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The lifting shackle, as a classic fastening tool, plays a crucial role in industries such as manufacturing, shipping, construction, and even sports. Its primary function is to provide a secure and reliable connection point for lifting, pulling, or securing heavy loads.

Main types and structures
The lifting rings are mainly divided into two categories:
·Standard lifting ring: usually an integrated forged structure consisting of a ring body and a threaded rod. Simple structure, low cost, suitable for vertical force direction.
·Rotating lifting ring: This is a more advanced and powerful design. Its core feature is that the ring can rotate 360 degrees, and the connection between the rod and the base can tilt at a certain angle (usually 180 ° or more).
·Working principle: The combination of precision machined shaft pins, bearings, and washers allows the ring to rotate and tilt freely, allowing loads to come from multiple directions without causing torque to the threads.
·Advantages: It can automatically align the load direction, eliminate lateral force damage to the thread, greatly improving safety and service life.   

Professional knowledge should ultimately be applied to safe operations:
·Correct installation:
1. Ensure that the threaded hole is clean and free of foreign objects.
2. It must be screwed in to a sufficient depth. Usually, it is required to screw into the threaded rod and tightly adhere to the installation surface, that is, "shoulder surface contact". For deep holes, the screwing depth should be at least equal to the diameter of the thread.
3. Use appropriate tools (such as torque wrenches) to tighten to the recommended torque value to prevent failure due to looseness.
·Load direction:
·The standard lifting ring is only subjected to vertical force.
·Although the rotating lifting ring can withstand multi-directional loads, it still needs to ensure that the load is within its designed working angle range.
·Regular inspection and scrapping: A regular inspection system must be established, and any of the following situations should be scrapped immediately:
·Visible cracks, deep dents, or incisions appear.
·Permanent deformation (such as straightening or bending of the ring).
·The threaded part has severe wear, corrosion, or damage.
·The rotating lifting ring does not rotate or tilt flexibly, and there is a sense of jamming.

    The use of lifting rings is extremely extensive, covering almost all areas that require lifting and fixing

Industrial manufacturing and equipment installation
This is the core application area of the suspension ring.
·Mechanical equipment: As a lifting point for large machine tools, injection molding machines, and generator sets, it is convenient for transportation, installation, and maintenance.
·Mold industry: Used for lifting and mold changing operations of heavy-duty molds, rotating lifting rings are particularly commonly used to facilitate mold alignment.
·Aerospace: used for maintenance and hoisting of aircraft components and engines.

Construction Engineering and Logistics Transportation
·Prefabricated components: At construction sites, lifting rings are embedded in cement prefabricated slabs, beams, and columns for the lifting and positioning of components.
·Container transportation: Standard corner fittings are installed on all eight corners of the container, which function similarly to giant lifting rings and are used for lifting, stacking, and securing the container.
·Cargo binding: On the deck of a truck or ship, the lifting ring serves as a fixed point, which is used in conjunction with straps and chains to secure the cargo.

Ocean Engineering and Shipbuilding
·Marine equipment: used to fix equipment on the deck or as a lifting point for lifeboats and workboats.
·Underwater operations: ROVs (remotely operated vehicles), underwater structures, etc. all require the use of high specification, corrosion-resistant lifting rings.

The lifting ring, from a simple connecting ring to a precise rotating mechanism, is a deep combination of materials science, mechanical design, and safety engineering. Whether it is lifting giant equipment weighing hundreds of tons or serving as a fulcrum for gymnasts to showcase their strength and beauty, its core value always lies in reliability.
The correct selection, standardized installation, and regular inspection are the only criteria to ensure that this small component can safely bear the heavy burden.