In the designation of chain slings, what does the "O" stand for?

The designation of chain slings commonly includes a letter "O," which specifically signifies the presence of oblong master links at each end of the sling. Oblong master links are designed to create a more efficient load distribution and enhance the overall performance of the chain sling. This feature is particularly important because it allows for easier attachment and movement of loads, providing a stable connection point when used with other rigging components. By having oblong master links, the chain sling can accommodate various rigging setups, making it versatile and effective for lifting operations.

Understanding the significance of component designations like this is crucial for safety and effectiveness in rigging applications.