Safe working load | Proof load |
---|---|
Up to 20 short tons (18.1metric tons) | 25 percent in excess. |
From 20 through 50 short tons (18.1 to 45.4 metric tons | 5 short tons in excess. |
Over 50 short tons (45.4 metric tons) | 10 percent in excess. |
Code of Federal Regulations
251
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