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 > Torque Wrench for WD Hitch nylock nuts

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Super_Dave

Harrisville, UT

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Posted: 10/29/20 07:49am Link  |  Quote  |  Print  |  Notify Moderator

360 ft-lbs and nylock nuts made me laugh.


Truck: 2006 Dodge 3500 Dually
Rig: 2018 Big Country 3155 RLK
Boat: 21' North River Seahawk


BenK

SF BayArea

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Posted: 10/29/20 08:48am Link  |  Quote  |  Print  |  Notify Moderator

Me too...didn't know they made them that big and wonder if they provide enough "locking" force

Think a split-ring should be added


Super_Dave wrote:

360 ft-lbs and nylock nuts made me laugh.



-Ben Picture of my rig
1996 GMC SLT Suburban 3/4 ton K3500/7.4L/4:1/+150Kmiles orig owner...
1980 Chevy Silverado C10/long bed/"BUILT" 5.7L/3:73/1 ton helper springs/+329Kmiles, bought it from dad...
1998 Mazda B2500 (1/2 ton) pickup, 2nd owner...
Praise Dyno Brake equiped and all have "nose bleed" braking!
Previous trucks/offroaders: 40's Jeep restored in mid 60's / 69 DuneBuggy (approx +1K lb: VW pan/200hpCorvair: eng, cam, dual carb'w velocity stacks'n 18" runners, 4spd transaxle) made myself from ground up / 1970 Toyota FJ40 / 1973 K5 Blazer (2dr Tahoe, 1 ton axles front/rear, +255K miles when sold it)...
Sold the boat (looking for another): Trophy with twin 150's...
51 cylinders in household, what's yours?...

dolfinwriter

El Cajon, CA

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Posted: 10/29/20 01:33pm Link  |  Quote  |  Print  |  Notify Moderator

BenK wrote:

Me too...didn't know they made them that big and wonder if they provide enough "locking" force

Think a split-ring should be added


Super_Dave wrote:

360 ft-lbs and nylock nuts made me laugh.


There is also a flat washer and a split ring lock washer.

FWIW, the nuts that hold together some sea water components in nuclear submarines that have to withstand submergence pressure use nylock nuts on bolts that are at least two inches in diameter. These and all fasteners and software for systems that are exposed to submergence pressure are also QA'ed to the nth degree because of the Subsafe program implemented after we lost submarine Thresher. The only numbers I can state are what's been declassified at >800 ft depth, and 44#/100 ft of depth. That's 352 psi. Doesn't sound like a huge amount, but think of containing that kind of pressure in components the size of a pickup. Force = Pressure X Area.

So yeah, they do make them much larger than this.

I said before that I don't torque spec every single thing I work on, but on this hitch, it seems kind of important to have it tight enough but not overtight. One of the reviewers for this hitch said that he used what we called a "calibrated elbow" approach, and it came loose on him down the road and started swaying when trucks passed. He was smart enough to check it and had tools to tighten it, but would it have come loose at all if he had done it right?

dolfinwriter

El Cajon, CA

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Posted: 11/08/20 06:53pm Link  |  Quote  |  Print  |  Notify Moderator

The trailer and its contents are in Kansas now, and I am back in SoCal finishing packing, purging and working on my house. I'm thankful for the sway preventing hitch after driving though some beastly crosswinds in the mountains of I-8 east of San Diego, and in Arizona and New Mexico east of Flagstaff. Mine tracked straight and smooth the entire way.

Saw an 18-wheeler on its side yesterday I believe near Winslow. I wondered if it was the same one I saw earlier in the day with the rear of its trailer crabbing sideways as much as 2 feet in the crosswinds. I saw a lot of RV trailers swaying a lot as well. Some of those were 5th wheel.

On the way to Kansas, I stopped for gas at a Love's, and I happened to park next to someone pulling a camper trailer using the same hitch I have. I asked him how he torqued it and he said he guessed. He had two small boys in the back seat of his tow vehicle, and he's guessing at things like this. He also had the trunnion bars upside-down, so he doesn't follow instructions well.

JRscooby

Indepmo

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Posted: 11/09/20 05:17am Link  |  Quote  |  Print  |  Notify Moderator

BenK wrote:

Me too...didn't know they made them that big and wonder if they provide enough "locking" force

Think a split-ring should be added


Super_Dave wrote:

360 ft-lbs and nylock nuts made me laugh.


I'm not real found of split washers on big stuff that is real critical to stay tight. Have found to many cracked. If the pieces fall out...
I prefer a piece that has tabs that bend to the flat, or wire thru fastener.
On things like hitch or lugnuts, where I will be checking to be sure not backing off, I often use paint mark where fastener meets part so I can tell at a glance if moved in relation to each other.

CharlesinGA

South of Atlanta, Georgia

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Posted: 12/05/20 08:03pm Link  |  Quote  |  Print  |  Notify Moderator

Way late here, but the instructions the OP posted said a torque wrench capable of 380 lb/ft. They didn't say the bolts were supposed to be torqued to that, just that the tool needed to go that far. Typical torque on the two 3/4 thru bolts on most hitches is 260 lb/ft, some may go a little higher, but 380 is pretty high for the bolt, I think someone pointed out that was the max on a grade 8 bolt, most hitches come with grade 5. Thats all Blue Ox specifies, but grade 8 won't hurt anything. I have looked at the instructions for Equalizer, Blue Ox and a couple of others, they all specified 260 or close to that number.

The guy at a semi shop won't mind doing something like that. I am sure they prefer you to do it right than to have it fall apart on the road. I have a torque wrench big enough to do the ball nut, generally 450 lb/ft.

Charles

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