Proper chain size and grade?

[N80]

I've got a 19' flatbed trailer that I use to tow my car (3300#) to the track and occasionally tow my tractor (4800#). For the car I have been using tow straps front and back. The straps in the front are a pain to use because of short length and low clearance. I see a number of guys using fixed length chains up front. They hook the car to the chains up front and let the car roll back against them to make them tight, then they cinch the car down even tighter using ratchet straps in the rear.

So my question is, what size and grade chain do I need for this sort of load (3300# car).

Thanks for any advice you can give me.

 

[RedNeckRacin]

why don't you use tire bonnets for the car? The suspension bouncing against the tie downs creates alot of force. It can also cause them to come unsecured.

Any grade 70 chain that meets the load requirements is fine.

 

[George2615]

Grade 70, 5/16" chain will be fine for your towing needs. I use 4 chains, 2 front, 2 back, plus each implement has to be secured as well such as bucket, rear mower, etc.
For cars I bought several 3' straps that go around the axles then hook the chains to the straps. Straps are similar to these.

 

[N80]

Grade 70, 5/16" chain will be fine for your towing needs. I use 4 chains, 2 front, 2 back, plus each implement has to be secured as well such as bucket, rear mower, etc.
For cars I bought several 3' straps that go around the axles then hook the chains to the straps. Straps are similar to these.

Thanks guys. I use the straps shown above looped through the wheel. Attaching to front suspension points with a strap like this is possible but difficult due to clearance. Tire bonnets do not work well because of clearance issues with the fender and front bumper (wide tires, very low ground clearance). Suspension movement can be an slight issue but not much. There is not a great deal of suspension travel and it is stiff. I'm no expert in all this but a lot of seasoned track rats and racers tie down the way I'm describing although even amongst these folks there is debate about suspension travel. One racer claims they hit a bump that blew out the shocks and struts of his race car while it was being towed.

 

[sdef]

Here is a good chart. For you with a 4800# tractor= 3/8" G70 chain
Working Load Limits of Chain

 

[tcartwri]

3/8" G70 is what you're going to find at the box store. It is by far the most commonly used.

 

[N80]

Tractor Supply has bulk 5/16 G70 too.

 

[prichard]

5/16 is more than enough unless you plan on only using 1 chain

 

[George2615]

5/16 is more than enough unless you plan on only using 1 chain

Agreed, a 5/16" with a WLL of 4700 lb. per chain at each corner (4 chains) is more than enough to hold the tractor.

 

[N80]

Agreed, a 5/16" with a WLL of 4700 lb. per chain at each corner (4 chains) is more than enough to hold the tractor.

For the car it will be two grade 70 5/16" chains up front and two high quality ratchet straps cross in the rear. I'll buy chain and hooks tomorrow. The grade 70 hooks are like $12 each. The chain is like $4 a foot. I'll only need two four foot chains but will need 4 hooks so its going to be close to $90. But, I want to do it right and I think it will be easier than using the ratchet straps up front.

Of course it just now occurred to me that I could just set the front ratchet straps at a set length and do the same thing as the chains. I'll have to think it over.