28-M30 CCPU hinge nut size

[SeaSlugs]

Ive searched and came up empty but can anyone verify the size of the square nuts that hold the door hinges onto the door post? I think they are 9/16" square...

These are the square nuts inside the door post channel that hold the middle and bottom hinges to the cab. The top is threaded holes in the hinge.

Gotta make a special wrench to hold them (cant find a 60* open or 8 pt box end wrench anywhere) and im 90% sure they are 9/16" but dont want to waste time making something that is too big/small...

Thanks in advance!

[Dan Partain]

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The original nuts on my cab hinges fit a 1/2" open end wrench.
-DAN