What is a rigging shackle? Rules for use and standard sizes according to GOST for omega-shaped and straight lifting shackles

A lifting shackle is often used to work with various lifting mechanisms. Its purpose is to ensure reliable connection between the elements of lifting devices - cables, ropes, etc. Despite the extreme simplicity of the design, the dimensions and designs of lifting shackles are standardized by several GOSTs, departmental standards, as well as foreign standards (in particular, DIN 82101).

Features of use

If it is necessary to create a permanent or long-term connection, it is recommended to use clamps with safety bolts.
If the connection is unstable, it is better to give preference to devices with a screw pin. In addition, for each specific case it is necessary to select brackets with suitable load capacity. It can range from 330 kg to 150 tons. The pin must not only be screwed all the way into the hole in the bracket, but also additionally clamped with a key. If incorrect seating of the pin is detected, the device cannot be used for work. In this case, the pin can be replaced with similar characteristics. It is prohibited to put into operation rigging shackles with visible external defects.

How to extend service life?

Conventionally, measures to extend the service life of the chucks will be divided into two points:

Proper storage

Correct operation

Proper storage

First, let's look at the main points related to sling storage.

Organize a storage location for gas supplies that is protected from the effects of destructive factors. Hot metal, paint, petroleum products, chemicals, the movement of any mechanisms in the storage area - all this can damage the jig.

Store slings hanging or on designated racks. This is especially true for rope slings. Twisting and storing on the floor or ground will cause premature failure.

Do not store rope and textile slings near sources of high temperature (near a heating boiler or blast furnace). Synthetic fabric may simply melt. And the lubricant with which the rope core is impregnated actively comes out when heated and is quickly wiped off while working with the rope. Over time, this will cause rust and friction of the dry lay wires, which will lead to their rapid wear and breakage.

Correct operation

To a greater extent, the service life of the chucks is influenced by proper operation. To extend the life of the slings, adhere to the following rules.

Use the chawls as intended. Move hot workpieces and containers with molten metal using chain slings. Transport loads without protruding sharp surfaces using rope or textile slings. For northern regions, use special slings with climatic modification HL.

Do not exceed the permissible load capacity. The increased load will lead to stretching of the jaws and deformation of the chain links, changing the structure of the rope or fabric lay.

If the cargo has mounting loops, use them. Slinging methods not specified in the instructions are a common cause of damage to the chucks or loss of the load.

Avoid direct contact of the wire rope with angular loads. Use underlays with smooth transitions on the contact surface of the slings. The backings will protect the braces from bending at sharp angles. The bend in the rope sling resulting from slinging angular loads cannot be straightened out.

Do not use chucks to release pinched or frozen loads. Dynamic loads in this case can damage the gas protection system.

Do not drag even light loads with slings without lifting them off the surface.

Correct non-critical damage to slings in a timely manner. Repair damaged hook locks. Remove defects from the outer surfaces of the thimbles. If the ends of the beams are secured with clamps (DIN 1142 or DIN 741), be sure to ensure that all plates and fastening bolts with nuts are in place.

Also make sure that identification tags are present on all used jaws. Do not forget to inspect the slings once every 10 days and record them in the inspection log of the gas station. Remember: in the event of a load loss incident, the inspector will first remove the inspection log.

How to choose the standard size of a lifting shackle?

The selection parameters are the maximum load capacity that is allowed by the product (in this case, the standard safety factor must be at least 5), the dimensions of the bracket in plan, and the operating conditions of the product. In particular, it is not allowed to work with rigging brackets whose surface has at least one area of ​​corrosion; That is why parts that have been galvanized or painted with paints that are resistant to high ambient humidity are predominantly used. The price of galvanized rigging shackles is always higher than painted ones.

The method of stamping the staples is also important. In particular, when cold bending a rod, significant bending stresses arise in it, which reduce the strength of the part during its operation.

Hot-stamped rigging brackets after deformation are subject to descaling and subsequent heat treatment, so their hardness ultimately reaches the same standard values ​​- for conventional steels HB 155...160, for stainless steels HB 280...310, but there are no stress concentrators.

You can check the functionality of the rigging bracket using the following dependency:

— Q – design load on the product;

— Mmax — the greatest bending moment that occurs when lifting a load (set according to the brand of the sling);

— r – radius of curvature at the transition from the bracket’s mouth to its walls.

There are practical relationships between the diameter of a shackle and the largest load that can be lifted with it. For a straight bracket made of carbon steel, these ratios are given below:

• At d = 5 mm Q = 80 kg;
• At d = 10 mm Q = 300 kg;
• At d = 16 mm Q = 800 kg;
• At d = 22 mm Q = 1500 kg.

For omega shackle:

• At d = 6 mm Q = 330 kg;
• At d = 10 mm Q = 750 kg;
• At d = 16 mm Q = 2000 kg;
• At d = 25 mm Q = 6500 kg;
• At d = 32 mm Q = 9500 kg.

Prices for rigging shackles, depending on the method of their manufacture, design and size, range from 80...5000 rubles.

The areas of application of rigging shackles are quite diverse. Depending on the type of product, they can be found both in everyday life and in mechanical engineering or during construction work. But not everyone knows how to use these products correctly. So, let's look at the main nuances.

The first, and one of the main rules, says: while working with staples, you cannot perform any types of heat treatment. The use of, for example, welding can significantly reduce the lifting properties of the device in question.

The next point to remember is that when securing the material being moved, the pin must be screwed into the eye all the way. The eyelet and pin shoulder should fit together as closely as possible. To ensure maximum “wrapping” of the pin, it is necessary to use tools that will ensure that the element is screwed into the eyelet to the full depth of the thread.

Third point: the standard sizes of the pin and bracket must match. Otherwise, the shoulder pad will not fit properly. Also, an incorrect fit may be a result of tight threads, a bent shape of the bracket, or other defects. If such defects are present on the device, then it cannot be used and needs to be replaced.

When deciding to buy a rigging shackle, you should take into account the likelihood of shock loads when moving materials. Considering the conditions in which the bracket will be used, it is necessary to choose the product whose load capacity will be maximum

When working with the products in question, it is extremely important to avoid overloading the rigging. The weight should be distributed equally along the linear axis of the bracket, i.e.

at right angles to the axis of the pin. If this condition is not met, then angular loads occur. The latter are acceptable, but should not contradict the requirements of GOST. In the area where the bracket is attached to the slings, there is a high probability of additional load on this shoulder. This indicator regulates the mounting angle - the lower its value, the less the load. It is also impossible to allow the load to be distributed not along the axis of the bracket. To eliminate this possibility, spacer washers are attached to the ends of the pin.

When working with the products in question, it is necessary to ensure that the load remains stationary throughout the entire path of its movement. This is necessary because rotation of the material is almost always accompanied by unscrewing of the pin. To prevent this, clamps with a safety bolt should be used.

Following these simple recommendations will allow you to avoid dangerous incidents and significantly extend the service life of the used rigging bracket.

Model rules

The slinger must work when he has a sling diagram. It may not always be at hand. Therefore, for loading or unloading, it is necessary to know and apply the rules of slinging according to standard schemes.

1. Building elements (slabs, blocks, etc.) are moved with hooks and special loops. In this case, the number of slings and loops is selected equal, otherwise the structure may collapse.
2. Loads no longer than 2 m are moved using a ring sling on a noose.
3. Long items are captured by the loops of two slings at a distance from the edges of no more than 1/4 of the length. The angle between them should not exceed 90 due to the correct choice of their length.
4. Sheet metal is moved using special eccentrics or clamps. To avoid damaging its surface, linings made of wood, rubber, etc. are used.
5. Slinging of equipment is carried out using special rigging: loops, mortgages, hooks, eye bolts, etc.
6. Unused sling branches should not interfere with transportation. They are strengthened so that when moving the ends do not touch oncoming objects.
7. Sagging or bending of the sling on the edges of the load is not allowed. The cables are loaded evenly.
8. The hook must fit the size of the loop or eyebolt.
9. Rigging work must be carried out in the presence of a person responsible for their safety when there is a non-standard or developed slinging scheme.

The crane operator is given the following commands:

• myna - lowering;
• vira—rising;
• hare—stop.

Lifting brackets (OST5R.2312-79)

Rigging shackles are used to quickly and securely connect sections of ropes and chains or attach them to a butt, eye, etc. They are a semicircular or omega-shaped bracket, the ends of which are connected by a bolt or pin.

Often the rigging bracket is equipped with a safety nut or pin, which prevents arbitrary opening.

There are general-purpose and lifting shackles. Higher quality steel is used to make lifting shackles. The permissible load for which the bracket is designed can range from 200 kg to tens and hundreds of tons.

All products comply with state and industry standards.

Lifting shackles type SA

Lifting shackles (earrings, shackles) type CA are designed for fastening steel ropes and chains. They are used as part of lifting and static systems as removable ties.

Using brackets you can attach to the equipment:

• wire chains
• steel cables
• various kinds of devices.

The shackle pin is required for steel ropes. SA lifting shackles have a durable galvanized coating. Their safety factor is 6:1.

Marine single-pulley block for signal flags MSK 1-100 Lifting shackles type SB

Lifting shackles (earrings, shackles) type SB straight with an axis are designed for fastening and tensioning rigging equipment. With its help you can attach directly to the object being unfastened:

• cables,
• chains,
• ropes and so on.

The safety factor is 6:1. A reliable galvanized coating is applied.

The bracket type SB is a metal loop made of a round profile, which makes it possible to quickly connect and use a chain, cable, rope. The holes located at its ends are connected by a “finger” - a special transverse element. .The standard size of the product is determined by the permissible working load in kN and tons.

Lifting shackles type P

Lifting shackles type P, made of high-strength steel, are designed to work with plant ropes and are a metal loop with holes at the end for connection with a finger or a pin. This is a reliable cross member. Products are used in devices:

• ships,
• ships,
• other floating craft.

They are designed for quick and reliable fastening in rigging devices and devices. Their safety factor is 6:1.

The bracket and screw are durable galvanized. Sling arc-shaped brackets type P with a safety bolt are indispensable in lifting and static systems. They serve as a connecting element for fixation.

Clamps with screw pins allow you to solve temporary problems, tr

ACCEPTANCE RULES

5.1. To verify compliance of slings with the requirements of this standard, the manufacturer must conduct acceptance tests.

5.2. During acceptance tests, each sling is checked for compliance with the requirements of paragraphs. 3.7 - 3.10, 3.12 - 3.15 and 3.17.

For compliance with the requirements of paragraphs. 3.3 - 3.22 check 10% of the slings from the batch in the case of sealing the ends of the ropes by crimping aluminum and steel bushings, including the first and last sling, and 2% - in the case of sealing the ends of the ropes with braiding.

The total number of slings being checked should not be less than 2.

A batch of slings must consist of products of the same type and load capacity, made from rope from one drum (coil) and parts from the same batch.

A batch of parts must consist of parts of the same standard size, made of the same grade of metal and undergone heat treatment together.

When manufactured individually, each sling is checked for compliance with the requirements of clause 3.3.

(Changed edition, Amendment No. 2).

5.3. Hooks, carabiners and links should be checked to ensure they meet the following requirements:

pp. 3.16, 3.18 - 3.21, 3.22 (undercut), 3.24 - all products;

clause 3.3 - 2% of products from the batch;

GOST 8479-70 - all hook blanks made by free forging and the first and last hook from a batch made by hot stamping;

clause 3.22 (lack of penetration) - 2% of links from the batch;

clause 3.25 (steel hardness) - 1% staples of detachable links and carabiners; triangular, ovoid and oval links; hook blanks from the batch.

For hook blanks, the yield strength and relative elongation of the metal should be checked to the extent indicated in the table. 12.

Table 12

Samples for testing hook blanks produced by free forging must be cut from the allowance for the blanks, and those produced by hot stamping - from the body of the hook blank or from a separately forged sample according to the regime established for stampings from metal of the same heat.

The tensile strength and impact strength of steel should be checked at the request of the consumer.

(Changed edition, Amendment No. 1, 2).

5.4. If unsatisfactory test results are obtained for any of the indicators, double the number of samples taken from the same batch must be re-tested for this indicator.

In case of unsatisfactory results of the re-inspection, the batch is rejected.

Product sizes

The dimensions of domestic omega-shaped brackets are always strictly consistent with the dimensional parameters of cargo slings manufactured in accordance with GOST 25573-82. The regulatory document regulates the thickness of the staples used with slings 2SK and higher, and the distance between the section of the rope branch and the grip

The above is especially important to consider when using the part in conjunction with rope branches that have a transition link. In this case, the main importance is given to the following dimensional values:

• Total length of the part;
• The height of the product to the axis of the fixing element;
• The jaw of the staple, which in turn depends on the dimensions of the mating part of the thimble and the thickness of the rope.

Based on the dimensions considered, a conclusion is drawn regarding whether the practical use of an omega-shaped (anchor) or straight bracket is acceptable. The first is used for multi-arm rigging and in cases where the distance for mounting the fastening bolt is insufficient. The second is taken when the load is not expected to be clamped and with sufficient space for the free arrangement of all elements.

It is also necessary to determine the standard size of the rigging brackets based on the type of material being lifted. As a rule, parts are made from rolled steel St.5 and St.3 in accordance with GOST 380, although in some cases high-quality case-hardened steels, such as steel 20, can be used. However, when lifting objects made of magnetic materials, it is worth using stainless steel brackets, for example 10X17H13M2 or 08X18H10.

Marking and load capacity of chain slings

GOST 25573-82.
cargo rope slings for construction. technical specifications (as amended n 1, 2) Chain slings have a standard design: a chain consisting of several links, two transition links and, optionally, an oval end link, which can be connected to the transition links in a detachable or permanent way. The key classification feature is the number of chains. This parameter distinguishes between:

1. Single-leg slings (marked 1СЦ).
2. Two-leg slings (2SC).
3. Three-legged slings (3SC).
4. Four-legged slings (4SC).
5. Slings in the form of a single chain branch, which can be open (VC) and closed, in the form of a ring (USC-K).

Chain slings of a more complex design are obtained by combining the above types.

Chain slings are also classified according to their load-carrying capacity, which is determined by the strength classes of individual parts of the device. The higher the strength class, the lower the specific material consumption of chain slings, and the higher their durability.

In practice, slings of the following strength classes are used:

• 3rd class – maximum load capacity at temperatures up to 200ºС – no more than 100 kg;
• 5th class – maximum load capacity at temperatures up to 200ºС – no more than 300 kg;
• Class 8 – maximum load capacity at temperatures up to 200ºС – no more than 800 kg;
• Class 10 - maximum load capacity at temperatures up to 200ºС - no more than 1200 kg;
• Class 12 - maximum load capacity at temperatures up to 200ºС - no more than 3150 kg;

Loads are indicated per chain. When the operating temperature increases by more than 200ºС, the permissible loads are reduced by 10...15%.

Within each class, chain slings are also distinguished by the diameter of the chain link. The above standards correspond to products for which the chain diameter has the minimum value required by the standard. For example, a chain sling of strength class 10 with a link diameter of not 4, but 22 mm, has an established load capacity of 22 tons.

There is no GOST for non-mechanized versions of chain slings, so their production is carried out in accordance with the regulatory requirements of RD 11-07-2007. The standard designation of these devices includes their characteristics such as strength class, code name/type, load capacity established for the temperature range -40º...+200ºС and length in mm. For example, the designation 10-4СЦ-17.0-6500 corresponds to a cargo rope sling of strength class 10, four-legged, with a permissible load of 17 tons on each leg, 6500 mm long. The designation may also include additional elements, for example, climate class.

Chain slings can be equipped not only with gripping hooks, but also with end stops, which is noted in the product data sheet.

The strength class of these products is determined by the grade of steel from which the chain links are made. For chain slings of classes 3 and 5, the links are made of steel St. 3 GOST 380, which is convenient for subsequent welding. In other cases, the links are made from cemented structural steels of the type Steel 20 GOST 1050. For particularly difficult operating conditions, the links and connecting elements are made from low-alloy construction steels of type 18G2S or 20GS according to GOST 19281.

This is interesting: Countersinking for metal - purpose and application features - GOST, design, types, application

Criteria for choosing a construction stapler

When choosing a stapler for work, you should pay attention to whether it is safe. Well-known companies that produce such devices carefully think through this issue.

The main protective function is the inability of the stapler to operate at idle speed. This means that the tool will only release fasteners when it is against the part. Before purchasing a tacker, you need to make sure that it has such protection.

The presence of a viewing window is not only pleasant, but also a convenient feature. Even a cheap Chinese model may have it. In the window you can see how many staples are currently in the device.

The device should have a comfortable handle; manufacturers of well-known brands have taken care of this. The instrument is simply pleasant to hold in your hand.

A model in which the impact force can be adjusted is considered practical. Many devices have this capability, including mechanical ones.

Before purchasing replacement brackets, you need to know what type your appliance works with. This information can be found on the device packaging, in the instructions, or on the case itself. As a last resort, you can write down the model name. An experienced seller will be able to determine the type of bracket you need by name.

Materials for fasteners

Since the purpose of the staples will be different, the material used for their manufacture is also different:

• aluminum;
• copper;
• steel;
• galvanized stainless steel.

Fasteners made of aluminum are the cheapest. It is used almost everywhere, as it practically does not rust. But with hard materials, as well as in places where there is a large load, it is better not to use it.

Copper staples are used on non-rigid materials. Although they do not rust at all, their price limits their distribution. They are used in construction, mainly under wallpaper or under plaster, since they do not cause any stains or drips.

Steel fasteners are available in hardened and unhardened types. A hardened product costs a little more, but during use it is much stronger and more reliable. The disadvantage of steel products is that during operation they tend to oxidize and rust.

Stainless steel and galvanized products are the most durable and reliable fasteners. Almost all branded staples from stapler manufacturers are made from this material.

Despite the material from which the fasteners can be made, there are products with regular legs and with sharpened ones. The sharpened ones will penetrate any material more easily, so they require less impact force. When working with a manual staple gun and using sharpened staples, you will have to apply little effort. If you use unsharpened material, then you will need to press hard on the tool so that the bracket fully enters the material and makes the desired clamp. When hammering several hundred, maybe even thousands of staples a day, it’s worth thinking about the shape of the leg to make your work easier.

Application

Currently, rigging shackles are widely used in construction, freight transportation, and manufacturing. They are indispensable in the energy sector, in agriculture, and as fastening elements used in the operation of river ports.

Without rigging shackles, it is impossible to carry out any loading and unloading operations or secure ropes.

Also, the need for rigging shackles arises when you need to securely secure loads on platforms. It is noteworthy that for fastening objects for a sufficiently long period of time, there are special rigging brackets equipped with safety elements.

Classification

According to the shape, material of manufacture, and design of the bracket, there are the following varieties:

• U-shaped and omega-shaped rigging shackles;
• depending on the diameter of the retainer - under a finger or under a pin;
• by the presence of additional fasteners that prevent arbitrary unscrewing of the finger;
• depending on the range of operating temperatures - whether the product loses the strength properties declared in the passport at temperatures below -40 degrees or not;
• depending on the coating of the bracket - allowing or not allowing work to be done in an aggressive environment or at high temperatures.

How are chain slings classified?

GOST 8696-74. Electric-welded steel pipes with a spiral seam for general purpose. technical specifications (as amended n 1-6)

In addition to the number of branches (and often depending on it), slings also differ in the most important parameter responsible for their functionality - load capacity. Conventionally, it can be defined as the sum of the resistance of all individual sling elements to long-term stationary loads. Accordingly, the higher the strength class of the sling, the greater the load it can withstand without the risk of breakage, and the longer it will last.

Classification of slings

The following main strength classes are distinguished:

• Class 3 – maximum load cannot exceed 100 kg;
• 5th class – 300 kg;
• 8th grade – 800 kg;
• 10th class – 1200 kg;
• 12th grade – 3150 kg.

Another parameter of intraclass differences in slings is the diameter of the links. The higher it is, the stronger the chain itself will be. The above values ​​are standard, relevant for slings with a minimum link diameter; as it increases, the load-carrying capacity of the sling can increase to a value 1.5-2 times higher than that determined by the strength class.

We recommend to buy

Shackles

Download price list

https://www.youtube.com/watch?v=52g8m6_4YAE

Lifting shackles for securing cargo are omega-shaped elements used for fastening cables and chains for their installation to various structures. Fastening loops are used to create guy wires and move loads of various types. Features: the brackets for securing the load can be quickly removed and ensure secure fastening.

Similar in scope of application, a straight rigging shackle with a screw pin is used for handling cargo and creating temporary ties, while for long-term, permanent connections a shackle or fastening loop for a load with a nut and safety pin is required. In addition, if during production operations the finger experiences forced rotational movements, then it is recommended to use cotter pins to secure the load.

Depending on what kind of cargo securing loop you need, you will certainly find the necessary products in the catalog.

Straight type staples

Screw rigging shackle SA type G-210 G/p, tWeight, kgPrice, rub.

Lifting shackle cotter pin SA type G-2150 G/p, tWeight, kgPrice, rub.

Omega type staples

Screw rigging shackle SI type G-209 G/p, tWeight, kgPrice, rub.

Lifting shackle cotter pin SI type G-2130 G/p, tWeight, kgPrice, rub.

Types of chain slings

The classification of the product in question can be carried out according to a variety of criteria. An example is the list below:

1. Load capacity, which varies from 1 to 67 tons.
2. The length of the product can vary from 0.5 to 20 meters. However, some versions can be made to order and have other properties.
3. The type of grip used for the load. The ring chain sling is characterized by the fact that both ends are fixed on a special connecting link.

The fairly widespread use of single-leg chain slings can be associated with the fact that the product is characterized by low weight and sufficient strength for transporting various mechanisms. Double-leg lifting slings are also quite common. On production lines you can find several design options, which are selected depending on the characteristics of a particular transportation case. There are also universal products that are widely used.

Rigging shackle - standards, types, sizes, application features and installation rules (100 photos)

A rigging shackle or omega shackle is a device used when working with static and lifting mechanisms. Such a fastening structure plays the role of a removable ligament for attaching various metal ropes and chains. Its main advantage lies in the simplicity of the device. The price of rigging shackles depends on their type.

Types of staples

As can be seen in the photo of the rigging brackets, they can be of the following types:

• Polar. Such products can be used in temperatures as low as -40°C.
• Regular. Such fasteners are designed to work under normal temperature conditions.

Depending on the type of protective coating, fasteners are divided into those that allow you to work with hot workpieces, and those that can be used in a chemically active environment.

The staples are distinguished by their appearance:

• Omega-shaped. The omega shackle gets its name from its curved Latin omega shape.
• Direct. Straight shackles have a U-shape.

It is also worth noting that the staples can be equipped with additional clamps. Most often, a bolt with a castle nut performs this function, ensuring reliable fastening.

There are also rigging brackets:

• With safety locking bolt. Used for permanent tasks.
• With screw pin. Used to solve temporary problems.

In addition, there is a classification based on the size of the rigging brackets. When choosing a product, you should consider the following factors:

• thickness of fixed parts;
• dynamic load factor;
• planned cargo size.

Fastening elements can, in addition, have different load-carrying capacities. This parameter can vary from 0.33 t to 150 t. Its value is influenced by the characteristics of the heat treatment of the product, its dimensions and the chemical composition of the alloy used.

They control the production of staples GOST 2224-72 and GOST 2224-93.

Geometric parameters of rigging brackets

The dimensions of fasteners are regulated by the provisions of GOST 25573-82. This standard regulates the thickness of products used in conjunction with slings from 2 SK, as well as the distance between the grip and the section of the rope branch.

The most important role is played by such parameters as the length of the element, its height to the axis of the clamp, and the fastening mouth. After their detailed consideration, a conclusion is made about the admissibility of using this or that type of bracket in practice.

If the rigging is multi-armed or the distance for installing the securing bolt is not enough, then the best solution would be an omega-shaped fastener. In other cases, preference is usually given to direct models.

You also need to select the standard size, taking into account the type of material being lifted. Speaking about the metal used for the production of rigging fasteners, rolled steel is most often used, less often cemented steel. You can also find stainless steel products on the construction market.

Subtleties of choosing a size

You need to choose a standard bracket size based on the following things:

• operating conditions of the product;
• element size in plan;
• maximum load capacity.

The method of stamping is of utmost importance. The strength of the bracket depends on it.

Any corrosive damage to the fastening surface is not acceptable. It is optimal if the fasteners are painted and galvanized.

Recommendations for use

Before purchasing such products, you need to carefully check:

• correspondence between the body and the pin (all parameters are taken into account);
• no damage to the threaded part;
• the presence of an adjustable cotter pin;
• no signs of wear or deformation;
• quality of the fastening surface.

You also need to make sure that the staples are not exposed to thermal effects - this negatively affects the maximum load capacity. In addition, it must be remembered that it is prohibited to change the shape of fasteners using welding, bending or heating.

A rigging shackle is a necessary thing. It will be useful in any household. Especially if you often do construction work.

Choosing this product requires a responsible approach. You should buy staples only from trusted manufacturers. A well-known brand will serve as a kind of guarantee of quality. Advice from experienced specialists will also be useful.

Manufacturing

The rigging shackle is made primarily from carbon steel, i.e., tool or unalloyed structural steel, to which alloying elements can be added to impart increased strength characteristics to the shackle. Such staples are coated with an anti-corrosion protective coating during the galvanizing process. As a result of manufacturing and galvanization, the staples are extremely resistant to high loads, moisture, and extreme temperatures. The brackets are designed for loads from 300 kg to 100-160 tons. Rigging shackles have markings indicating quality and safety characteristics; accordingly, they must be used of a strictly defined type, intended to solve a particular task.

Rigging shackle: GOST standards and dimensions

The production of rigging shackles is carried out in strict accordance with the main standards accepted in this industry: - GOST 2224 - DIN 82016 and DIN 82101 - Technical specifications OST 5.2312-79 - European Union standard EN 13889. Lifting shackles from foreign manufacturers correspond to brackets according to OST 5.2312-79, they have almost the same gradation of load capacity, but significantly smaller in size. The size range of rigging brackets has a fairly wide range. The characteristics of the bracket include the type, maximum load, main dimensions of the product and its weight.

Comparison

Basket

What is a rigging shackle? Size standards, modern types, rules and features of choice

Lifting shackles are used when lifting and moving various loads. The main task of the device is reliable coupling of the elements of the lifting mechanism. Due to the fact that during operation the products are subject to serious physical stress, their production is regulated by domestic GOSTs and foreign technical standards.

The types of rigging shackles, with photos and illustrations, their purpose, manufacturing methods and design will be discussed in the article.

Classification

According to the shape, material of manufacture, and design of the bracket, there are the following varieties:

• U-shaped and omega-shaped rigging shackles;
• depending on the diameter of the retainer - under a finger or under a pin;
• by the presence of additional fasteners that prevent arbitrary unscrewing of the finger;
• depending on the range of operating temperatures - whether the product loses the strength properties declared in the passport at temperatures below -40 degrees or not;
• depending on the coating of the bracket - allowing or not allowing work to be done in an aggressive environment or at high temperatures.

The maximum permissible load on the bracket is determined both by its geometric shape and the material from which it is made, and its subsequent heat treatment.

Current GOST and its requirements

The choice of a particular bracket is determined by the static and dynamic loads it experiences during operation, the dimensions of the fastening elements and the conditions under which it will be used. Data about the product can be found from its passport, as well as by reading GOST 2224-93.

GOST standards stipulate the following product parameters:

• steel grades suitable for the manufacture of rigging shackles;
• technological processes used for manufacturing - forging, hot or cold bending;
• requirements for the working surface;
• possible places for marking the product and the content of the marking;
• information on the methodology for quality control of manufactured products;
• description of the process of preservation and re-preservation.

How to choose the size of the staple

The bracket is selected in accordance with the dimensions of the cargo slings, regulated by the requirements of GOST 25573-82. This applies in particular to the thickness of the clamp and pin, the distance between the grip and the free section of the cable.

The most significant parameters are:

• the opening of the rigging shackle is proportional to the thickness of the cable used;
• length of the inner part;
• total length;
• thickness of staple and finger.

Depending on the parameters of the cable, as well as the expected mechanical load, either a straight or omega-shaped rigging shackle is selected. A straight bracket is used if there is enough working space for the fastening elements, and there are no cases of clamping the load.

An omega or anchor shackle is used when there is no room for a finger, or when using multi-arm rigging devices.

The required dimensions of the bracket can be determined by its number, which corresponds to the maximum permissible load on it. In addition, different materials from which staples are made have different permissible loads for the same geometric dimensions and shapes of the product.

Selecting the standard size of rigging brackets

The main condition for choosing one or another bracket is that the force exerted on it during operation should be five times less than the maximum permissible for this type of product.

If there are signs of corrosion on the surface of the bracket, it is considered unsuitable for further use. For this reason, galvanized products are the most popular, or in the worst case, products painted with anti-corrosion paint. The cost of galvanized products is higher than that of painted or untreated ones.

Depending on the production method, strength also differs - staples made by cold bending have significantly less strength compared to those produced by hot bending and subsequent heat treatment. This property is due to the strong bending stress of the first type of staples.

For the same shackle and pin thickness, anchor shackles can withstand 2.5 times more load than straight shackles. There are special tables showing the relationship between the diameter of the bracket and the maximum load allowed for it.

Types of chain slings

GOST 25930-83. plastic covers for cylindrical connectors. technical specifications (with changes n 1, 2)

All slings of this type have a similar design - a working chain consisting of a certain number of standard links, two transition links (for attaching the working hook and the sling itself) and one end, which is larger in size and intended for connection with transition links. Connections can be either detachable or permanent; to implement the former, carabiner designs are often used.

The main feature by which chain slings differ from each other is the number of chains (they are also called branches). Accordingly, products with the largest number of branches are used to lift the most complex (due to a shifted center of gravity or uneven location of slinging points) loads. According to this parameter, the following types of slings are distinguished:

• single-branch (1SC);
• two-branch (2SC);
• three-branch (3SC);
• four-branch (4SC);
• universal, including one branch, which can be either closed (USC-K) or open (VC).

It is also possible to produce more complex structures that combine several of the above types. Usually they are made to order according to a special technical project, which is drawn up taking into account the expected loads and the specifics of lifting operations.