In a vertical lift, a shackle should be loaded to what percentage of its rated capacity?

In a vertical lift, a shackle should be loaded to what percentage of its rated capacity?

• A. 80%
• B. 100%
• C. 90%
• D. 85%

Answer: (B)

In a vertical lift, the pull is aligned with the shackle’s pin axis, so the full rated capacity is the safe load. The shackles’ rating assumes straight-line loading; with a vertical lift there’s no side or angular force to reduce capacity, so you can apply up to 100% of the rated capacity. In real use, dynamics and shock loads matter, but for a straight-up lift the maximum safe load equals the shackle’s rating. If the lift were angled, the effective capacity would be less due to cross-loading and angles.

In a vertical lift, the pull is aligned with the shackle’s pin axis, so the full rated capacity is the safe load. The shackles’ rating assumes straight-line loading; with a vertical lift there’s no side or angular force to reduce capacity, so you can apply up to 100% of the rated capacity. In real use, dynamics and shock loads matter, but for a straight-up lift the maximum safe load equals the shackle’s rating. If the lift were angled, the effective capacity would be less due to cross-loading and angles.