Are Jack Mount Threads of A-Frame Trailer Coupler # CA-5210-B Fine or Coarse Thread

Question:

Found some 5/16inch bolts that I thought would fit, but they do not appear to want to thread. Is this a fine/course thread? Metric? Am I supposed to tap this myself? Confused.

asked by: Dan

Expert Reply:

The threaded bolt holes on the jack mount of the A-Frame trailer coupler part # CA-5210-B are coarse thread.

It's actually pretty interesting that the holes are threaded. Nearly every single jack mount like this is not threaded and is designed for nuts and bolts instead. I still think this would be the preferred method.

expert reply by: Jameson C