5/16 inch rod Size 24 Threads per inch High-Speed Bolt Dies Right Hand Thread Used in 531, 541 and 500B 1/4 UNF (Fine Thread) Designed for use in 531 Die Head Cuts accurate and percise threads Designed for use in 541 Die Heads Designed for use in 500B 1/4 to 1 inch Die Heads Dies can be changed without removing the die head from the machine Marked for easy identification of the type of pipe and the sizes they are designed to cut for easy identification Notches in the dies click into position against spring balls in the die head for easy confirmation the dies are installed correctly
