

The blade length is probably almost 100" , but I suggest you try to calculate the length , try this method Calculate Belt or Band Saw Blade Length VintageMachinery org

The manual says that it will support blade widths from 1/8 inch to 1/2 inch. You can use 80" or 80 1/2" band saw blade. I got my band saw blade on sawblade.com . I like them .

AWSBS2 band saw takes 70 1/2" long blades. Blade Widths : 1/4", 3/8", 1/2" .

In my search, this is the closest band saw to 11.324200 that have almost the same structures and features. 113.24201 band saw . You can download the manual from there. If you need a blade, I recommend you to visit sawblade.com , they custom made blades, I ordered my blades from them .

I can't find a Sears model 113.24330C but there is a 113.243300 so hopfully part of the last 0 got worn off. That model is a 12" bench top band saw that uses a 1/4 X 80-inch blade.

Band saws are measured by length and width of the blade so measure the length or just take it to the parts place and you should be able to get one of the same size unless its an old or off size no longer made but I dont see that being a problem. Try ebay for your measurements or even Grainger.
http://business.shop.ebay.com/Metalworking-Tooling-/92084/i.html?_nkw=band+saw+blades&_catref=1&_fln=1&_trksid=p3286.c0.m282

Two potential issues here:

a.) You probably need to align your bandsaw wheels. Here's a link to a craftsman 12" bandsaw manual. Assuming you have model 113243310, 113243311, 113243300, or a similar model, read over page 12-14 "Installing the blade". Specifically, look at section 10 about adjusting the tracking.

Having the blade guides set properly is important too. A thrust bearing (the one up top, behind the blade) that's set too far forward can push the blade off the wheels too.

b.) If it's flat out too loose and you can't get it tight, the blade might be too long. It's worth double checking your manual to confirm you are supposed to be using an 80" blade and double checking the blade package to make sure you actually have an 80" blade.

Blade Width is important when purchasing a band saw. Most saws accept narrow 1/8" blades for cutting detailed designs and tight curves. Better saws also accept wider blades. Wide blades don’t flex as much as narrow ones, but they make accurate straight cuts in thick stock quicker. There are also some wide blades available that can cut metal.