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Old 18th December 2015, 14:48   #16
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Default Re: A Mercedes GL, 2 Grand Vitaras, a Sugarcane farm and a tow cable

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Originally Posted by Desmosedici View Post
Hi Doc,

Why 3/4" and why not D shackles. I googled the design and found it nearly similar except for the fact that the 3/4" are closer at the ends. Any particular reason? Thanks.
3/4" is basically the diameter of the pin.

Let's talk a bit about shackles.

Here you need to understand working load limit (WLL) which is stamped onto it and the safety margin.

Good quality shackles have a safety margin of 6 times.

So a 3/4" shackle that is rated at 4.75 tons will have a failure point of 6*4.75 = 28.5 tons!!!

The D shackle has two sides straight and is good for straight loads and not good for angular pulls. Also the strap gets compressed a lot in a D shackle.

However, in a bow shackle, the design helps distribute the load when forces are applied at an angle and the strap doesn't bunch up either.

Hope this answers your query?

Here's an image from google image search:

A Mercedes GL, 2 Grand Vitaras, a Sugarcane farm and a tow cable-differencesbetweenbowanddshackles.jpg

Source according to Google: http://www.beyondrigging.com

Last edited by Tejas@perioimpl : 18th December 2015 at 14:49. Reason: corrected a typo
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Old 18th December 2015, 15:08   #17
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Default Re: A Mercedes GL, 2 Grand Vitaras, a Sugarcane farm and a tow cable

Quote:
Originally Posted by Tejas@perioimpl View Post
3/4" is basically the diameter of the pin.

Let's talk a bit about shackles.

Here you need to understand working load limit (WLL) which is stamped onto it and the safety margin.

Good quality shackles have a safety margin of 6 times.

So a 3/4" shackle that is rated at 4.75 tons will have a failure point of 6*4.75 = 28.5 tons!!!

The D shackle has two sides straight and is good for straight loads and not good for angular pulls. Also the strap gets compressed a lot in a D shackle.

However, in a bow shackle, the design helps distribute the load when forces are applied at an angle and the strap doesn't bunch up either.

Hope this answers your query?

Here's an image from google image search:

Attachment 1451456

Source according to Google: http://www.beyondrigging.com
Thanks Doc. Appreciate the crisp explanation. Thats some very good info that you have shared.
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Old 20th December 2015, 19:15   #18
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Enjoyed the day. More people join in on our little fun days.
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