This SAE Standard applies to all mobile, construction-type, lifting cranes as equipped for operation with hook, clamshell, magnet, and grapple attachments. It is not applicable to excavating and demolition attachments such as shovels, hoes, draglines, and wrecking balls. the purpose of this document is to set forth wire-rope strength factors that have been proved by design and operating practice to be consistent with safety, economy, space, weight, and other requirements peculiar to mobile, construction-type, lifting cranes.