How to Thread Pipe

When working on an older home, it may be necessary to thread pipe when updates or repairs are needed. Pipe threader machines have evolved over the years and portable units are now relatively inexpensive and can be used by homeowners who choose to do their own plumbing rather than hiring a professional. Here’s how to thread pipe.

Most new pipe threader models have an on-board cutter, reamer, oiler, foot switch, stand and 115V operation.


1. Purchase or rent a manual pipe threader machine from an equipment retailer.

  • A die head will be attached to cut the thread.
  • Machines now have the ability to thread pipes made of different material, including various types of plastic or resin.
  • A heavy duty pipe threader can also cut your pipe into workable sections.
  • The pipe threading machine will be used to thread the end section of your pipe.

2. Inspect the pipe threader before beginning and replace dies or any parts that show signs of wear.

  • Inspection for signs of wear will not be necessary if you purchase a new threader.
  • Worn or damaged dies can result in poor thread quality.

3. Mount your pipe firmly in the pipe vise by placing it in the vise and then tightening until it is held tightly.

4. Cut the end of the pipe cleanly and squarely by using a pipe cutter.

  • If you have an industrial pipe threader with cutting capability, use the machine to cut your pipe to length.
  • Pipe cutters come with and without guides, which provide square alignment. It’s better to use a guide, rather than estimating your cut.
  • The pipe cutter will have a thin cutter wheel, which will slice through the pipe as you guide it in the space.
  • Be sure to wear goggles and protective gear. Steel may produce sparks.

5. Ream the cut end of the pipe to remove any burrs from the cut using a reamer, which is a cylinder-shaped rotary cutting tool that you run smoothly across the freshly cut edges of the pipe to remove rough edges.

6. Select your die head according to the size and type of pipe you are threading and the thread form you require.

  • Die heads come in different shapes and sizes that include different threads for pipes that have different diameters.

7. Place the die head over the pipe on the threader.

8. Press steadily on the front of the die head, while simultaneously pushing the handle down to start the threader.

  • Before placing too much pressure on the handle, check to be sure the ratchet pawl is engaged.

9. Use your weight as leverage to apply pressure on the handle, while holding it firmly.

  • Be sure to maintain proper footing and balance for maximum control.
  • Never use a tool or mechanism to hold the handle in place in order to free your hands.
  • This can be dangerous and could result in injury.

10. Apply threading oil generously while threading.

  • Using an oil too thin as a substitute for threading oil can result in sub-standard threading.

11. Cease threading when the end of the threading die is flat against the end of the pipe.

  • When the die is even with the pipe, that means the correct threading size has been reached.
  • If you continue pushing after this point, you will damage the thread.

12. Reverse the ratchet mechanism and turn the die head in the opposite direction.

  • Be careful to maintain control of the threader as the dies are removed.
  • Threads can become damaged when the die head is being removed if you don’t maintain control and move the piece smoothly.

13. Stand the pipe on end and gently tap it to remove any particles that may be lodged within.

14. Clean the pipe with a cloth, removing any oil.

  • Be careful, the threads will be very sharp.

15. Seal the threading with Teflon tape or a pipe thread compound when attaching the pipe to the connector.

16. Clean the pipe threader machine thoroughly after use so the oils and metal pieces do not damage the machine, which could cause sub-standard threading during your next project.

(This article comes from wikiHow editor released)

What is Pipe Thread?

Pipe thread is a spiral ridge on the end of a pipe that enables pipes to be joined together. For male fittings, this thread appears on the outer diameter of the pipe; if female, it appears on the inner diameter. By rotating a male pipe end into a female thread, the two fittings become joined.

Since male and female threads must align successfully to form a connection, manufacturers follow industry standards. The two main standards are the National Pipe Thread (NPT), and the National Standard Free-Fitting Straight Mechanical Pipe Thread (NPSM). NPT is a tapered thread that can make a close-fitting wet seal. NPSM is straight and only forms a mechanical seal; it is not used for liquid applications. In the United States, garden hoses have their own standard (GHT), as do fire hose couplings, which use the National Standard Thread (NST).

When joining NPT tapered pipe thread to make a leak-proof seal, professionals recommend using a sealer such as polytetrafluoroethylene (PTFE) tape. PTFE, more commonly known as Teflon®, is also the name of the best known brand of sealing tape. Tape should be wound tight around the male threads, running in the same direction as the lead thread so that the turning motion of joining the pipes follows the tape’s winding direction. Sealing tape makes it easy to drive the male pipe deeper by allowing the threads to slip past one another, while filling minute gaps to prevent seepage. Pipe thread tape also makes it easier to disassemble the joint later, if need be, by reducing thread galling, or the tendency of some types of threads to stick together over time.

Modern pipe sizes are stipulated by a measurement of the outer diameter (OD), which is measured over the pipe thread in the case of a male pipe. To be sure that the threads will match, you can also count the threads per inch (TPI). The inner diameter (ID) is sometimes used when buying polyvinyl chloride, or PVC, pipes.

Building codes require that piping meet certain standards depending on the application. Pressurized gas or liquid, natural gas, potable water and underground drainage pipes will be made of different materials. Note that local laws might require that only licensed contractors work on gas lines. Before undertaking any home piping project, check local building codes and take proper safety precautions.

(This article comes from wiseGEEK editor released)

Esteemed for High Technology

Precision tubes are finished up by bright annealing or special cold drawing. Precision tubes corresponds to the usage in which a high surface quality and excellent dimensional accuracy are demanded for nuclear power, for the semiconductor, for the medical treatment and for food etc..

Kobe Special Tube has realized a high-quality, small diameter tube with excellent dimensional accuracy and surface quality. It is used for such applications as stainless steel fuel cladding tubes for fast breeder reactors, medical equipment, and electric parts. Since 1987, the product has been manufactured in a new airconditioned and clean factory.

Example of application

    • For nuclear power
    • For the semiconductor
    • For the medical trearment
    • For food

(This article comes from KOBELCO STEEL TUBE editor released)


Carbon steel structural beams are manufactured in two configurations. Both are constructed with a vertical web in the center of the beam, with horizontal flanges on top and bottom. The structure of the beam provides superior load-bearing support.

  • Standard American Beams – Also known as Junior Beams, S Beam, or I Beams have tapered flanges for increased strength of the flanges.
  • Wide Flange Steel Beams –  Also known as W Beams or H Beams have non-tapered flanges that are wider than the standard S or I beams.

I- and H- beams are widely used in the construction industry to provide support for buildings and load-bearing walls. They are available in a variety of standard sizes and selected based on the applied load for the required application. I-beams may be used both as beams and as columns.


  • Construction support beams for commercial and residential construction
  • Support frames and columns for trolley ways, lifts and hoists
  • Mezzanines and platforms
  • Trailer and truck bed framing


  • Construction support beams for commercial and residential construction
  • Mezzanines and platforms
  • Bridges
  • Trailer and truck bed framing
  • Machine bases

(This article comes from O’NEAL STEEL editor released)