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Old 12-05-2013, 04:54 PM   #1
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Question What # rating is needed for snatch block ?

I'm looking to buy a 9000# winch for Christmas and also figured I'd get a snatch block in case I needed a bit more pulling power. I went on Amazon and checked for snatch blocks and find many there with various weights they can handle. I'm looking at one that is rated at 20,000# which in my estimation, should handle everything I'd likely to get into. Need some input

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Old 12-05-2013, 05:01 PM   #2
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Quote:
Originally Posted by krazybob View Post
I'm looking to buy a 9000# winch for Christmas and also figured I'd get a snatch block in case I needed a bit more pulling power. I went on Amazon and checked for snatch blocks and find many there with various weights they can handle. I'm looking at one that is rated at 20,000# which in my estimation, should handle everything I'd likely to get into. Need some input
you are correct a 20,000 lb snatch block should be good.

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Old 12-09-2013, 11:25 AM   #3
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It is not as simple as one may think...

The usage of a snatch block as a mechanical advantage is often not truly understood by new jeepers and can be dangerous if used incorrectly for the amount of total load.

I was a Vehicle Recovery Specialist in the Army back in the day and I have found that the US military FM-20 says it best:

https://archive.org/stream/Fm20-22Ve...ge/n0/mode/2up






You can see the difference in load based on the way it is used....







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Old 12-09-2013, 11:58 AM   #4
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As you can see above, the snatch block point of leverage which is marked "F" and is the fulcrum of the lever created by the snatch block is on the outside edge on fig. 6 as opposed to being on the center pin of the block as in fig. 5. This simple diagram demonstrates both mechanical advantage, and reduced stress on the block.

I would suggest your 'kit' includes enough gear to establish a rolling block second class lever scenario regardless of the rating of your snatch block.
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Old 12-09-2013, 06:37 PM   #5
Guesses a lot ;)

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Quote:
Originally Posted by CJ5_fan View Post
The usage of a snatch block as a mechanical advantage is often not truly understood by new jeepers and can be dangerous if used incorrectly for the amount of total load.

I was a Vehicle Recovery Specialist in the Army back in the day and I have found that the US military FM-20 says it best:

https://archive.org/stream/Fm20-22Ve...ge/n0/mode/2up






You can see the difference in load based on the way it is used....








^^^^^ ^^^^^

OP, Also keep in mind that you get the most power out of your winch with all the cable ran out. The first layer of cable on the spool is where you actually have 9k of capacity. You will probably have like 4k capacity on the last layer. Or something like that...
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