They are very snug. You could also grind down some of the heat sink with a belt sander.
https://squareup.com/market/meowerz/bitmain-antminer-u
Topic: Antminer U2 dimensions (Read 947 times)
Or get a hand full of 6-inch USB whip extensions. But you still need to keep in mind the power available from the adapter to each device.
Thanks for the reply. My hub is a D-Link DUB-H7, so it looks like I could only fit four.
Really depends on the hub. I can see why you'd want to know the dimensions (Size: 60 mm x 25 mm x 27 mm) for that reason, but then you'd also have to find out the dimensions of the hub.. not sure how many actually specify the inter-port spacing 
You will typically need to skip a port or the heat sink will be against the electronics of the next one. If the ports are horizontal row you will need to skip one because they are to wide. Remember these will require a self powered hub and should count each one as using 500 mA each. Most A/C Adapters included with low cost hubs are only 2000 mA.
Can anyone tell me if Antminer U2 ASICs can fit next to each other in a USB hub, or if they need to leave an extra port as room for the heatsink?
Jump to: