How to thread a pipe: a detailed overview of the main methods

Do you like to perform work on the improvement of the house by your own hand, not involving various masters? Self-installation or repair not only allows you to save money on calling specialists, but also greatly increases self-esteem, because the right?

In the process of installation of communications often arises the need to prepare the threads on pipes. Have to find ways not to spoil the product.

We will tell you how to thread with different tools, which method is preferable to use in this or that situation. The article examines the methods available for an unqualified performer. The features of threading different types of threads and equipment used in this case are covered.

The presented material is supplied with illustrative photos of the tools to do the job. And the video with recommendations will help to understand all the nuances of this process in detail.

How to thread a pipe with your own hands: making a thread

Very often during the installation of pipelines or in the process of repairing it is necessary to change the old pipes with new ones. This must be done by threading new pipes with suitable threads.

An experienced craftsman is unlikely to have a problem with all this, because over the years he has “got his hand in the game” and can do everything with almost no effort. over, professionals have all the necessary tools for this.

What if it is necessary for the average person who does not know how to thread a pipe? The services of a plumber are often overpriced.

Threading is needed everywhere

So, to begin with, you need to remember that the pipe threads are always cut on the pipes. Besides, you don’t have to think much about the dimensions, because in all apartments the pipes are standard, and their sizes can be 1″, 1 1/4″, 3/4″ or 1/2″. Therefore, for threading with your own hands, you need to get a strip or pipe tongs.

How to thread a pipe with a die

First we will talk about a die. Sometimes you may hear this tool referred to as a “lerka,” although the latter term comes from the days of the Soviet Union. This is a fairly common tool that can be purchased at any store with metal cutting tools.

But before you go out and buy yourself a strip, it is worth knowing the size of the pipe on which the thread will be threaded. Basically it is half inch, three-quarter or inch. When the size is known, an ordinary die with a cylindrical pipe thread is purchased. There is a letter G in the marking on such tools, that is, the die for half an inch will have the marking G1/2″. With the use of such tools, the threading on the pipes will be done correctly.

Since you can not thread the thread holding a strip in your hand, you need to get hold of a strip holder. Its cost may be equal to or even greater than the cost of the torque limiter. If you work only once, you can buy a Chinese-made tenoning tool, which costs less than the domestic one. If you want to buy a quality tool, then it is better to pay more money, but become the owner of a domestic holder. The reason for the low reliability of a Chinese tap is the raw material silumin.

Threading dies

How to thread a pipe with a die. a rather complicated process. At least for those who have never done it before. The thing is that the die does not have a guide, so it is very difficult to cut the thread straight away, and it constantly “rolls up”, which should not be allowed. That is why if you do not have experience in threading, it is better to have a special tool called a tongs.

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Threading on a pipe with a pipe club

Now about how to thread a pipe with a crescent drill.

This tool is very convenient. And even a person who has never done anything like this in his life can do it correctly.

Everything is very easy, and the reason for the ease is the special guide that the tool has. A tube is inserted into this guide, after which all the person has to do is twist the clevis, and the thread will cut itself with almost no effort.

To facilitate the process, you can buy a special ratchet, which will not remove the tool, to twist the clipper, even if there will be little space for it.

If it is necessary to cut a thread on a pipe of large diameter, that is from one inch, it is better to get a special extension for a ratchet. This will make the lever larger and therefore less effort to thread. Among other things, when threading pipes by hand, you need to water the pipe with a special threading fluid or ordinary machine oil.

Such a step will make the process easier. And this method can be used when threading in any material and with any tool, whether it is a tap, die or clip. As you can see, threading with a crescent stone makes it a lot easier to thread, but in turn it leads to higher costs

Electric machines make it easier to do

There are also special electric clinchers where no additional effort is required to thread the pipe.

The principle of operation of such a tool is identical to that of a hand held tool but instead of human effort it uses an electric motor. So, threading is not difficult for a person to do at all, because all he has to do is mount the device on the pipe, pre-lubricate it with oil, and turn on the electric plunger.

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How to thread a pipe. classification of pipe threads, basic methods

In the process of building or repairing a house, the task of threading a pipe can suddenly arise. And you can quite easily cope with such a task yourself. Threading covers the inner or outer surface of not only pipes, but also a variety of fasteners. nuts, bolts and other. Master plumber will tell you how to thread with different tools, which method is preferable to use in this or that situation.

The term “tubular” has a privileged position in the plumbing industry. This term is classified with an eye to the group of standards that define the criteria for connections of various elements of sanitary constructions.

For example, the size of a pipe thread is designated by a numerical value indicating the standard of the passing diameter of the pipe. But not the physical diameter of the thread.

  • Cylindrical (G/BSPP);
  • Conical (R/BSPT);
  • Round one for shut-off sanitary fittings (Kr);
  • Inch cylindrical (American standard NPSM);
  • Inch taper (American standard NPT).

The locksmith, whose main work area is the household, is advised to take as a basis the conventional division of pipe threads into two main types:

It is with these two kinds that the home plumber who services domestic plumbing equipment, performing the installation of water or heating pipes is most likely to encounter.

  • Threading of pipe for metal plumbing assembly;
  • Threading to install shut-off valves;
  • Modernization and extension of the circuit;
  • Threading to install the adapter.

For domestic conditions, of course, the manual technology is more relevant. Threading on plumbing or other pipes by hand is often done with a die.

Note! One-piece dies for pipe threads made of solid alloy steel are available in body diameters up to 65 mm. For metric threads dies with body diameter of up to 120 mm are produced. Metric tools have “M” symbol on the body

The die is a simple device for threading pipes at home. The same tool is also successfully used on industrial machines.

The device looks like a disc with several axial holes drilled on its inner diameter. The edges of these holes form several cutters (usually 8 to 10). Material for dies is alloy steel or other hard alloys.

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According to the form of execution dies are produced in the form of circle, square, hexagon, prism. The most common are circular tools. They are used for threading water pipes up to a diameter of 36 mm.

One-piece dies give the best quality threading (metric, tapered) on pipes in manual operation or on machines.

However, this type of tool due to the rigidity of its own design has its own disadvantages. Cutters wear out quickly.

Please note! The spring-loaded threading tool is distinguished by the presence of a cut in the area of one of the axial holes. Cutting with a slit reduces the stresses on the picks, but it also reduces the degree of toughness needed to achieve high cutting quality

Spring-loaded (cut) dies have a less rigid construction which makes it possible to thread the pipes and thus change the thread diameter in the range of 0.1-0.3 mm.

Such fixtures are characterized by high wear resistance of cutters, but do not provide high accuracy and purity of threading.

Sliding dies consist of two working parts. They are designed for mounting in the clamping module. a clamping tool.

Clamping in the clevis is performed by a mechanism consisting of a slide and an adjusting screw. The screw is used to adjust the size of the threading diameter. A crescent is usually equipped with a set of dies for several different diameters.

The process of threading a pipe with a die or a clevis involves a locksmith performing some preliminary steps:

  • The surface of the pipe in the area of threading must be carefully cleaned;
  • Grind the end part of the pipe with a file (make the entrance chamfer);
  • Apply a lubricant on the work surface to reduce resistance.

If possible it is desirable to fix the pipe vertically, for example, in a bench vice, leaving free access to the upper part. the area of the cut. Carefully calculate the fastening force so as not to deform the body of the pipe.

Then take previously prepared screwdriver with roughing die of required diameter and suitable threading characteristics.

Threading internal pipe threads with a tap

To thread inside a pipe, you generally use a tap. It is shaped like a rod with cutting edges. It is necessary to insert it into a special screwdriver.

  • The fence part. Represents a cone that directly taps the thread. Teeth of the cutters are arranged around the full circumference.
  • Calibrating part. This element is a continuation of the fence part and has the form of a cylinder on which the teeth are located.
  • Tail piece. Has a square head and is designed to hold the tap in the hole.

To prevent the tool from overheating during work, different media are used for cooling:

If there is not enough coolant, the profile may be uneven or rough.

Specialists advise using complete taps in the work. Includes tool for roughing and for finishing work. By eliminating at least one of the taps, you will not save much time, but the quality of the end result may be poor.

Tapping tongs: varieties

To date, there are two types of clips, which are successfully used in the field of plumbing. a manual and electric clips. The difference between them lies not only in the presence or absence of an electric motor, but also in the principle of their use. Let’s consider in more detail these two types of tools for threading.

  • Electric Threading Clipper. It is a very good tool, but, as they say, not without flaws. Despite the fact that it greatly facilitates the work of the master, yet its use is limited. it is almost unable to work with already installed pipes, especially if they are laid along the walls. In some cases, of course, it can be stretched over the pipe, but in many cases (especially if we talk about replacing risers) it is not suitable. The only area of application where it has proven to be excellent is in the installation of new utilities, when threads are cut on uninstalled pipes. There are two basic varieties of electric clupps. a clupp and the first number is a manual tool. it can thread pipes with a diameter up to 40mm. The second one is designed for working with pipes up to two inches in size. There is a third type of such tools. it is practically a full-fledged stationary machine, which is able to cope with both thin pipes, and with thick tubes, whose diameter does not exceed 2 inches.
  • Manual threading tongs. its design is quite different from its electric counterpart. It is a round holder for a changeable tool, equipped with a ratchet. The task of the latter is to ensure the operation of the machine in two directions (forward and backward). To make it easier to work with this tool, it is equipped with a rather long lever, which can be built up if necessary. Like its manual electric counterpart, it is divided into two numbers: the clupp is capable of cutting threads from half an inch to an inch and a quarter, and the clupp number is designed to cut threads of one and a half and two inches. There are no universal hand held clups with interchangeable blades.
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This is how things are with such a useful tool as a threading tong. I want to note additionally that this tool can be made in one set, for example it can be designed only for cutting a half-inch thread or only for cutting a three-quarter thread. Such tool can be sold individually or in sets. But there is no sense to get a set of clips. it is better to get a universal clipper with a set of replaceable tools.

  • A crescent is a tool for threading in hard-to-reach places. It looks like a slotted wrench, but instead of a bolt head, it has a hole to hold the indexable cutters. The principle of the clipper is similar to the die, only instead of a whole washer, it uses its cutting edge, and for turning it uses a mechanism similar to a wrench. There are wrenches which use an adjustable wrench or an open-end wrench for turning instead of a solid body. Such a device will cost less than a one-piece clevis with a ratchet, but when using them, you can be injured, because the wrench sometimes slips off.

What tool is needed

Threading on pipes will require mandatory availability of the following devices:

  • Measuring tape, pencil, caliper. To assemble the pipeline, it is necessary to develop a scheme in advance. First take the pipe with a specified length: the marking is made with a tape measure and a pencil. A caliper is used to measure the diameter and select the proper tools. When marking it is important to observe considerable accuracy and precision, as any deviation from the specified size leads to a violation of the correctness of the entire construction. As a consequence, in such cases, it is often necessary to redo the entire pipeline.
  • angle grinder. Use these tools to cut the pipe according to the marks you made. These functions can also be performed by a simple hacksaw.
  • Vise. The pipe must be firmly clamped in a horizontal position at all times.
  • Machine oil or other grease. To facilitate manual threading, it is practiced to lubricate the tool and the area to be threaded with a special substance.
  • Tools for threading. Pipe threads can be threaded with a club, die or tap. What tool to use depends on the type of thread to be threaded and the preferences of the thread cutter. For different works, different kit for threading pipes, depending on the situation. The male threads are threaded with a die and held by a cotter or tool holder. To apply the internal threads you need taps.

There’s nothing difficult about threading a pipe yourself.

The main thing is to have a special tool at your disposal.

Perform all operations carefully and without haste. One more thing not to forget:

[note]Any housework can be done by your own hands, the main thing is to find the right approach. So you can save money from the family budget.[/note]

Master class from a home craftsman who took up threading on a pipe for the first time. watch the video.

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