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The rollers may very well be the same but the overall housings are different....... I think, I'm not at the office so I cant check right now but will later.
You cannot tell that two spare parts are not the same just checking the code number. These codes have all kind of equivalents. So, you'll get the best answer only comparing physically one with another.
I went to the parts room and did a comparison of the 2 aforementioned rollers.......... Not the the same, not even close the 251 UFR is well over a 1/4 inch bigger in diameter.............. End of debate. But keep in mind KM uses some of the same parts on a new model as the previous model and they do change the part numbers for clarification reasons so comparing is the only real way to know.
According to Katun are the UFR's for the Bizhub 250, 350 and Di-2510, 3510 the same. Their part #24317
The Di-350 is very different, the Di-351 different again and even the 25cpm machines of those both series are officially different from the higher speed series although we always used the 35cpm UFR for the 25cpm machines both as well. The wall thickness of the 25cpm machines is a little less.
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