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. Purpose??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.