The Secrets of Lifting Hardware (Part 3) | JIS Standards for Shackles and Load Capacity

Hello, everyone.

This is Enta.

Recently,The "Romero Special" is all the rage at the police station.It seems that...

I used to love it, too!

New Japan Pro-Wrestling is the best!!


But that's beside the point.

The Secrets of Lifting Attachments (Part 1)

The Secrets of Lifting Attachments (Part 2)

"Shako" in industry jargon?

That's right.

You use shackles, right?

Just wondering—don't the slope contractors usually buy their shako at home improvement stores?

Ours was from a home improvement store, lol.

Actually, this clamp has its load capacity listed, but,That's suspicious, lol.

It’s abnormally cheap for that, but it says something like “1.5 metric tons” for the mantis shrimp in the photo.

However, it doesn't list the manufacturer's name or anything like that. The performance testing is probably a bit questionable, too.

Therefore, if you do use it, we recommend using it with a load of less than half its capacity.

 

Conversely, in the case of JIS standards—which are domestic standards—it appears that there is a safety margin (strength) of at least twice the specified performance.

But, of course, you can't hang it higher than what's listed, lol.

The manufacturer's official blog is actually pretty interesting.

Taiyo Seiki Kogyo Co., Ltd. Official Blog

 

One thing to keep in mind when using the "Shako" tool from a home improvement store is that it's sensitive to vibrations.

That's because, compared to JIS-compliant parts, the thread pitch is coarser.

Since the threads are coarse, the pins tend to come loose due to vibration, right?

So, to keep the pins from flying off, thread a cable tie or something similar behind them

If you secure it to the main body of the shrimp, the pin is less likely to fly off.

Please exercise extra caution when using this with a suspended drilling rig.

JIS fasteners generally won't come loose if you tighten them securely, but for safety's sake, you should still secure them with ties, or

At our house, we try to use items with split pins whenever possible.

 

See you later.

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