Qingdao Haosail Machinery Co., Ltd.

In crane operations, wire rope slings are critical components connecting the lifting equipment to the load.  The proper selection of these slings directly impacts operational safety, efficiency, and equipment lifespan. As a professional rigging hardware supplier, we will systematically explain the selection process from several key dimensions, drawing on our industry experience.

I. Clarifying Lifting Conditions and Operational Requirements

Before selecting wire rope slings, it is essential to fully understand the actual operating conditions; this is the foundation for all selection decisions.

1. Working Load Limit (WLL)

Determine the maximum lifting weight, including the weight of the load itself, the weight of the lifting gear, and any possible additional loads.

The rated working load of the wire rope sling must be greater than the actual lifting weight, with a sufficient safety factor.

2. Lifting Method

Different lifting methods significantly affect the stress on the wire rope slings:

Single-leg vertical lifting

Two-leg, three-leg, or four-leg combined lifting

Basket hitch

Choker hitch

Note: When using multi-leg slings or non-vertical lifting, the actual stress on each wire rope will change and must be calculated accordingly.

3. Operating Environment

Indoor or outdoor

Presence of high temperatures, corrosion, humidity, or chemical agents

Long-term exposure to wind, rain, or marine environments

II. Selecting the Appropriate Wire Rope Structure

The structure of the wire rope directly affects its flexibility, wear resistance, and service life.

1. Common Wire Rope Structures

6×19, 6×36: General-purpose structure, good wear resistance, suitable for most lifting operations

Multi-strand fine wire structure: Better flexibility, suitable for conditions with many pulleys and frequent bending

2. Lay Direction Selection

Right regular lay (common)

Left regular lay

Usually, lifting slings use a regular lay structure for better stability and to prevent rotation. III. Wire Rope Diameter and Safety Factor

1. Wire Rope Diameter Selection

The larger the diameter, the stronger the load-bearing capacity.

The selection should consider the crane hook size, pulley diameter, and compatibility with rigging connectors.

2. Safety Factor

Wire rope slings for lifting operations typically use a higher safety factor:

General lifting operations: 5:1 or 6:1

High-risk or critical lifting: ≥ 6:1

Choosing products that comply with international standards (such as EN, ASME, ISO) is particularly important.

IV. Selection of Rigging End Forms

The end structure of the wire rope sling determines its connection method and ease of use.

Common end forms include:

Pressed wire rope loop (Flemish Eye)

Spliced rope loop (Hand Spliced Eye)

Combination with shackles, lifting rings, or hooks

Recommendations:

For frequent loading and unloading operations, choose finished slings with lifting rings or shackles.

For heavy-duty and long-term use, prioritize pressed rope loops for more stable strength.

V. Compliance with Standards and Quality Certification

High-quality wire rope slings should have clear quality markings and traceability:

Clear WLL (Working Load Limit) marking

Product label or steel plate

Materials and manufacturing processes comply with international standards

As a rigging supplier, we recommend that customers prioritize:

Factories managed under ISO quality systems

Products that provide material certificates and test reports

VI. Usage and Maintenance Recommendations

Even with correct selection, improper use and lack of maintenance will significantly shorten the service life of wire rope slings.

Precautions for Use

Avoid overloading and impact loads.

Do not allow the wire rope to come into direct contact with sharp edges.

Check the wire rope for kinks and deformation before lifting.

Regular Inspection

Check for broken wires, wear, and corrosion.

Check if the rope loops are loose or deformed.

When the wire rope reaches the scrapping standard, it should be immediately taken out of service.

VII. The Importance of Choosing a Professional Rigging Supplier

The right wire rope sling is not just about the product itself, but also about professional technical support. A professional rigging supplier can provide you with:

Selection recommendations tailored to specific working conditions

Customized wire rope rigging solutions

Stable product quality and guaranteed delivery times

In crane operations, choosing wire rope rigging is not simply a matter of "the thicker the better." Instead, it requires considering **load, working conditions, structure, safety factor, and operating environment.**  Scientific selection not only improves operational efficiency but is also crucial for ensuring the safety of personnel and equipment.

If you are looking for suitable wire rope rigging for your lifting operations, please contact us. As an experienced rigging supplier, we will provide you with professional and reliable solutions.