Replacement Pipe Die Compatible Pipe Size 2 1/2 in to 4 in Compatible Material Type Aluminum Galvanized Steel Steel Thread Type NPT Compatible Thread Direction Right Hand Die Material High Speed Steel Die Head Compatibility Ridgid 141 Geared Compatible Threader Series 141 Receding Geared Application Pipe Number of Dies 5 Threads Per Inch 8 Compatible Threader Type Threading Machine Compatible Die Head Grainger Part Number 6YJ38 Compatible Die Head Manufacturer Part Number 141