A shackle should never be loaded at more than ? .

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Multiple Choice

A shackle should never be loaded at more than ? .

Explanation:
The main idea is that shackles are built for a straight, inline pull through the pin; introducing angle between the load directions creates side loading that reduces the effective capacity and increases risk of pin bending or opening. The maximum safe angle is 90 degrees, because beyond that the load would be too off-axis for the shackle’s design to handle safely. So you should never load a shackle at more than 90 degrees. The smaller angles listed are still within the safe range, but 90° is the upper limit.

The main idea is that shackles are built for a straight, inline pull through the pin; introducing angle between the load directions creates side loading that reduces the effective capacity and increases risk of pin bending or opening. The maximum safe angle is 90 degrees, because beyond that the load would be too off-axis for the shackle’s design to handle safely. So you should never load a shackle at more than 90 degrees. The smaller angles listed are still within the safe range, but 90° is the upper limit.

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