What size hole on hitch

And be sure to use a locking type pin,those hair pins they provide are a joke.

I personally use a grade 8 bolt and locking nut that is tightened with a wrench and extension bar. Eliminates rattling also.

Ed_Gee wrote:
This is not rocket science. His pin fits everything else he tried except the hole he drilled. Obviously the hole he drilled needs to be enlarged.

I agree with you on this part. About 1 minute with a Dremel tool will probably take care of the problem.

The most common problem with cheap receivers and draw bars, or home made copies, is that they didn't get the hole dead nuts on center, or they drilled from each side instead of through, and the holes are not in alignment. Size isn't usually a problem, because a 5/8" drilled hole (not reamed) will have all the clearance needed.

Those of you who doubt, dig out your dial caliper and go measure a few receivers and draw bars.

K Charles wrote:

Dutch_12078 wrote:
The recommended drill size for a 5/8" (.6250) slip fit pin hole is 21/32" (.6262).

ASME says 21/32 is the right size hole for 5/8 bolt for a close fit but 21/32 is 0.65625

It is not a bolt that is tightened, it is a pin that is loose and takes side loads. With a hole that is larger than the pin, there is a single point contact and that will cause more rapid enlargement. Ideally there should be a size for size fit, but some clearance is necessary due to location tolerances.

No way is any quality receiver made with a 21/32" hole. I don't think you guys have any clue about how sloppy that would be.

This is not rocket science. His pin fits everything else he tried except the hole he drilled. Obviously the hole he drilled needs to be enlarged. I'd go with the additional 1/32" as so many others here have suggested.

Dutch_12078 wrote:
The recommended drill size for a 5/8" (.6250) slip fit pin hole is 21/32" (.6262).

ASME says 21/32 is the right size hole for 5/8 bolt for a close fit but 21/32 is 0.65625

Dutch_12078 wrote:
The recommended drill size for a 5/8" (.6250) slip fit pin hole is 21/32" (.6262).

21/32 = .656. Too loose.

You probably meant 41/64 (.640). Still too loose IMHO.

A 5/8 pin will just be cold rolled steel, and about .622". A slip fit in a .625" hole. And a little use helps too.

16mm would be good. .630". But who has that handy?

The recommended drill size for a 5/8" (.6250) slip fit pin hole is 21/32" (.6262).

Hand held drills will often result in a somewhat triangular shaped hole. For something like a hitch, there is no way I would use anything but a milling machine for proper size and location.

The hole must be larger than the pin. Even a precision milled 5/8” pin will not slide into a precision drilled 5/8” hole. Hammered in maybe. Has to have a little play.