Grand Brass Lamp Parts, LLCStaff Answer
Oct 15, 2026 - 06:09 AM
Thank you for your question! The marking on the die is actually NPS (National Pipe Straight), not NPT (National Pipe Taper).
NPS threads are straight (parallel) threads, while NPT threads are tapered. Lamp pipe threading commonly uses straight IPS threads rather than tapered pipe threads.
This die (SKU: TO18DIE) is designed to cut 1/8 IPS straight threads (27 threads per inch), as indicated by the "1/8," "27," and "NPS" markings on the die.
Therefore, this is the correct type of die for cutting 1/8 IPS lamp pipe threads.
