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Use, Maintenance, and Management of Shackles

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News

Time：

2025-05-26

Shackles play a crucial role in everyday operations and are widely used across industries such as power, metallurgy, petroleum, machinery, railways, chemicals, ports, mining, and construction.

I. Types of Shackle

Based on the shape of the shackle body, shackles are primarily classified into D‑shaped shackles and bow‑shaped shackles. A D‑shaped shackle has a semicircular top, with an inner radius equal to half the inner width between its two eyelets; it is also referred to as a U‑shaped or straight shackle. A bow‑shaped shackle features a top that is roughly semicircular, with an inner radius greater than half the inner width between its two eyelets; it is also known as an Ω‑shaped or horseshoe‑shaped shackle.

In China, shackles are broadly classified into five types: G209 (BW), G210 (DW), G2130 (BX), G2150 (DX), and G2160 (KWB). These different shackles exhibit slight variations in their connection designs.

So how can you identify a qualified shackle? First, the shackle should have a smooth, even surface, with no cracks, sharp edges, or signs of overheating. Furthermore, drilling or welding repairs are not permitted. If the shackle or its pin undergoes permanent deformation or develops cracks, or if the body and pin are permanently deformed, it must not be repaired again.

II. Methods of Use and Safety Inspections for Shackles

Before using a shackle, carefully inspect the body and pin for severe wear, deformation, or fatigue cracks. During use, the shackle’s lateral clearance must not be subjected to tensile forces, and the pin must be securely fitted with a safety pin to ensure absolute safety.

The following examples demonstrate proper and improper lifting procedures, respectively:

Of course, once the pivot pin is properly installed, the inner width of the housing must not be noticeably reduced, and the threaded connection must also be securely fastened. Furthermore, always ensure that the specified safe working load is never exceeded during use.

If obvious permanent deformation is observed, or if the pin cannot rotate freely, or if the cross-sectional wear at either the shackle or the pin exceeds 10% of the original dimension, or if any part of the shackle exhibits cracking, the shackle must be replaced.

Special attention!
Overloading is the most damaging factor for shackles; it not only shortens their service life but also poses an immeasurable threat to life and property. Never use a shackle beyond its rated capacity or in an improper manner.

III. Maintenance of Shackles

With regard to shackle maintenance, newly acquired shackles must be inspected by designated personnel prior to use, in accordance with the relevant provisions of the applicable manual, to determine their suitability for service. The user organization or responsible personnel shall maintain a register and implement numbered management for all shackles placed into service.

When using shackles, whether before use, during operation, or during periods of inactivity, it is essential to develop the habit of visual inspection. If any defects that could compromise safe performance are detected, consult the relevant technical personnel, conduct a safety assessment, maintain thorough records, and determine whether the shackle can continue to be used.

During inspection, verify that shackle markings have not been lost, damaged, or obscured by contamination to the point where their contents are illegible. Confirm that the product’s certification is still valid. Check whether hardware components such as the shackle pin are loose, and inspect the metal structure’s primary load‑bearing members for signs of wear, corrosion, cracks (including welds), plastic deformation, or other abnormalities. If any of these conditions are detected, shanks that have been deemed scrap or non‑conforming by qualified technical personnel must be segregated in a designated area, with proper centralized collection and disposal.

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