THREADING Pipe Dies Selection: Models OO-R, 11-R, 12-R, O-R, Ratchet Threaders or 30A, 31A 3-Way Pipe Threaders Catalog No. Nominal Pipe Size – Threads Per Inch Die Material or Type 1 ⁄8 -27 (NPT) National Pipe Taper Alloy RH 37810 High-Speed RH 37855 High-Speed LH – H.S. For Stainless Steel RH 37900 H.S.
