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Let me clear this up since you still seem to be a little confused.
The Eheim 1250 has a 1/2" outlet barb on it, but the thread on that barb is 3/8" BSP. 3/8" BSP threads are large enough to support a 5/8" barb if required.
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Dude!,I'm not confused!, you were very enlightening

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The barb (outlet) on my Ehiem 1250 is 3/8~10mm
inner diametre, as well as being 3/8~BSP. I have it laying in my hand with a steel rule across it

, I'm not saying they ALL are. if you have the original, dig it out and check what yours was...
I always thought they were 1/2(12mm inner) but I saw on a Web site that they were 3/8(10mm inner) and checked, low and behold!! 3/8!!...
I was thinking of getting a 1/2inch barb to go on there, but I'll settle for a 5/8

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The barbs on it are 3/8" inlet and 1/2" outlet. Here look at this Eheim 1250
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Sounds like they're quoting the thread size!.