Breaking Load of Chain

I think it's 5x, but it may depend on local regulations.

Alternatively, you find a chain with SWL (safe working limit) ≥ 3751kgf, in which case the safety factor has already been accounted for.

It also depends on how the chain is arranged; i.e., one hook or more, lifting angle(s), etc.

how am I going to select the chain by having the eight alone in hand?

Do not even try. Get someone who is qualified to do it, someone who can at least read post #1 and understand it.

Well, the lifting equipment details will be in the General Register for the facility, alongside which will be the periodic inspection reports from the Engineer/Surveyor from the company providing collapse insurance cover for using the equipment. These reports should contain the latest test records that this individual witnessed on the insurer's behalf. So it should be a simple matter to look up the serial number of a suitable piece of equipment in the register that is within its insurance inspection repeat period and tested acceptably last time, select that equipment from the carefully-organised storage facility that is used only for lifting equipment, and put the item to use with all confidence.

No-one on CR4 can see what equipment is available, nor the Register and the insurance inspection test reports, other than the Original Poster.

Wrong!

The breaking load is not what is wanted.

The safe working load [SWL] is what is wanted.

Look at the tag located in the box, pail or on the end of the chain. Working strength and breakage strength should be indicated there.

Good Luck, Old Salt