In case of any confusion a USA 2" ball, should not and will not, fit on to to a trailer with a 50mm socket
I imported a 2"Curt 45592 "Euro ball mount" from the USA, and it is simply too large for the ball to go into the socket. I have access to two trailers, one new one must be 50mm (made in Wales) and the other is cast and stamped 50mm. It will fit in neither. It is not a case of it not locking, but the ball not pushing in.
In theory it is 0.8mm larger but that seems to be enough. The 2" has a flat piece on top like EU models.
My USA manufactured tow hitch (they do not make it any more in the EU for my vehicle), has a square hole for the attachment which is 1 & 1/4 inch square (some are 2" square) I needed to purchase a 1 1/4 inch square end for a ball mount (not a Euro mount ball mount) and then purchase a 50mm ball in the EU which mounts in the 3/4 inch (19mm) hole. Most free fit balls that are available have 22mm M22 thread, so they will not fit.
Beware balls with a 19mm thread are often light weight designed for quad bikes etc. so make sure to get one rated for vehicle towing.
See here for the options:
www.curtmfg.com/Category/154/1%201%7C4%20IN%20Ball...s
Do NOT buy the Euro type as they will not work with 50mm
So to summarise, if importing a tow hitch from the USA to EU, you need to NOT buy a ball from a USA source, instead buy "ball mount" and get a ball in the EU that is true 50mm and designed to mount in the correct size round hole and fit it to it.
Ideally you should only souce tow bars in the EU, as they should comply with relevant EU leglisation and not have imperial and non typical ball sizes.
Others discussed this in Australia:
caravanersforum.com/viewtopic.php?t=34509
General info on tow hitch sizes here:
en.wikipedia.org/wiki/Tow_hitch
I will try take a photo and link to it at some stage.
Other things to consider is the ball height, and the trailer should be level and have the correct 'nose weight' so you need the correct rise or fall adapter, so the trailer should be consulated for the correct height and matched to the vehicle.
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