2003 V40 Rear Axle Nut

[robnix]

Need to replace the rear wheel bearing. One problem though is that I've been looking for the size of the rear axle nut and can't seen to find the exact size. I'd hate to have the car off the ground with the wrong size socket. My best guess is that I'll need a 30mm socket for this. Am I correct or is it a different size?

Thanks!