Referring to the rigger reference booklet, what is the capacity of 7/8 inch shackle SP anchor type?

• A. 12,000 pounds
• B. 14,000 pounds
• C. 13,000 pounds
• D. 15,000 pounds

Answer: (C)

The value shown for a 7/8 inch SP anchor type is the working load limit (WLL) listed in the rigger reference booklet for that size and type. For that combination, the WLL is 13,000 pounds. This rating reflects the maximum safe load when the pull is straight and the load is centered on the shackle with the pin fully seated. It’s not the breaking strength, which would be higher, but the practical limit used for safe rigging.

In practice, avoid side loads or angled pulls, and ensure the pin is secured and in good condition, because loading in ways the shackle isn’t designed for can greatly reduce its effective capacity. If you’re referencing the booklet, this value matches the SP anchor type for 7/8 inch.