I thought I was going to see it stretching and failing, nothing to see here

So paint the hook at the latch as a precautionary warning.

I wanted to see it break but it was still interesting AF.

I took a millwright 16 and osha 30 course, they should show a video like this to explain the dangers of overloading hooks also

This tip, by a few suppliers, come painted by default. It should be a requirement of standard.

You couldn’t show the overload process?

A hook may be rated for 5 tons, but that doesn't mean it will break at 10, 15, or even 20 tons. It depends on the fatigue life of the hook at its rated load, how many load-unload cycles it has seen in service, the factor of safety against fatigue failure at the rated load, etc. It might be designed to withstand 5 tons with a factor of safety of 3 over 10000 cycles. Statically, it may be able to hold 13 tons before yielding, and it might break at 18 tons. It all depends on the grade of steel and heat treatment.

I will mark my hook from now on. Great information 👍👍

You can fix that shyt with a red marker...

Thanks very educational to me cause I am a crane operator which is good to know the hook block will stress out. 👍👍

what you're discussing is the difference between plastic deformation (what you see by the red line) and elastic deformation (what happens when you load the hook and it comes back to the red line when you unload it). Elastic deformation shortly leads to rupture (well kinda shortly) but if you unload before rupture, the steel returns back down the load/deformation path to zero load. The next time you load the steel, it travels back up the same curve, which is offset a bit to the deformation direction, meaning you get to elastic deformation more quickly. If you stay within the elastic limit of the steel, theoretically, you can load/unload all you want. If you travel into the plastic deformation zone, your cycles of load and unload remain the same, but the magnitude of yield reduces and the load difference between yielding and rupture reduces. However, if you only to the plastic loading once, the hook should be ok for continued use, depending on how far you travel into the plastic zone. Steel attachments are usually rated at 20% to 25% of their rupture strength, you hook was rated at 10000 lbs meaning it's rupture strength should be 40000 to 50000 lbs, you made it to 30000 lbs, meaning you were coming up against the rupture strength of the hook, meaning your cycles in this zone next time are significantly reduced. (this, by the way, is strain hardening of the steel).

Thank you. And not just in overhead.

Expected to see some shit get broken and casualties. Got this, thanks a lot.

‘Never overload your hoist!’ I’ve always said that!

WE WANTED TO SEE IT SNAP!!

i spent 40 years repairing hoist of all kinds. its good to see this info being shared.

Agreed ✅ It Would be Nice if There were Location Marks for that Reason

Yeah that was a great VISUAL example of a hook failing! Tanks!

The annual inspection performed on the hoist is supposed to identify a stretched hook by measuring the hook opening and comparing to mfg spec. Good quality hooks have marks cast into the hook that you can measure spread.

Safety video. Thanks. A lot of people are stupid when it comes to lifting and weight bearing capacities. Darwin.