Adapter for Threaded Tips-1/2-20 UNF ......click on photo to enlarge for dimensions and available sizes. These adapters are required when using threaded tips U.53E4>U.53E14 with slide hammers U.49AM and U.306M. They are also included with beam puller kits U.53J1 and U.53J2. Threads may become damaged over time and the adapters should be replaced. Thread damage due to loading under use is considered "wear" and not covered under warranty.