Forum Discussion

dolfinwriter's avatar
dolfinwriter
Explorer
Oct 24, 2020

Torque Wrench for WD Hitch nylock nuts

Is this the right thread for this, first of all?

I'm trying to install a weight distribution hitch to haul my trailer of stuff from east county San Diego California to Kansas. It's a 7' x 14' cargo trailer and about 6500 lbs GTW, and I didn't need much convincing of the need for a WD and sway reduction/prevention hitch.

Here's my problem: I need a torque wrench capable of 380 ft-lbs to torque two nylock nuts. NO ONE has a torque wrench that will go above 250 ft-lbs. I've tried Autozone, Pep Boys, O'reilly, Trailer supply stores, RV dealers, tire shops, Harbor Freight, pawn shops, Lowe's, Home Depot...

How does ANYONE do this? Or is everyone who uses a hitch like this blowing off the torque spec? The BALL is supposed to be torqued to 360 ft-lbs., and LOTS of places sell hitches and balls, but NO ONE has a torque wrench capable of properly torquing it, neither to rent nor to buy or loan.

How does ANYONE do this properly if you can't get this one tool needed to do it right?

What am I missing?

I would greatly appreciate any help in this area.
  • Here is a lever arm that multiplies the torque


    Link to Summit Racing and is $19.99 bucks
    https://www.summitracing.com/parts/oes-24208?seid=srese1&gclid=EAIaIQobChMIjoGE0oHO7AIVJj6tBh2A2AHPEAQYCSABEgKo5vD_BwE

    For some reason the clicky doesn’t work and here is the link
    https://www.summitracing.com/parts/oes-24208?seid=srese1&gclid=EAIaIQobChMIjoGE0oHO7AIVJj6tBh2A2AHPEAQYCSABEgKo5vD_BwE



    Installing wind generators and forgot the big torque wrench back in the shop and all the local hardware store only had 150 ft/lb torque wrenches

    Plenty of steel bar stock, hack saw, Sawzall, sacrificial socket set and a welder did the job

    To double a 150 ft/lb torque wrench you need to double the effective wrench length from bolt center line to the center of the wrench handle. Then whatever the torque wrench setting is doubled (times 2)

    Triple the torque of a 150 ft/lb torque wrench, you need to triple the length from the bolt center line to the center of the handle. Then whatever the torque wrench seething is tripled (times 3)

    The socket set you use must be capable of handling that kind of torque, so maybe a 3/4” square

    We did that in pinch over nite as the windgenerator had to be ‘flying’ by mid nite the next...otherwise we lost money per the contract

    The prices of 3/4” torque wrenches have come down significantly and probably cheaper to just buy one rated for your needs...of course a 3/4” socket set too...
  • You could make an adapter for a 250ft-lb torque wrench. The adapter would be a steel bar with the right size socket welded on one end and a socket welded to the other end to create a 1/2" female drive. For example: my 6014 Proto torque wrench has a functional length of 21.9" when set to 250 ft-lbs (the distance from the center of the handle to the center of the square drive). The calculation for the length of the adapter is a simple ratio:

    21.9"/250 ft-lbs = X/380 ft lbs X = 33.3"
    33.3" - 21.9" = 11.4" = length of the adapter (center to center)

    Set the wrench to 250 ft-lbs and click your fastener with the adapter installed. The adapter needs to go straight out from the end of the torque wrench, not at an angle. If you are using your truck's receiver to hold your hitch head, support it to the ground with a floor jack and load your wrench to the ground, not sideways.

    Or you could buy a 3/4" drive 600 ft-lb torque wrench. You could fabricate a really long cheater bar and load it with a spring scale (95 pounds 4' from the center of the drive).
  • For one time go to a truck stop, otherwise HD, Amazon, etc carry them.
  • Take it to a shop that does tractor-trailer work and have them finish tightening it. You could get a large breaker bar and stand on it after doing the math on how much weight centered where.

About RV Tips & Tricks

Looking for advice before your next adventure? Look no further.25,104 PostsLatest Activity: Jan 24, 2025