Looking for belt length for older bench sander model # 28643

the belts will be a generic length and width
and quality tool shop will have belts

Go to the link Best Disc Sanders For Sanding In 2018
you can easily find out.

hi bob.
not sure if this link will be of any use to you but have a look,or you could try ebay.
parts for my Bench Pro model ST 46 combination 4 belt 6 disc sander Google...

manual/diagram/parts list - http://www.mikestools.com/download/Delta-Parts-Lists/31-352-1-Inch-Sander-Grinder-AFM1.pdf

please be more specific!!
guessing - bench top disc/belt sanders' discs usually use stick on backed sand paper discs ;)

If you want to best Disc/Best sanders go to the link https://bestdiscsanders.kinja.com/more-detail-about-belt-sanders-1823124699

The local hardware store has brushes in all different sizes in a box, next to the switches, fuses, plugs, cords, tool type stuff. They are standard sizes, should be able to find them no problem. Hope this helps.

I found a PDF file on Sears.com website for the original manual for my belt / circular sander.

My answer comes almost a year after the original question, but I'll post it anyway for those who end up here after a search.
Black & Decker no longer supplies drive belts for the BR400 sander, but you can get a replacement elsewhere if you know what to ask for.
The belt is a synchronous, single-sided "XL" series belt, and mine had 120XL031 printed on it. The belt width is 0.31in or 5/16in or 7.9mm. Its pitch (distance from tooth to tooth) is 0.20in or 1/5in or 5mm. Its total height is 0.09in, and tooth height is 0.045in. It has 60 teeth, making the total length 12in.
I found a replacement at sdp-si.com, part number A 6R 3-060031.
Look here for timing belts (inch), then narrow the search for single-sided, .200 (XL) pitch, 60 grooves, 5/16 width.

craftsman belt sander just stopped - does craftsman still have life time warrenty?