Hi guys, we're going to make our own wheels, and before I buy the wrong things, can I buy any 3/8UNF size nut? It would seem there are loads of slight variations, am I safe with anything labelled 3/8UNF?

I am looking at these (or similar) in particular: http://www.ebay.co.uk/itm/3-8-UNF-25mm- ... 5891b47a4b

Thanks.