Kar, thank you for your question. We don’t recommend dismantling our caster, but it has a 5/8” bore diameter.
These are actually manufactured in China.
Dave, thank you for your question. The bolt size is dependent upon your application. The whole size for the bolt or screw is 3/4" x 7/16".
Rosoco, thank you for your question. The width of the bracket is 4-1/2". The width of the bolt that holds the bracket to the wheel is 5-1/2".