What Size Hardware is Used to Install Convert-A-Ball 5th Wheel to Gooseneck Adapter

Published 05/23/2014

Question:

What are the nut sizes. I am removing this from a fifth wheel that i bought. I need to know what to buy

asked by: Oliver J

Helpful Expert Reply:

If the Convert-A-Bll 5th wheel to gooseneck adapter # CAB-C5G happens to be bolted to the bottom of the trailer pin box, then those are 1/2 inch bolts. The jam nuts on the side are sort of an odd size and Covert-A-Ball recommends a large crescent wrench. The nuts are 1.1 inches wide. The bolts that fit through them are 3/4 inch bolts.

The square head end of the bolts would also work best with a crescent wrench but a 19mm open end wrench fits pretty well.

The collar on the inside that holds the king pin on the trailer uses 3/8 inch allen screws.

expert reply by: Michael H