What is the minimum design safety factor for general sling use?

What is the minimum design safety factor for general sling use?

• A. 3 to 1
• B. 4 to 1
• C. 5 to 1
• D. 6 to 1

Answer: (C)

Five to one. This means the sling is designed so its breaking strength is at least five times the maximum load it is expected to carry in service. The extra margin accounts for real-world factors like dynamic shock during lifts, angle loading, wear and abrasion, temperature effects, and occasional measurement or setup errors. With this minimum, the working load limit (the safe lifting capacity) is derived by dividing the breaking strength by five, giving a consistent safety standard for general use. Lower factors reduce the protection against unexpected loads, while higher factors are more conservative but not the standard minimum for general sling use.

Five to one. This means the sling is designed so its breaking strength is at least five times the maximum load it is expected to carry in service. The extra margin accounts for real-world factors like dynamic shock during lifts, angle loading, wear and abrasion, temperature effects, and occasional measurement or setup errors. With this minimum, the working load limit (the safe lifting capacity) is derived by dividing the breaking strength by five, giving a consistent safety standard for general use. Lower factors reduce the protection against unexpected loads, while higher factors are more conservative but not the standard minimum for general sling use.