Quote:
Originally Posted by Bob662
My 25' FC, perfectly level, is 20-1/2" from the ground to the top of the ball. That's not loaded with water, etc. for camping. So if you get a hitch that'll afford you this measurement as sort of a mid-setting, you'll be able to fine-tune the hitch height for your trailer in whatever configuration you wish.
Yes, you'll need a 2-5/16" ball with a 1-1/4" shank.
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And the
nut on that ball will require 450 ft.lb. of torque. (dry)
Which is a hell of a lot of '
grunt' for anyone with only a torque wrench that goes to 250 ft. lb. However.............
It is possible to get it pretty well that tight.
Since only 10% of the torque is used to actually tighten the bolt, the rest is lost in friction. 50% in the threads, 40% at the nut face. So.......
(Source: Premier Fastener Corp. Cleveland.)
Using C-5 Colloidal Copper, or 'Nevr Seize', or similar 'extreme pressure' lube; you coat the face of the nut, and the threads generously with the 'goop'.
This means that you reduce the torque by about 40% from the dry spec. (450)
This will give you about 270 ft. lbs. of torque.
Using your 250 wrench at max setting, tighten the nut in a
smooth even stroke.
This will give you
almost the bolt tension desired by spec.
And this is as
close to perfect as 'damn is to swearing'.
If you
desire to have it perfect, Then use a 'Johnson Bar' to tighten it about 1/4 of a flat.
But really!
Do you need it?
The bolt tension achieved is way better than what some 'grease monkey' using an
impact gun will get. And the chance of failure is virtually nil.