Good Sam Club Open Roads Forum: Towing: torque for shank bolts
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 > torque for shank bolts

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noonenosthis1

northern california

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Posted: 04/02/19 12:39pm Link  |  Print  |  Notify Moderator

Hi all,

I've gone from an Excursion to an F350 for towing. The F350 is taller than the Ex so I've turned my hitch upside down and now I need to retorque the shank bolts. What is the correct torque for those bolts?

Thanks

rdhetrick

Texas

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Posted: 04/02/19 01:10pm Link  |  Print  |  Notify Moderator

832.42729 somethings.

Ok, probably not.

Why not ask the manufacturer of the hitch?


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TBammer

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Posted: 04/02/19 01:41pm Link  |  Print  |  Notify Moderator

Get the biggest breaker bar you can find for the socket that fits the bolt. Then get a 4 foot length of cheater pipe to go over the breaker bar. Then have your biggest/strongest friend lean on it until he can't lean no more. But my last reading was like 300-400 ft/lbs.


2016 Chevy 2500 HD, 6.0 gasser, 4.10 dif
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Reese Pro-Series WD Hitch

jfkmk

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Posted: 04/02/19 02:39pm Link  |  Print  |  Notify Moderator

TBammer wrote:

Get the biggest breaker bar you can find for the socket that fits the bolt. Then get a 4 foot length of cheater pipe to go over the breaker bar. Then have your biggest/strongest friend lean on it until he can't lean no more. But my last reading was like 300-400 ft/lbs.

Or you can take it some place where they actually use a torque wrench.

BarneyS

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Posted: 04/02/19 03:24pm Link  |  Print  |  Notify Moderator

250 lb-ft for most manufacturers.
Barney


2004 Sunnybrook Titan 30FKS TT
Hensley "Arrow" 1400# hitch (Sold)
2019 Ram Limited 1500, 5.7L Hemi, 4x4, SB
Not towing now.
Former tow vehicles were 2016 Ram 2500 CTD, 2002 Ford F250, 7.3 PSD


delwhjr

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Posted: 04/02/19 03:35pm Link  |  Print  |  Notify Moderator

If its an equal-i-zer the manual recommends 320 ft/lbs


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BenK

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Posted: 04/02/19 04:02pm Link  |  Print  |  Notify Moderator

Standard is by ball shank dia, but best to check your ball's OEM specification

https://www.etrailer.com/question-109595.html

Quote:

Curt recommends the use of 250 ft/lbs of torque when tightening the nuts of their hitch balls with a 1 inch diameter shank like the part # C40034 that you referenced.

The general rule is for a 3/4" shank tighten to 150 ft/lbs For a 1" shank tighten to 250 ft/lbs, and for a 1-1/4 inch shank 450 ft/lbs.



Ops...reread the OP's comments...guess it is the WD hitch head bolts...use the OEM's spec


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SDcampowneroperator

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Posted: 04/02/19 09:29pm Link  |  Print  |  Notify Moderator

asme spec. 250 lb./ft for 3/4" nc gr. 5 dry bolt in that application. Torque is not an issue as much as shear load because the bolt is not so much a connection as it is subjected to side shear load. Lubes reduce torque spec. depending on type. Machine oil to moly paste, makes a big difference. Moly can reduce torque by 50 %

Grit dog

Black Diamond, WA

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Posted: 04/02/19 11:36pm Link  |  Print  |  Notify Moderator

Scientifically, as tight as I can get with a 1/2 drive ratchet or my air impact on middle setting. Couple hundred ft lbs.


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TBammer

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Posted: 04/03/19 06:56am Link  |  Print  |  Notify Moderator

jfkmk wrote:

TBammer wrote:

Get the biggest breaker bar you can find for the socket that fits the bolt. Then get a 4 foot length of cheater pipe to go over the breaker bar. Then have your biggest/strongest friend lean on it until he can't lean no more. But my last reading was like 300-400 ft/lbs.

Or you can take it some place where they actually use a torque wrench.


Yeah, or you can do that, which is prolly the best move.

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