Which knife for a lawn mower is better to choose. What manufacturers deserve trust?

Criteria for choosing discs for trimmers for grass and instructions for replacing them

Trammers’ grass ugos occurs due to the use of a mowing head with a fishing line and metal disks. Each type of cutting device has its own fundamental features. The use of the fishing line is limited to the type of vegetation, therefore, where the head with the cord does not cope with the task, a metal disk is used. How to choose a cutting disk for a trimmer for grass, what they are, and how they are hidden, we find out the details before buying an appropriate equipment.

Initially, we note that metal discs can be used not only on gasoline, but also electric trimmers. The main condition for the use of metal cutting knives on the equipment. in the design of the tool, the transmission mechanism (shaft or gearbox) should be a rigid type. A hard.type gearbox is a metal shaft transmitting a torque from an electric or gasoline engine to a working organ.

There are models of trimmers with flexible shafts, the design of gearboxes in which is represented by a steel cable. These are, as a rule, low.power electrical grass drivers that are not intended for large loads, as well as household lawn mowers. You can’t use metal disks on trimmers with a flexible shaft (only plastic), as this will lead to a rapid failure of the gearbox. Before buying metal cutting mills, you will need to find out the type of gear ratio of your tool. hard or flexible.

What type of gear ratio is used on the trimmer is indicated in the technical description to the tool. If a trimmer for grass has a curved bar, then a flexible shaft is used in its design. Tools with direct bar can be equipped with rigid and flexible gearboxes, which depends on the power of the trimmer for the grass.

Trimmer knives are classified according to the following signs:

  • Manufacturing material. they are plastic and metal. Plastic knives are less effective than metal, but they do not have a large load on the shaft and the drive mechanism of the tool. Plastic discs are used on electric trimmers and household benzos
  • The design of cutting devices. Steel discs are of two types. blade and toothed (milling). Plastic knives are produced in the form of blades. Tough devices have a similar design with circular discs, and lobed have large flat knives
  • The number of cutting edges. The number of teeth and knives on the disks differs, which affects the performance of cutting equipment. On gear discs, the amount reaches 80 links, and on blade. from one to four pieces
  • The presence of additional spraying. steel gears are additionally equipped with winning attacks, which allows you to use a tool for driving grass on mound surfaces. When the disk is contacted with obstacles in the form of earth and stones, the teeth are not deformed and do not dull, which is achieved due to the presence of winning attacks. Experts say that devices with carbide attacks do not serve for long. Attacks wear out quickly, and then the milling cutter is used without winning

Plastic knives for trimmers not only cost cheaper than metal ones, but also do not have high loads on the engine and transmission mechanism. This is especially true when the knife stumbles upon obstacles. The higher the elasticity of the cutting knife, the less likely the deformation of the plastic disks.

It is interesting! Rosted wheels with a large number of links are used to prick different grass. dry, green lawn and thick.nisted. The cut with such a disk is straight, clean and even. In addition, a large number of teeth excludes their rapid dullness, and the presence of additional holes on the surface of the circle (penetration) is intended not only for cooling, but also to reduce weight and increase inertia.

The advantages of trimmer disks compared to the fishing line

Trimmer disk compared to the cord, has its advantages. You need to know these advantages in order to decide in the end whether to buy and use metal cutting knives. Consider all the advantages of the trimmer disks:

  • The ability to cope with different vegetation, unlike fishing line. It can be dry, long and thick.nisted grass, and even small vegetation. The fishing line for a trimmer hardly copes with medium.sized grass, and it is not able to cut off thick.stubble grass. The cord will either get confused for the grass, or the fishing line for the trimmer will wear out quickly, which is not at all rational
  • High speed achievement of the result. Unlike fishing line, the disk cuts grass with qualitatively (with good sharpening), without leaving “roosters”, therefore, a mowing trimmer with a metal circle occurs faster than when using the cord
  • Discs do not wear out, unlike the cord. The cutting knives or parts of the circle are blunted, but the issue is resolved by hiding. How to sharpen a trimmer metal circle described in the material below. With prolonged operation, the cutting devices are abrasion, but they are enough for at least 3-5 years
  • A long service life, in contrast to the fishing line, which is associated with the design of the equipment

There are also disadvantages of the considered cutting devices for trimmers. The first drawback is that it is impossible to work with a disk tool when the grass is performed next to obstacles in the form of trees, buildings, stones, shops, etc.P. When a disk collision with an obstacle, the drive is inhibition, which is reflected in the form of such minuses:

  • The engine overheats
  • The cutting parts of the disk that are blunted are damaged
  • Transfer mechanisms. flexible and hard shafts (gearbox) come out of order

If you plan to mow thick grass in the field, then do without a trimmer for grass with an installed metal disk, it is impossible. The fishing line for a trimmer is used to prick small grass in personalities near obstacles.

It is interesting! On trimmers with a curved rod structure, you can not use steel discs due to safety. If the disk attaches an obstacle, then the effect of returns arises, through which the cutting part can fall under the feet of the operator. As a result, the operator risks getting serious injury.

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What shape to take a disk?


In gear nozzles, the number of teeth can vary from 2 to 80, and this affects what type of grass or shrub can mow a trimmer for grass. By the number of teeth, such nozzles can be:

  • With 2 teeth. for mowing the lawn, soft low grass.
  • With 3 teeth. for young and weed grass, you can also mow dough.
  • With 4 teeth. for small shoots and hard grass.
  • With 8 teeth. for high grass like hogweed. The grass is not much crushed, but any shoots lie down.
  • With 24 teeth. perfectly copes with a small shrub.
  • With 40 or more teeth. are designed for professional powerful trimmers that can cut down dry, shrubs and young trees. The thickness of the trees should not exceed 70 mm.

From personal experience, let’s say that 8-dash discs do a great job with most shoots and weeds in the garden, so for regular (if you mow once a month), we recommend taking them. If you have a lot of high grass, it is better to take a nozzle with a large number of teeth. the grass will not be wound.

Average, it will be enough for several seasons. But if you are used to brand accessories, take a disc from Husqvarna or Stihl. True, such discs cost from 1200 and above.


The main advantage of lobed knives in small weight compared to gear. These discs can be used not only for weeding weeds, but also to make hay for livestock. They give a lesser moment of inertia, which positively affects the drive mechanism (less wear) in the number of blades of the discs:

  • With 2 blades. for mowing soft grass of the same type. Two.lobed knives give the greatest grinding of grass. During operation, the blades additionally discard the grass to the side.
  • With 3 blades. for mowing high weed grass.
  • With 4 or more blades. for the procurement of hay. The more blades, the less grass is crushed.
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If you have practically no shoots in your country house, and only woody grass grows, a lobe disk is quite enough. Given the low weight, it can be put on almost any, even low.power electric braid.

What material to take the disk from?

Disks for trimmers are made of these materials:

Plastic. Plastic knives are designed for mowing of dry or tall weed grass such as burdock or nettles. In comparison with metal, they have a low weight, so they can be put on low.power models. In particular, we note that electrical household trimmers for grass can only work with plastic ones (we do not recommend that heavy metal disks). However, you can’t download branches with them, since the knives will break about the first tree.

Steel. Only gasoline trimmers for grass can work with steel disks. Unlike plastic, metal nozzles do a good job of any kind of grass, shrub and shoots of trees. In contact with a solid surface, the blow is extinguished with a coupling. It is also worth noting that special nozzles with winning tips are used to trim grass on rocky soil (only not as thick as on a circle for angular grinder).

So still buy: plastic or steel? If you have an electric trimmer for grass, then without options. only a plastic disk. But motokos can work with both material, so you should pay attention to the type of mowing grass. If there are at least a little overgrown, then it is better to take a steel disk.

Classification of knives for lawn mower

To provide the lawn mower to the lawn of impeccable functionality for a long period, you need to know which supplies to install on the tool, what knives are there at all. To equip modern braids for the lawn, cylindrical (drum) and rotary cutters are used. The dimensions of the cutting elements fluctuate in a fairly wide range. from 33 to 51 cm.

In the instructions for the operation of lawnmands, manufacturers indicate which knife is compatible with a specific model. If you install a smaller knife, labor productivity will decrease, if more, the load on the engine will increase.

The safety of the operation of the tool depends on the material of the knife manufacturing. Manufacturers produce stainless steel and plastic cutters. Steel cutting elements are more functional, they quickly and effectively cut vegetation, are considered more reliable and durable. But when the lawn mowed on a stone or another hard object is hit by a metal knife can fly apart and injure the operator. A wreckage of a plastic knife is more harmless. A universal plastic knife with a large number of blades not only cuts off, but also grinds the grass, after which it can be used to feed the lawn.

Configuration of knife blades

According to the configuration, knives for the lawn mower are classified into blatant and non.disabilities. The former can have a different number of blades, but not more than 8. In the shape of the blades, the knives are divided into:

  • Simple. the blades are made in the form of long rectangular segments;
  • pointed. endings are dihedral bayonets;
  • rounded. there is a smooth curvature of extreme faces.

Helpable knives are also called cutters. In appearance, cutting elements resemble a disc saw. The number of cloves can reach several tens.

Rating of the best manufacturers

To determine which manufacturers are the most reliable and effective, it is necessary to deal with who actually produces them.

The problem is that manufacturers of garden equipment are not engaged in the manufacture of discs, giving this work to other enterprises, which are often their partners.

Therefore, when you see a gear circle under a well.known brand and making sure that this is not a fake, you can be sure of one thing. the owner of the brand, although it is not a manufacturer, but guarantees the high quality of this product.

Here is a list of manufacturers of garden equipment (their peculiar rating), under the brand of which the most durable and reliable gear disks are sold:

However, discs under these brands are not popular, because their reliability exceeds the same parameter of inexpensive analogues by only 5–25 %, while the price is 2-4 times higher.

Therefore, gear circles under the following brands are more popular:

How to choose?

To choose the right tooth circle, answer these questions:

  • that you are going to mow it;
  • What is the power of your trimmer for grass;
  • How often do you plan to use an electric. a lawn mower with a gear circle installed on it;
  • Can you sharpen the disk yourself;
  • how much are you ready to pay for a toothed cutting tool.

The answer to the question “what to mow” will help determine the type of disk that is the best for your site, and our table will help you with this.

In addition, mowing for senage and mulch is distinguished by the requirements for the finished product, or rather, to the degree of grinding.

For mowing, the disk is not suitable for mulch, because it almost does not grind the vegetation, while the knife is unsuitable for harvesting the senage, because it not only cuts, but also cuts any vegetation into small fragments.

Therefore, the more goals you need cut material, the more teeth should have a disk. The power of the trimmer for the grass determines the maximum size of the gear circle, which can be installed on it.

For devices with a power of less than 1 kW, small gear circles with an external diameter of 20 cm are better suited.

For trimmers of 1.5 kW, a cutting tool with an outer diameter of 23 cm is suitable, and on more powerful models put wheels in size 25.5 cm.

If you plan to use a gear circle 2-3 times a year, and even only for mowing weeds or a high multi.grass, then there is no point in buying an expensive tool with winning attacks. It is enough to purchase an ordinary eight.toothed Chinese disk.

For more frequent use, a carbide tool is better suited, because it is much more reliable and universal.

And for a professional mowing, use the most reliable discs. they will cost an expensive one, but they will last noticeably longer, especially if they are correctly and carefully tightened.

We have already talked about various ways to sharpen the gear circles, so read the article sharpening the disk and determine for yourself whether you can perform such operations with your own hands.

If you can, then there is no point in buying an expensive tool that is only a little cheap in reliability, because it will still have to sharpen it sooner or later.

Lobbie’s winding on a trimmer head

On the rogue you can wind from 3 to 10 meters of fishing line. When mowing the grass, nylon wire is abrasion, so each time you need to set new segments. You can perform this task in one of three ways:

After the fishing line for the trimmer in the spool is over, it is necessary to season it. There are two methods of refueling the tool: fast.charged and manual. Installation of fishing line manually is carried out according to this scheme:

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  • unscrew the spitt and remove the lid;
  • deinstall the coil;
  • measure the length of the fishing line, cut off 3-4 meters;
  • fold the wire;
  • insert the ends of the cord into the holes;
  • tighten the coil, insert the lid into place;
  • To adjust the ends of the fishing line.

The fast.fast method is simpler and simpler. There is no need to disassemble the coil. You just need to insert a loop and insert it into the hole, carefully crank the mechanism that quickly wraps the wire on the bobbin.

Types and use of knives for a trimmer for grass

Knives significantly expand the scope of the use of trimmers. The cutting elements mow high grass, cope with shoots, thickets, shrubs. Electric trimmers for grass, which are less productive compared to gasoline units, are equipped with plastic knives. But productive lawn mowers are equipped with metal cutting elements.

On the execution of the cutting edges, products are divided into continuous, gear, oenicized. The selection of the size and design of the knife depends on the goals of use, the features of the bar and engine performance.

What is the disk intended for?

The main purpose of the knife, to which even a saw disk can be attributed to some extent, is a neat separation of the plant into two parts, the upper and lower.

Thanks to a sharp blade, they carefully cut the fibers, so the edge of the grass is even and the plant almost does not get sick after such a haircut.

By the same principle, the knife also affects high dense vegetation, however, the harder the material, the higher the probability of damage to the blade.

Conventional knives are made of soft metal, so that when hit the blade is deformed and protects a noticeably more expensive gearbox from damage.

The knife effectively cuts high thick grass, because it does not wear out like a fishing line, and acute face cuts fibers with minimal energy consumption, which reduces the load on the motor.

With a mowing high, but soft or juicy vegetation with a thin flexible stalk, the knife is ineffective, because cut fragments are often wound on it, which is why you have to stop the work and clean the trimmer for the grass.

This cutting tool copes well with the young growth of trees or shrubs, however, if the diameter exceeds 5-10 mm, then the knife damage is possible.

If you need to dig grass, among which not too young shoots of shrubs or trees grow, then use a saw (toothed) disk, it copes well with shoots with a diameter of 10–20 mm.

There is a rule. the tougher or thicker the grass, the more teeth or cutting faces are necessary to achieve maximum efficiency, which is why the disk is very inferior to fishing line and a two.blade knife with a mowing of soft grass, but exceeds them when spinning high hard vegetation.

Which is better in different conditions?

We compiled a table in which we included grass of various types and described the effectiveness of each type of cutting tools:

Type of vegetation Lines for a trimmer Knife Disk
Well.groomed lawn grass Greatly injures (soaks) stems, because of which plants are sick for a long time Carefully cuts off the tops, plants almost do not get sick after mowing Tears and soaks the stems
Low multi.traffic Cuts quickly, crushes well Cuts quickly, crushes well Cuts quickly, crushes poorly
High green multi.veravier (hay harvesting) Strongly loads the motor, wear out quickly, greatly grinds the senage, effectively cuts the grass Minimally loads the engine, often gets confused, efficiency below the average Almost does not grind the senage, slightly loads the engine, if you do not put in the rolls, then soon the cut material begins to interfere with the work
High dry multi.traffic Quickly wear out, efficiency depends on the shape and diameter Maximum efficiency Maximum efficiency
Vygravye Vytravye You can mow close to the trees without damaging their bark You can not mow close to the trees, the risk of damage to the knife or bark is high You can not mow close to the trees, a high probability of bark damage
Low grass on an uneven or rocky area Maximum efficiency, quick wear Cannot be used, there is a high probability of tool damage Cannot be used, there is a high probability of tool damage
High grass on an uneven or rocky area The greatest efficiency in rehabilitation, but cut off the upper part of the grass, but severe wear of the fishing line Effectively cuts the upper and middle part of the grass, you can not finish, because the risk of tool damage is high Effectively cuts the upper and middle part of the grass, you can not finish, because the risk of tool damage is high
Mowing herbs with a shoot of trees or shrubs Can only be used if the shoots are not weeded (a maximum of 5 mm) Can be used if the thickness of the shoots does not exceed 8–10 mm Can be used if the thickness of the shoots does not exceed 20 mm

A knife for a trimmer for grass: when to use and which one to choose?

The use of a trimmer for grass in country and household plots greatly simplifies and accelerates the bevel of grass. However, it is important to choose the right “consumable” for an electro-benzotrimmer. Simply put, what exactly you will mow the grass: the cord (special trimmer fishing line) or with a knife. Both a fishing line for a trimmer, and a knife is equally well suitable for mowing grass in hard.to.reach places, but in which cases a knife is more effective?

When is it better to use a knife for a trimmer for grass?

Most often, it is a fishing line for a trimmer, as it is safer in operation and provides almost the same result when begging grass. But if you have to mow quite high grass, you will certainly faced the fact that long stems will be wrapped in a coil or spendel at the place of attaching the head of the trimmer for the grass. To avoid this, it is recommended to use a knife. a cutter for a trimmer for grass.

The milling cutter will also be more effective if you need to mow dry grass, shrubs, burdocks, nettles or hogweed. The only thing that a knife can be afraid is a collision with a stone.

A trimmer knife can be made of both plastic and metal. To each model of a trimmer for grass, its type of knife is originally supplied (or offered by the manufacturer). This is due to the shape of the trimmer bar for grass and is done in order to secure the user as much as possible. Therefore, you do not need to take a metal knife if your model of a trimmer for grass involves the use of plastic. Even if you are assured by the versatility of a knife.

A knife for a trimmer for grass can look like a special braid (trimmer) head with circuit plastic blades, or be a whole design, for example, a disk knife with a different number of blades (as a rule, such models are made of metal).

A trimmer for grass with a metal knife will help to get rid of not only grass, but also thickets of shrub or young trees. Also, a trimmer can be loaded with raspberries and currants.

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Basic safety rules when using metal knives for a trimmer for grass

A metal knife for a trimmer for grass is installed only on units with a straight bar. This is due to the design features of the tool. When, when mowing grass (bushes, thin trees), the disk stumbles on an obstacle (usually stone), it most often bounces back. towards the user. Trimmers with a directly barbell distance from the head to the toe of the human legs are quite safe.

Also, such trimmers for grass are held by the user using T (U) or J-shaped handles, and if the handle D (O) is shared, then a special restrictive bar is included in the kit, which rests on the leg and gives him to approach the cutting tool.

If your knife bent when a collision with an obstacle, do not rush to change it. You can alien it yourself with a hammer. The flexibility of the knives is designed to reduce the load on the engine and the transmission.

The experience of professionals and ordinary users showed that the shape of the blade only matters if you mash the grass for harvesting for the winter, such as hay of animals, since three and four.lobed knives too grind grass. But the quality and speed of the bevel with different blades do not differ significantly.


The most popular knife model for a trimmer for grass is a round shape with eight teeth around the circle. Also, it is often used by its variety: with four large teeth and small between them.

And for the bevel of shrubs (raspberries, currants) and thin young trees most often use a regular disc with many teeth. It can be installed on any trimmer for grass, even with slight power, and effectively process the site.

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The inconsistency of the length

If we have an original knife with a length of 20 inches, then he needs to make a nozzle of the same length to replace. This is what happened to another owner of the lawn mower. To replace his 20-inch knife, he acquired universal American origin. As a result, when measurements, it turned out that the knife has a length of 494 mm, although the passport indicates it that it is 20 inches long, which corresponds to 508 mm. the difference is as many as 14 mm. Of course less, and you can put a knife, however, with large sizes of the site, it will have to cut the lawn longer, since the width of the mowing will be smaller.

It happens that the owner comes the knife in size larger than the original, then he simply will not fit into the lawn mower or will cling to protection. We still recommend ordering original knives in the service center or at least similar to “native” in online stores.

The inconsistency of the thickness

This parameter is not critical for lawn mowers, but it can create some difficulties. Often non.original nozzles have less thickness than native knives. A non.refirm knife can rarely be found thicker than 4 mm, while branded nozzles have a thickness of 5. 6 mm. A knife of smaller thickness will have to be sharpened more often, and it will fail faster.

In appearance, all knives are the same: visually you do not distinguish one brand from another. Meanwhile, if the manufacturer has saved on the material, the edge will quickly stupor, you will have to tighten more often. By the way, recently we told why not to sharpen yourself.

Making the frame

At the first stage of the independent manufacture of mowing for grass, a frame base is performed for the location of the motor part. For the frame, you can use a relatively thick plywood, but the best option will be a metal sheet with minimal indicators of 3.0-3.5 mm thickness. Such material has good resistance to any deforming effects.

Lawn mowed with a metal frame

The dimensions of the frame are determined taking into account the length of the knife and the width of the unit, but the most convenient in operation is a lawn mower of a size of not more than 0.5-0.6 m. For manufacturing, it is necessary to cut a square element from the sheet material, the sides of which correspond to the width of the manufactured device. In the central part of the workpiece, you need to make a hole for installing the motor.

It is necessary to fix the flange engine to the frame base with the direction of the shaft down, and the “ears” of the motor allow you to perform additional fastening to the unit frame.

Varieties of lawn mowers depending on the power unit

Types of lawn mowers by type of engine are limited by two options. electric and gasoline. Diesel engines in these machines (with the exception of some models of mini-tractors and riders) are not used due to large weight, complexity of the design and low rotation of the shaft rotation.


Trammers for grass and lawn mowers with electric motors are very convenient in small areas near the house. They are productive, low.noise, light, do not require complicated maintenance. There are very few requirements during operation. The main ones are not recommended to mow wet grass and not overload the engine, it should work at stable speeds.

With large loads and a frequent decrease in rotation frequency, the engine overheats, which leads to its failure, and repairing such motors is expensive and difficult. In addition, the cable stretching behind the lawn mower or trimmer is not only inconvenient, but also limits the radius of the working area. If you have to mow between the trees, then it is better not to find a gasoline trimmer for grass.