What is the working load limit (WLL) of 1/4" Grade 30 proof coil chain?

The working load limit (WLL) of a 1/4" Grade 30 proof coil chain is indeed 1300 lbs. This specification is determined based on the material properties and design criteria for Grade 30 proof coil chain, which is commonly used in various lifting and rigging applications.

Grade 30 proof coil chain is typically made from low carbon steel and is designed for general-purpose use in lifting, pulling, or securing loads. The 1300 lbs WLL indicates that under standard conditions of use, the chain is rated to safely handle loads up to that weight without failing.

Understanding the WLL is crucial for ensuring safety and preventing accidents during rigging, as exceeding this limit can lead to chain failure and result in injuries or damage to property. Each specific type of chain has its own WLL based on diameter, grade, and material. Therefore, knowing the specifications is vital for rigging professionals.

The other choices do not represent the accurate WLL for this size and grade of chain, and it's important to rely on established standards for safe practices in rigging and lifting operations.