Tire Carrier Hinge

[cbbr]

I am working on a carrier built out of 3/16ths 2" square tube.

My thought is to sleave a 1 inch grade 8 bolt with DOM. Weld a piece of the DOM into the main bumper and the carrier. Since it won't be opened that often, a lttle grease on the bolt should do.

Anyone done this?

Anyone know the shear strength of a 1 inch grde 8?

Would a grade 5 be better (less brittle)?

Any drawbacks?

 

[shane74]

If I am envisioning your setup correctly, it will wobble like a sumb*tch. You'd be better of to get a trailer spindle setup out and use that. You can get them cheap from Northern Tool.

 

[cbbr]

I am looking at DOM with an ID of 1.06 and a 1" grade 8. The carrier will also be bolted down on the other side.

I have read a lot about the spindle setups and the rockstomper hinges, but people have had problems with them breaking.

 

[ntsqd]

That .060" slop is too much. As previously predicted I also predict that it will wobble. Bolting it on the other side will only help that side.

If you're determined to go in this direction I highly suggest that you buy a pair of flanged bronze bushings with a 1" ID and size the steel tube for them to be a light press fit. Can get them from your local bearing house.
Nominal Shear strength in steel is roughly 57% of the tensile strength.

 

[cbbr]

My other choice is 1.01. If slop is the only downside, that may help some.

 

[shane74]

I am looking at DOM with an ID of 1.06 and a 1" grade 8. The carrier will also be bolted down on the other side.

I have read a lot about the spindle setups and the rockstomper hinges, but people have had problems with them breaking.

IIRC, they use a 1.5" dia. spindle. Go with the 1.75" dia spindle and larger OD dia. bearings. That will help a lot with the wobble and should prevent breakage.