How to cut threads on a pipe

How to cut threads on a pipe

I will show you how easy it is to cut a thread on a water pipe for an ordinary home craftsman, without any skills in this matter and with a minimal set of tools. For example, when replacing a central heating battery, as in my case. There is absolutely nothing complicated about this and the method is accessible to almost everyone.
So, you cut the pipe with a grinder or other tool, such as a hacksaw. The main thing is that the cut is even and perpendicular.
How to cut threads on a pipe

Will need


  • Clamp for the required pipe diameter.
  • Adjustable wrench (gas).

A die is a thread-cutting tool, like a die, but it is an attachment with a guide skirt. It must be purchased from a plumbing store. There is no shortage of them, so you can find them without problems, even in the village.
How to cut threads on a pipe

In this case, the Chinese version is presented, which is quite good.
How to cut threads on a pipe

Such a thing costs around 200-500 rubles. It all depends on the diameter and markup. Running models with diameters of 1/2, 3/4 inches and inch, as in my version.
How to cut threads on a pipe

You can ask plumbers for a Soviet equivalent, if possible. Then it will be completely free for you.
How to cut threads on a pipe

Cutting a thread on a pipe


You don't have to remove the old paint. We lubricate the place where the thread will be with solid or liquid lubricant: grease, lithol, engine oil.
How to cut threads on a pipe

We also coat the cutters on the die.
How to cut threads on a pipe

In neither case do you need to apply a lot of solid lubricant, since after cutting the chips will stick to it and will not fall down, and therefore be removed.
We put the guide clamp on the pipe.
How to cut threads on a pipe

In theory, the clamp is rotated with a specialized tool - a ratchet, but since we have a one-time job, it will not be profitable to purchase an expensive tool.
We take an adjustable wrench and adjust its size to the rear skirt of the clamp.
Rotate the tool, making several turns around the pipe. The cutters are now engaged.
How to cut threads on a pipe

If the pipe is flimsy and unstable, it needs to be held with another adjustable wrench like this:
How to cut threads on a pipe

And use another adjustable wrench to rotate the nozzle.
The cutting sequence is as follows: 2-3 turns of the die forward, 1 turn back. This must be done so that the chips break, fall off and do not interfere with further cutting. If this is neglected, chips can jam the threads.
How to cut threads on a pipe

In total, you need to cut 4-5 full turns of thread.
How to cut threads on a pipe

As a result, the thread on the pipe is cut.
How to cut threads on a pipe

Also keep in mind that the cutters in the die have a small cone. This is necessary so that you can start and cut threads with ease. As a result, I lead to the fact that the final turns may not be complete and not cut in depth.
Therefore, in order to get 3-4 full turns of thread on a pipe, it is visually better to cut 6-7 turns.
After all the work, the thread can be checked by screwing any adapter or fitting onto it.
How to cut threads on a pipe

The thicker the pipe, the greater the force required to rotate the nozzle. The method is not tricky, almost no proper skills are required, even a beginner can do it. It is impossible to skew the thread, so there is no need to be afraid.

Watch the video


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Comments (20)
  1. Lamerische
    #1 Lamerische Guests 28 June 2018 22:02
    3
    How is that possible??? When you try to turn the screw, it will immediately jump off the pipe! You either need to press very hard on the side of the tool to “cut” the first turn, or you need to grind the pipe to the diameter of the entry. If you need to hold the wobbling pipe with a second wrench, you need a second participant.
    1. Manuel
      #2 Manuel Guests 29 June 2018 19:32
      2
      If you remove the chamfer, it goes well.
  2. Guest Gennady
    #3 Guest Gennady Guests 28 June 2018 22:08
    1
    About solid lubricant in more detail.... maybe it’s still thick?? stuck_out_tongue_winking_eye
    1. EVGENY IVANOVICH
      #4 EVGENY IVANOVICH Guests June 29, 2018 08:11
      10
      Based on many years of experience, we have always used a piece of lard as the best lubricant for thread cutting at home. As the temperature increased during slicing, the lard melted and the chips fell off.
      1. Guest
        #5 Guest Guests 18 July 2018 13:49
        2
        grease, grease, mung bean/butter. And you need to snack on lard!
  3. I
    #6 I Guests 29 June 2018 14:28
    5
    Klupp is a rare YYYY...... there is no better way than a proven Soviet cleaver, we cut the thread with godfather with a set of these cleats and got screwed...... took the cleaver for 5 minutes and you're done
    1. Guest Sergey
      #7 Guest Sergey Guests 30 June 2018 20:51
      3
      You just got a piece of shit.
  4. anvar aminov
    #8 anvar aminov Guests 29 June 2018 18:18
    0
    it’s not so simple as the author writes here....there’s experience and a tool, respectively......then you’ll say, well, it’s easier to contact such and such a mother at the housing office
  5. Alexey Rodenko
    #9 Alexey Rodenko Guests 29 June 2018 22:32
    11
    And before, such “wisdom” was taught at school. In the sense of cutting threads, working on simple machines, etc. And now you see a “life hack”.
    1. Guest Igor
      #10 Guest Igor Guests 10 September 2018 19:47
      2
      We were definitely not taught how to work as Klupps at school. They taught with taps and dies. It was so.
      But it’s really easier and cheaper to turn to locksmiths from the management company. Buy Klupp just for one cut? For what?.
      Or buy a set of dies, too, why? If I don't use them again in my life.
  6. Guest Alexander
    #11 Guest Alexander Guests 29 June 2018 22:58
    1
    It’s better to spray it periodically with plain water; the chips don’t stick to the thread or the plug, and the plug can be easily removed from the pipe later. We make heating entirely from metal, mainly cutting 1 1/4
    1. Eduard Kirsanov
      #12 Eduard Kirsanov Guests 18 July 2018 14:06
      0
      And I lubricated it with drying oil until I got oil with a very high wedge. Vegetable. I don't know the name. The smell is reminiscent of castor oil. He has no equal at all. But even with drying oil (natural, of course), the carving turns out to be of very high quality.
  7. Y
    #13 Y Guests July 3, 2018 03:15
    2
    dies for 300-400 and they won’t cut one thread, they will fall apart, the Chinese make them from...
  8. Konstantin Esaulov
    #14 Konstantin Esaulov Guests 3 July 2018 22:05
    11
    People, don’t fall for this shit... I’m telling you as a plumber. Everyone must do their job. In general, I never cut threads larger than 3/4, especially on a pipe like the one in the photo; I had a sad experience about 10 years ago. Break off the pipe in the ceiling or wall. Welding threads is much easier.And one more nuance, the klupt is twisted with a special ratchet, and the collective farm is not made from anything, then there is no need for a third hand. Another question is that for the clamp you need space both along the length of a flat section of the pipe (even with the shank cut off in half, this is about 7-8 cm), and along the distance of the pipe from the wall (about 5 cm). Having once broken off a pipe in the ceiling and learned all the delights of replacing it through the ceiling with chiselling and swearing for half a day, you will understand that this should be done by specially trained people.
    1. Visk
      #15 Visk Guests July 4, 2018 07:48
      5
      Don't make people laugh, plumber. You don’t even know how to spell KLUPP, so here’s your advice! You'd have to be a complete fool to rip off a thread. I cut it this way 30 times! Some of the cuts have been in service for more than 8 years. If you don't understand, don't be smart.
  9. None of your business
    #16 None of your business Guests 18 July 2018 22:35
    0
    Why such complexity when they sell connectors without threads?
  10. Evgeniy
    #17 Evgeniy Guests July 23, 2018 06:50
    0
    This works with a solid-rolled pipe, but not with a welded one. I remember trying to cut it three times and it burst at the seam. In the end I went to the plumbers to have it welded. :)