1/2"-20 x 2" Press-In Trailer Wheel Stud
PN: LB2.0 or 7-246-01
(This is for one stud, buy as many as you need, free shipping on the extras)

If your Studs are rusted so bad you can't use them, they were stripped or broken during maintenance, you can go ahead and pop these studs in as long as there are 20 threads counted in a inch (1/2"-20) and 1/*2" dia, and it measures the same lengths as listed below

Features & Specifications:

Finish:  Zinc Finish

Wheel Stud Overall Length: 2"

Thread Length: 1.2"

Insert Length: 1/2"

Knurl Diameter: .545"