Links

Connecting links are metal components for lifting equipment, used as a primary or auxiliary element. There are more than 10 types of connecting structures with different connection types.

A connecting link provides contact between:

1. Parts of a chain comprising an odd number of links joined into a ring.
2. A pair of internal links.

An additional purpose is replacing damaged or removed outer links. Links undergo full mechanical and heat treatment to increase strength and performance characteristics. According to GOST, links of various sizes may be used in horizontal or vertical position.

Types of links

There are more than 10 types of connecting links. Common types:

1. Butterfly link (SLR-074). Used for connecting chain slings to each other.
2. SLR-001. Used for joining textile slings. Has a flat surface on the lower eye, into which the textile webbing is threaded.
3. SLR-002. Used on the end elements of a chain.
4. SLR-270. Used as the end element in the manufacture of slings from high-strength chains.
5. Swivel link (SLR-283). Used for suspending a load with possible twisting of the wire rope or cable. Produced with or without a bearing.
6. Transition link SLR-356. Used for connecting chains of different sizes.
7. Oval links. Used as parts of a chain or at the ends of slings for securing rigging elements, anchor chain.
8. Master link. Used as a connecting element for legs of 2 or more slings.
9. Weld-on element. Used for attachment to a metal surface for subsequent securing of a load or goods.
10. Triangular links. Used as parts of a load-bearing wire rope sling for securing rigging.

Operation

Connecting links are used as an element that allows chains to be extended or formed into rings. There are variants that provide a branching of 3 or more slings for securing loads and goods. Spring clips or special cotter pins simplify removal or replacement of the element.

Marking

Regulatory documents specify that connecting links are marked with an alphanumeric designation:

1. C – the name of the element – connecting link.
2. Type of chain for which the connecting link may be used, e.g., anchor chain.
3. Chain pitch in millimeters.
4. The last numerical designation — the load the element can withstand, in kilonewtons.

How to choose?

Connecting links are selected in accordance with GOST and other regulatory documents, taking into account the maximum load on rigging elements. Depending on the element’s spatial position, a strength safety margin must also be taken into account.

Links are made from high-strength alloy steel grades and coated with anti-corrosion coatings, ensuring long service life in aggressive environments.