Chain Question?

[JOHN1]

Really did not know where to ask this but from time to time I use "chain" for towing etc; and have welded it' links for various projects, as we all have I guess.

When a " chain size'' is stated as 5/16" for instance, is this the thickness of the link itself.

I ask this as I have always seem to buy the wrong "clevis" hook.

Sorry if this is OT.

Thanks
John

[David R]

Yes, the 5/16 is the diameter of the wire or rod used to make the chain.

There is a slip hook and grab hook.

David

[JOHN1]

David

How do u use a grab hook.

John

[Oldiron2]

A chain is a tool, so I guess this belongs here. David must be busy, so I'll answer.
A slip hook has a relatively large, round opening and a chain can slide or turn in its opening, while the grab hook has a narrow slot which is only slightly wider than the link 'rod' so will stay hooked on that link because of interference with the next link which is perpendicular.
Thus, with a grab hook the chain can be run around or through something, then back on itself and hooked where ever is needed to get the correct length.
I've also used grab hooks for pulling flat edges of metal, at times.
A clevis is a 'U' shaped shackle with the ends drilled for a pin or bolt; I use one on my winch cable, with the 'U' section through the cable loop, and the bolt through the hook's eye.

[farmersamm]

If you really intend to put some stress on it, and for safety's sake, you probably should spend the extra bucks and get grade 70 chain. Various grade of "test" chain usually aren't too safe for heavy use.

[denrep]

Originally Posted by JOHN1

How do u use a grab hook?....

For maximum capacity, either style hook must be loaded in a straight line, with the load concentrated at the saddle of the hook. Hooks pulled sideways, or jammed, have greatly reduced capacity.

The grab hook must always saddle both sides of a link, never hook the tip into the "eye" of a link.

Good Luck

[Bob]

If it's a chain where life and limb is at stake, I wouldn't weld it. They make graded chain splices. They look like double ended clevises with pins sized to the chain.
I second buying grade 70 chain. I use 1/4" grade 70 for most every thing. It's stronger than 1/2" regular chain.

[sunline]

Look for lockalloy splices. Not sure of the spelling but that is what they are called and avoid made in china units. Often center pin wont seat....