How can external thread be cut

How can external thread be cut?

The external thread is cut by hand using special tools. dies. They are subdivided into round (lerki), which are made in one piece or split, and sliding. One-piece dies can only cut external threads of one diameter.

How to thread a pipe next to a wall?

In order to cut a thread on a structure near the wall, you need to use a die. The chamfer on the cut will help to make the first turn easier. Before work, it is recommended to coat the die and the pipe near the wall with grease. Then the die is put on the structure.

How to properly cut a thread with a die?

  • Secure the pipe or workpiece in a strictly vertical position.
  • Lubricate the tool with oil.
  • Place the die on the head of the rod in a perfectly horizontal position and start with the first few circles.
  • If there is an obvious bias on the first circles, remove the die, tap the workpiece and start over.

How to thread with a Ratchet?

  • we install the klupp of the required diameter from the purchased set into the ratchet;
  • apply oil to the cutting edges;
  • we put the guide on the edge of the pipe;
  • we begin to twist the ratchet, cutting the thread;
  • we lubricate the pipe and cutting edges during operation.

What is the thread on the 25 pipe?

Designation DN-25 or DN25 corresponds to the nominal bore pipe diameter of 1 inch.

How can you thread a pipe?

Tapping plumbing or other pipes by hand is often done with a die. Die is a simple pipe threading device at home. The same tool is successfully used on industrial machines.

How to cut an internal thread on a pipe?

Hand tools. tap

Pipe tapping is used to create threads within products. This range of equipment consists of screw-shaped tools. Chip grooves are cut on the pipe with a tap. This tool is equipped with a shank, which is attached to the machine or wrench.

Preparing for manual operation

It is believed that the history of the first screw connections began long before the birth of Christ. The pioneer is the ancient philosopher, mathematician and mechanic Archytas of Tarentum, who lived in the 3rd century BC. His follower was the world-famous Archimedes, who took advantage of this teaching and applied science in practice to move liquids and bulk substances. However, theoretical teachings were not included in textbooks or were forgotten (it is not known for sure), and the technological peak fell on the 19th century AD. The English scientist or inventor Henry Maudsley first presented to the scientific community an apparatus in the form of a screw-cutting lathe, with the help of which point cutting was performed. As a result, the date of creation of the equipment is equated to the industrial revolution, since until that time nothing of the kind had been invented, and it is from this moment that a breakthrough occurs in all sectors of the national economy around the world. Scientists dealing with the problems of metallurgy, mechanical engineering, materials science, machine tool building and other applied sciences, which are important for life, have put their hands on this process.

Now let’s look at the preparatory work for cutting pipe threads by hand.

How to cut an external thread in 2 steps

First, let’s figure out what this means and what are its parameters. These are cut grooves with uniform pitch between turns and with the same geometric profile on tapered or cylindrical material. Used to connect various parts, assemblies everywhere from building a house and water supply to mechanical engineering and shipbuilding.

We provide you with a schematic drawing to refresh your knowledge.

a. denotes an external thread. often, citizens have to cut this type on their own to connect plumbing devices.

In the picture, in both versions, the diameter is indicated by the English letters d, d1 and, accordingly, D, D1.

You are mistaken, believing that the threaded operation cannot be performed at home without the use of special equipment. Everything can be made independently without excessive financial investments using improvised tools.

To do this, before starting work, you should pay attention to the following points:

Contamination of the workpiece. If there are foreign inclusions, earth, rust, scale, oily deposits, traces of oil products, etc. on the surface, then it is absolutely clear that these problems must be eliminated by cleaning. Otherwise, foreign inclusions are likely to worsen the quality of the turns made.

From manufacturers, we often receive a part with a chamfer at the end, that is, with a fold. This defect must be eliminated with an angle grinder, and best of all with a file. This will give you a high quality sample.

If you want to get the product of the proper level, you will have to apply lubricant.

We recommend that you heed our advice, otherwise the working part can wear out strongly, and the event itself will drag on for an indefinite time and it is likely that failure to comply with the conditions can lead to deformation of the part and ultimately to its breakage.

How to manually tap a pipe thread. a step-by-step guide

A mechanical tool is essentially a nut made from hardened high quality steel. At the end there are holes in the form of flower petals, which are necessary for the removal of waste shavings. The inner part is represented by sharp cutting edges. Two holes are drilled on the body, into which the handle is inserted to ensure an even impact.

It is the most common model due to its lightness and ease of use:

We fix the vertically located pipe using clamps (vise).

Apply oil to the plane for better plate movement.

We insert the element strictly perpendicular to the workpiece in order to avoid skewing, which, even at a small degree, can lead to incorrect creation of turns.

We twist the handle clockwise, make two turns and come back. Thus, we free the waste shavings.

How and what to cut a thread on a metal pipe

In this article, we talk about the possibility of connecting metal structures with polypropylene products for the construction of various types of communications during the construction of a house. If earlier the installation was carried out using a welding machine, which is obviously difficult and expensive, nowadays it is possible to attach a variety of materials using fittings. In our article, together with you, we will understand the process of cutting (applying) external threads to pipes made from various materials. This will be especially interesting for citizens who are going to carry out the joining work of metal with plastic, since only a few decades ago it was considered a fantastic idea.

Cutting pipe threads with a die

The external device of the klupp looks more complicated, but the internal one is so constructive that it allows you to quickly and efficiently do the job.

Round metal frame, cast from durable alloy.

Four removable cutters or blade combs. The second sample has a colossal advantage. The first cutters make shallow grooves when moving, and the next, higher ones, sliding along the “rough” track, cut out a full-fledged, ready-to-use.

Wide holder with a guide tube that minimizes the skewing process.

Klupp is installed in the ratchet, and on the edge of the workpiece. a guide.

Cutters are lubricated for smooth running /

The ratchet starts working, which rotates around its axis.

READ  Why the Screwdriver Stop Working Upright

How to cut threads by hand

Threaded connections are widely used in the device of various mechanisms and machines. Bolts, studs, screws, nuts are versatile, interchangeable fasteners. However, there are times when you need to cut threads by hand. A specialized tool will help to perform this work qualitatively.

In mechanical engineering, there are three main systems of fastening threads: metric, inch and pipe.

Metric thread is the most widespread. It has a 60 triangular profile. Its main parameters, diameter and pitch, are expressed in millimeters. Example of designation: M16. This means that the thread is metric, has a diameter of 16 mm with a coarse pitch of 2.0 mm. If the step is small, then its value is indicated, for example, M161.5.

Inch and pipe thread diameters are expressed in inches. The pitch is characterized by the number of threads per inch. The specified parameters are standardized, so there is always an opportunity to choose the necessary tool.

External threading with a die

To cut an external thread, the following tools and materials are required: die or pipe die, die holder, file, vice, vernier caliper, machine oil.

The most widespread are round dies (lerki). They can be solid or cut. The diameters of solid round dies are standardized. This allows you to choose a suitable option from a wide range of sizes, for example, M10, M12, M14, M16.

A feature of split dies is the ability to adjust the diameter of the cut thread in the range of 0.1 0.25 mm. However, they have a reduced rigidity, which affects the accuracy of the resulting profile.

The die is placed in a die holder of a suitable size. After that, it is fixed with screws. In the case of external pipe threads, ratchet holders are often used. They provide convenience for working in hard-to-reach places, for example, against a wall.

The thickness of the rod is chosen 0.1 0.25 mm less than the diameter of the external thread. For example, for M6 with a large pitch it is 5.80 5.90 mm; M8. 7.80 7.90 mm; M10. 9.75 9.85 mm. Measurements are performed using a caliper. The diameters of rods for cutting metric threads of average accuracy class 6g are presented in the table.

external, thread

To ensure a better plunge into the die, a chamfer is cut at the end of the rod. Its width should be 1. 1.5 mm for M6 M18. The workpiece is lubricated with machine oil, which facilitates subsequent work and allows you to get a better surface.

The die is placed on the end of the rod so that its plane is perpendicular to the axis of the bolt being cut. Then, with a slight pressure, rotate the die holder clockwise (if the thread is left, then counterclockwise). When the die hits the rod one or two threads, it should be turned half a turn back for better chip removal. After that, 1-2 turns are made again along the thread and 0.5 turns in the opposite direction. Acting according to this scheme, the bolt is cut to the required length.

The diameter of the outer thread is checked with a conventional nut or ring gauge. If necessary, the step is controlled by a thread gauge.

Tapping internal threads

To form an internal thread, the following tools and materials are required:

  • hammer, center punch, drill, drill;
  • a set of taps, a knob, a bench vise;
  • machine oil.

Tapping technology

The first step is to mark the workpiece and center the center of the future hole. A drill is selected that corresponds to the required thread diameter. This can be done using look-up tables or approximately by the formula d = D. P. Here D is the thread diameter, P is its pitch, d is the drill diameter. For example, for М10 d = 10. 1.5 = 8.5 mm.

A hole is drilled in the part to the required depth, which must exceed the length of the cut part. Using a drill with a diameter greater than d, a chamfer is made at the edge of the hole. It serves for centering and better entry of the tap.

According to the main parameters of the thread. diameter and pitch. the cutting tool is selected. Typically, a set of two taps is used. One of them is rough, the other is final. By the size of the square of the tail part of the taps, choose a knob.

The part is securely fixed in a vice. The rough tap and hole are lubricated with machine oil. After that, the tap is installed strictly perpendicular to the surface of the part and, pressing along its axis, rotate the knob by the handles.

Having cut one or two threads of thread, make a quarter of a turn in the opposite direction. This facilitates crushing and removal of chips, and prevents jamming of the tool. The work is continued, carrying out alternating rotation: ½ turn forward, ¼. back. In this case, it is necessary to ensure that there is no misalignment of the tap. You should also not put excessive effort on it. To prevent jamming, the cutting tool is periodically removed, and the hole is cleaned of chips.

After cutting the internal thread to the required depth, a finishing tap is installed in the hole. When he goes in a given direction, a knob is put on him and work continues. Add lubricant periodically.

The threads are checked using a plug gauge or bolt. It should screw in effortlessly and not wiggle. If necessary, make an additional cut with a finishing tap.

Hand tools

Hand tools are the main type for threading in everyday life, their use has the following features:

  • Availability. Manual devices have the lowest price among devices of this type, therefore, they are available to any owner.
  • Functionality. When making a cut, the main device (die holder, wrench) is used, into which a cutting tool with the required parameters is inserted.
  • Compactness. Hand tools take up little space and do not require a lot of space for operations.

The industry produces ready-made sets of taps and dies of various sizes for cutting a threaded profile. this greatly simplifies the task of finding the necessary devices.

Basic threading techniques

Threads are produced by three main methods: cutting with a razor tool, cutting with an abrasive tool, and plastic deformation (rolling). Depending on the accepted threading method, there are several ways of threading.

but. threaded cutter; b. single-thread disc cutter; c. single-thread end mill;

Method of multi-start cutting with single-thread tools. thread cutters (rod rice.but,prismatic, round) and single-thread grinding wheels.

2.The method of single-pass cutting with multi-thread tools: combs, round dies, taps, thread-cutting heads, multi-thread grinding wheels (cylindrical and conical).

3.The method of single-pass cutting with rotating tools: threaded single-thread cutters (disc Fig. B, finger, end Fig. D), vortex heads.

A method of milling with multi-thread cutters, the length of which is greater than the length of the thread to be cut, thread rolling with wide rollers or flat dies.

Using an electric threading power tool

Using an electric pipe thread cutter, you can significantly speed up the work and improve their quality, standard die heads are available in sizes 1/2, 3/4, 1 and 1.1 / 4 inches. In addition to the heads, the set includes a power tool and a clamp, cutting is performed in the following sequence:

  • The clamp is fixed on the surface of the workpiece with a screw, the head from the electric clamp together with the power tool is put on the workpiece and its handle is fixed in the side tube of the clamp.
  • Press the electrical device to the end, turn on the reverse (counterclockwise) rotation of the head until securely seized with the pipe edge, then switch the direction of movement of the device to direct to apply the profile. When performing threading operations, the cutters are coated with a special oil that facilitates cutting and prevents chips from getting under the knives.
  • After the direct passage through the entire length, reverse and forward travel are alternately turned on in order to free the channel from chip inclusions. The reverse is switched several times, after which the head of the thread cutter is removed from the workpiece.

In this case, it is necessary to ensure that the chips do not fall under the knives. for this they are removed with a brush and the knives are periodically lubricated with a special oil that prevents it from sticking.

Tap collars

The collars are used to work as a tap. The shank of this device is inserted and clamped into it. Such hand tools are available as non-adjustable, with a fixed size of the seat, and adjustable, with a variable size of the seat.

READ  How to Thread a Fishing Line into a Trimmer Spool

A flat, non-adjustable wrench usually has from one to three holes of various sizes for the most common sizes of squares on tap shanks.

Today, such wrenches are practically not available. Non-adjustable ball-head wrenches are produced abroad.

Four square holes of different sizes from the above size range are made in the head at right angles.

Adjustable wrenches contain in their design a screw mechanism that moves the clamping parts that fix the shank of the device. Extension cords may be required when working in tight spaces. They are usually non-adjustable and are designed for only one size of the connecting square.

external, thread

Socket wrenches are used for work in hard-to-reach places. They are supplied with a fixing chuck with jaws, on which squares are made on the tap shank. They are available with either a fixed chuck or a ratchet. The ratchet must have a three-position direction switch (medium mode will lock the chuck).

When working with such a tool, simple rules must be followed, namely:

  • Use a lubricating fluid that minimizes force, increases performance and tool life;
  • When passing with the first tap, it is mandatory, and when passing with subsequent ones. when creating resistance to rotation, for every quarter or third of a turn, give a reverse stroke to remove chips.

Threaded cutters

This type of tool is one of the most common thread-forming tools that are used for cutting external and internal threads of various profiles on screw-cutting lathes, automatic machines and semi-automatic machines. The most simple in design, widely used in industry, are rod cutters.

How to cut an external thread using a die #1942

At the top of the threaded cutters, the clearance angle α = 8 150; the angle at the tip ε = 600. for metric threads and ε = 550. for inch and pipe threads. For carbide cutters, the angle at the top is not performed by 10-30 ‘less than the angle of the thread profile due to the fact that during high-speed cutting there is some “collapse” of the thread.

Lateral rear angles αdepend on the value of the angle and are determined in a static position by the formula:

In the process of work, the rear angles αb change due to the relative movement of the cutting edges along the angle of rise of the thread. When cutting the right thread, the side back angle αb on the left blade decreases, on the right. it increases by the value of the angle μ (Fig. 3,but) (for left-hand thread. vice versa):

Here, the angle μ is the angle of rise of the thread on the inner diameter of the thread (Fig. 3, c).

The value of the angle μ is determined from the ratio (Fig. 3, b):

Typically, when threading with small pitches on medium-sized diameters, the clearance angles on the side edges are not corrected. For large R(multi-start threads), small diameterd,when cutting trapezoidal and rectangular threads (the angle of rise μ reaches significant values), it is necessary to take into account the change in lateral angles αb and take this circumstance into account when sharpening.

Cutters for acute-angled threads due to overgrowth μ angles are made the same on both side cutting edges.

The rake angle at the threaded cutters for preliminary cutting is selected depending on the material to be machined and is set within the range γ = 5 250.

Uchistovye cutters, in order to avoid distortion of the thread profile, rake angle γ = 0. The profile of threaded cutters with a rake angle unequal to zero, differs from the profile of the thread being cut and must be specified in the section normal to the direction of the flank surface. In this case, calculate the cutter profile height and profile angle in the B-B section.

The initial data for the calculation are:

H– theoretical height of the thread profile in the diametrical section A-A of the thread to the sharp top,

Hp=BC=ABsin[90-(αγ)] =ABcos(αγ);(one)

AB = BD-AD (Δ-kiODB andODA); (2)

AD = ronecos (Δ-toODA); (3)

OB = r; OD = ronesinγ;(Δ-toODA) (five)

From the triangle abc(section of square B-B in Fig. 3.4) we have:

In formulas (8) and (9): Hp– theoretical thread height in section B-B (up to the sharp top); rand rone– the radii forming the outer and inner thread diameters; p– thread pitch.

If λ = 00, then the dimensions Hp and εpin section В-В are determined by the formula:

Similarly to (9) for the profile angle in section А-А we have:

Comparing (9) and (11) and substituting in (9) instead of Hp its meaningHcosγ,we get:

In domestic and foreign industries, assembled threaded cutters with mechanical fastening of replaceable carbide inserts are widely used.

The rhombic carbide insert is installed in the blind seat of the holder, clamped onto the two lateral reference surfaces and pressed against the carbide support.

Cutters of this design are designed for cutting metric threads with a pitchp= 1.5 6.0 mm and have overall dimensionsb×h= (16×20) (25×40) mmi lone= 125 200mm.

The Swedish company SandvikCoromant produces two types of threaded cutters with replaceable non-regrowth plates (RNP): with a mechanical screw fastening (Fig. 6, a) and with a grip (Fig. 6, b).

The cutting plates of the cutters of this company have three-working tops; each of them has a thread tooth with an angle of 600 (Fig. 6b, view A), with and without chip-breaking grooves. The plates are fastened either with a screw or with a clamp.

interesting is the design of the German company KruppWidia thread cutters with tangential arrangement of carbide plates for cutting metric, pipe, trapezoidal and other threads with a pitch of up to 8 mm.

In such cutters, in contrast to tools with radial inserts, the principle of self-wedging is used, when the insert is rigidly pressed by the cutting forces to the base surfaces of the body.

In this case, the insert is attached to the holder by means of a screw, and satisfactory chip breaking is ensured by chip breaking steps on the insert.

And due to the effect of self-wedging, the cutting plate is also attached to the incisors of the Israeli company Jskar. In this design of the cutter, an additional fastening with an elastic grip screw is provided, which increases the clamping force.

What tool is used to cut the external thread?

Types of threads on pipes

Although the procedure for tapping a water pipe is not difficult, it will not be superfluous to heed some advice. The ability to distinguish left from right thread, and inch from metric also does not hurt.

With a left-hand thread, the nut is screwed onto the bolt counterclockwise. If the thread is right-handed, the nut is screwed onto the bolt clockwise.

Metric threads are characterized by:

  • the geometric dimensions of the parts are measured in millimeters;
  • profile view. equilateral triangle;
  • has a smaller step.

The features of the inch thread are:

  • the unit of measurement for the geometric dimensions of the parts is inches;
  • has the form of a profile of an isosceles triangle with an apex angle of 55 degrees;
  • has a larger step. This feature means that the profile of an inch thread is larger and the strength of the connection is higher.

All types of threads are used in various cases. But it is worth noting that the right one is found literally at every step, but the left one is much less common.

Thread cutting. Necessary concepts

This process is the processing of a rod or hole using a special tool for tapping pipes in order to obtain external or internal alternate protrusions-turns and spiral grooves.

The main characteristics of the thread are:

  • step. This is the distance between the tops or bottoms of adjacent turns;
  • profile. The cross-section at the turn can be trapezoidal, triangular, rectangular, etc. In the details of sanitary systems, only a triangular profile is used;
  • profile angle. It is formed by the crossed sides (lateral faces) of the turns;
  • depth. This is the distance from the top to the bottom of the thread;
  • outer, middle and inner diameters.

Outside is equal to the distance between the points of two opposite sides of the thread. Average diameter ˗ is the distance between the top and bottom of the profiles that are on opposite sides of the part. Inner represents the distance between opposite valleys.

READ  Can I Cut a Disc By Stone

Any thread has its own technical characteristics


The main methods for creating a thread are as follows: 1. cutting with threaded cutters or threaded combs; 2. cutting with dies, tapping heads and taps; 3. rolling with flat or round knurled dies; 4. milling with special thread mills; 5. grinding with abrasive wheels.

Cutting of a thread with incisors. Using threaded cutters and combs on screw-cutting lathes, both external and internal threads are cut (internal thread, starting with a diameter of 12 mm and above).

The method of threading with cutters is characterized by a relatively low productivity, therefore, it is currently used mainly in small-scale and individual production, as well as in the creation of precise screws, calibers, lead screws, etc. The advantage of this method is the simplicity of the cutting tool and relatively high accuracy the resulting thread. Schematically, it consists in the following: with the simultaneous rotational movement of the part on which the thread is cut, and the translational movement of the cutter (on a lathe. II), the latter removes (cuts out) a part of the surface of the part in the form of a helical mowing line (I).

Tapping with dies and taps. In fig. 33 shows the dies, which, according to their design features, are divided into round. I and II (levers) and sliding. III (kluppovye).

Round dies, which are used in assembly, procurement and other works, are designed for cutting external threads up to 52 mm in diameter in one pass. For larger threads, special design dies are used, which actually serve only to clean the thread after preliminary cutting with other tools.

Sliding dies consist of two halves that are inserted into the die and gradually converge during the cutting process.

When threading on metal-cutting machines (II), the die is installed and fixed in a special chuck or device. The part is fed into the calibrating part of the rotating die. In most cases, the internal fastening thread is cut with taps.

The tap is a threaded steel rod divided by longitudinal straight or helical grooves that form cutting edges. The same grooves serve for the exit of chips. According to the method of application, taps are divided into manual and machine.

The sequence for obtaining a thread in blind holes is as follows: first, a socket is drilled, where a pin or screw will be screwed in the future. Drill diameter should be selected from table. values ​​recommended by GOST 9150-81. The thread is cut with a set of two or three taps (small, medium and normal, fine), depending on the size of the thread. It is not possible to cut a thread with one tap (normal) at a time. This will break the tap.

For metric coarse threads and inch threads, the set consists of three taps, for metric coarse threads and pipe threads, two.

Thread rolling. The main industrial method of manufacturing threads at the present time is rolling on special thread rolling machines with a three-roller head body 1, a roller holder 2 and a rolling roller 3 Part 4 is clamped in the vice of a caliper. In this case, with high productivity, a high quality product (shape, size and surface roughness) is obtained.

The thread rolling process consists in creating a thread on the surface of a part without removing chips due to plastic deformation of the surface of the workpiece. Schematically, it looks like this. The part is rolled between two flat dies (Fig. 38. I) or cylindrical rollers (Fig. 38. II, III) having a threaded profile, and a thread of the same profile is extruded on the rod. The largest diameter of the rolled thread is 25 mm, the smallest is 1 mm; length of the rolled thread 60.80 mm.

Thread milling. Milling of external and internal threads is carried out on special thread milling machines. In this case, a rotating comb cutter, with a radial feed, cuts into the body of the part and mills the thread on its surface. Periodically, there is an axial movement of a part or cutter from a special copier by an amount equal to the thread pitch during one revolution of the part

Fine thread grinding. Grinding as a method of creating threads is mainly used to obtain accurate threads on relatively short threaded parts, for example, screw plugs. gauges, thread rollers, etc.

The essence of the process lies in the fact that a grinding wheel located to the part at an angle of thread rise, with fast rotation and with simultaneous slow rotation of the part with feed along the axis by the amount of the thread pitch in one revolution, cuts (grinds) a part of the part surface. Depending on the design of the machine and a number of other factors, the thread is ground in two to four or more passes

Internal thread

An internal thread is cut in the hole using taps (1). They are metal rods with hardened teeth. Manufactured from tool steel or high speed steel.

Taps are distinguished by purpose. They can be used to cut metric, inch, tapered, pipe and trapezoidal threads. According to the relevant technical conditions, as well as GOST 3266-81, the table shows the limits of applicability of this tool.

Thread name Nominal diameters
Metric 1. 52 mm
Inch 1/4 “- 2” (inch)
Conical 1/16 “- 2”
Pipe 1/16 “- 6”
Trapezoidal 5.6. 90 mm

Taps for cutting metric and inch threads are manufactured in sets. The set can consist of two, finishing and roughing, and three. rough, middle and finishing taps. The roughing tap is designed to remove the main part of the chips. Finishing is used for the final, accurate shaping of the thread profile and calibration.

To identify a tap in a set, its tail is marked with one, two or three ring marks. It is also possible to designate with a number: I. rough, II. medium, III. finishing.

Nut taps are designed to cut threads in one pass. They are one-piece, that is, they are sold per piece.

To rotate the taps, use a wrench (2). They can be fixed size square shank holes as well as adjustable. In addition, there are ratchet wrenches for easy handling in tight spaces.

How to cut a thread. types and purpose of the tool

Due to their high reliability and simplicity, threaded connections are widely used in various building structures, machines and mechanisms. Since the basic geometric parameters of threads are generally accepted, it is enough to have a small set of standard tools to create new connections and repair worn assemblies.

External thread

Manually the external thread is cut with dies (5) and dies (4). The die is a round nut made of high-speed or high-hardness tool steel. For the purpose of removing chips, special holes are provided in it. Dies are solid and cut.

Split dies have a slot up to 1.5 mm. Thanks to this, they allow you to adjust the diameter of the cut thread in the range of 0.1-0.3 mm. Their disadvantage is less accuracy, therefore, it is not recommended to use such a tool in critical connections. The diameters of the dies are presented in the table.

Thread name Nominal diameters
Metric 1. 76 mm
Inch 1/4 “- 2” (inch)
Pipe 1/8 “- 2”


Rotation of the dies is carried out using ram holders (3) and ratchets. These devices usually allow the use of several cutting tool sizes, eg M16. M20, 1/2 “- 1”. Ratchets are used for cutting pipe threads with dies in hard-to-reach places, for example, near a wall.

The dies are designed for cutting external pipe threads with a diameter of 1/2 “- 3”. Due to their design, they are securely fixed to the pipe, which ensures ease of use, as well as high quality of the threaded connection. Klupps are usually equipped with replaceable cutters or heads. This significantly increases their service life. Depending on the design, both removable handles and ratchet holders can be used to rotate the manual die blocks.