Never place side strain in opposite directions on a shackle and never exceed ____ degrees of angle.

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Multiple Choice

Never place side strain in opposite directions on a shackle and never exceed ____ degrees of angle.

The key idea here is how side loading affects a shackle. Shackles are designed to carry load along the pin axis, so when two sling legs pull in different directions, they create a side load on the shackle. As the angle between those legs increases, the resultant force on the shackle pin grows, which puts more bending and shear on the pin and reduces the effective capacity. Keeping the included angle at or below 120 degrees limits this side load and helps maintain the shackle’s designed strength. If you tried to lift with a larger angle, the risk of pin damage or failure rises, which is why 120 degrees is the recommended maximum. Smaller angles keep side loading lower, but 120 degrees is the standard upper limit.

The key idea here is how side loading affects a shackle. Shackles are designed to carry load along the pin axis, so when two sling legs pull in different directions, they create a side load on the shackle. As the angle between those legs increases, the resultant force on the shackle pin grows, which puts more bending and shear on the pin and reduces the effective capacity. Keeping the included angle at or below 120 degrees limits this side load and helps maintain the shackle’s designed strength. If you tried to lift with a larger angle, the risk of pin damage or failure rises, which is why 120 degrees is the recommended maximum. Smaller angles keep side loading lower, but 120 degrees is the standard upper limit.

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