3/4" to 1" towbar adapter bushing

[max1008]

I picked up these bushings from Mcmaster-Carr. It found it very hard to find 1" towbar feet and the 3/4" feet are easily available. $13 each.
[h=3]The part number for Mcmaster is 3741K11- Oil-Lubricated Bronze Sleeve Bearing[/h]for 3/4" Shaft Diameter, 1" OD, 1-1/2" Length

 

[Keith_J]

I found the same bushings at Tractor Supply back in 2012, now those parts assortments are no more as TSC. Did an inventory reduction and ended that rack jobber.

These bushings work great, flat towing the M1031 for 1500 miles was relatively easy. They had minimal wear after that trip so they should be good forever.

 

[max1008]

I wasn't sure if this has been covered, but I guess its always good to have an up-to-date part number.

I haven't had a change to check the fitment on an m35 or any other models.

 

[goldneagle]

I got a reducer from Tractor Supply in MS. They had it in the nut and bolt isle. Fit perfect. Using it for M715 tow bar feet so I can use the 3/4" feet along with it. I figure the 3/4" pins are plenty for a M715.

 

[KsM715]

What are you towing with it? I would be careful towing anything large that required 1" pins. Im no engineer but I wonder how much strength your losing by down sizing the pins?

 

[rhurey]

About 40 - 45% for a 25% reduction in diameter IIRC.

 

[goldneagle]

What are you towing with it? I would be careful towing anything large that required 1" pins. Im no engineer but I wonder how much strength your losing by down sizing the pins?

He is towing a M1031.

 

[roveroverme]

Where can I find the feet for the tow bar? mine didn't come with any and was connected straight to the shackles

 

[gimpyrobb]

Where can I find the feet for the tow bar? mine didn't come with any and was connected straight to the shackles

Taylortrading is a member here. Send him a PM, maybe Goldeneagle too.

 

[KsM715]

Check the classifieds and the other usual places. eBay or CraigslistCraigslist

 

[goldneagle]

Where can I find the feet for the tow bar? mine didn't come with any and was connected straight to the shackles

If you have a medium tow bar I have an extra set of 3/4" feet I can sell you. $80 shipped Priority Mail. If you plan to tow a larger much heavier truck you will need a set of 1" feet. I do not have any spare 1" feet.

 

[goldneagle]

Taylortrading is a member here. Send him a PM, maybe Goldeneagle too.

Thank you for the referral. I am goldneagle not goldeneagle

 

[porkysplace]

I wasn't sure if this has been covered, but I guess its always good to have an up-to-date part number.

I haven't had a change to check the fitment on an m35 or any other models.

I don't think a 3/4 inch pin would be safe on a M35 or larger. CUCV 's and similar size trucks it will probably work.

 

[roveroverme]

this is what I have… It is 64 inch long but extends, the fork for the feet is 1 1/4", is that a medium tow bar?

 

[Recovry4x4]

For your consideration on pin size. The length adjustments on the medium towbar use 3/4 pins. Just sayin.

 

[swbradley1]

For your consideration on pin size. The length adjustments on the medium towbar use 3/4 pins. Just sayin.

People seem to forget that little fact.

 

[goldneagle]

People seem to forget that little fact.

Point well made sir. I do wonder if there are different forces applied tot the pins at the shackle mount than at the tow bar extension point. I am sure an engineer could shed some light on that. There is no twisting force applied at the extension but there might be a twist at the shackle mount when you make turns with the lead vehicle.

 

[swbradley1]

I suspect that because the bar connects at the pintle at an angle there is more shear forces at play on the outside edge of the feet on the 1 inch pins. One side of the pin is trying to shear towards the back on the inside and towards the front on the outside.

Someone with a finite element modeling program on their computer could do an analysis for us.

 

[max1008]

How heavy are modern up-armored HMMV? At least 15k? They are use 3/4" pins.

 

[Keith_J]

The forces are the same, double shear. No bending in the horizontal plane as they pivot in that axis. When lead vehicle is turning, the double shear is partially reversed which in no way compromises strength. Now if one foot fails, a much different situation happens.

Check tow bars at every stop and remember safety chains.