A pipe threading machine holds and turns a pipe in a chuck while a die head with chasers cuts a tapered thread on its end. Most also cut the pipe to length and ream the inside. They are used for water, gas, fire-fighting and steam pipelines, mostly in BSP or NPT taper threads.
Quick facts
- Pipe range
- Common models: ½"–2" or ½"–4"
- Threads
- BSPT, NPT and others with matching chasers
- Operations
- Cut, ream, thread
- Drive
- Electric motor with gearbox
- Coolant
- Thread-cutting oil
- Portable
- Many are on stands for site work
Main parts
- Front and rear chucks that grip and turn the pipe
- Die head with chasers for each thread size
- Pipe cutter and reamer
- Carriage that slides along the bed
- Oil pump and tray
Good to know
- BSP and NPT threads look alike but do not match: use the right chasers
- Worn chasers give torn, leaking threads
- Stainless pipes need slower speeds and good oil
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Questions
- What is the difference between BSP and NPT?
- BSP (British) uses a 55° thread angle and NPT (American) 60°, with different pitches. They do not seal with each other.
- Can a pipe threading machine thread rods?
- Yes, with bolt dies for straight threads on rods and bolts.
- What size machine do I need?
- Choose by the largest pipe you thread; ½"–2" covers most building plumbing, 4" machines suit larger lines.
The figures on this page are typical values for guidance, written by Diemeco from standard engineering practice. They are not a specification: confirm grades and properties with the relevant standard or the supplier's mill test certificate, and tolerances with your workshop. Last checked 23 October 2026.