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High Strength Shackles: the 5 Key Attributes

High Strength Shackles: the 5 Key Attributes

Table of Contents

Choosing the right high-strength shackle for critical and intensive lifting and rigging operations is essential. All shackles are in good condition on use, but their durability over time is the accurate measure of responsibility. Typical weaknesses of all types of rigging shackles can be found in the body, cotter pin, or pinholes, which can cause severe damage resulting in a disastrous end.

When choosing a high-strength shackle, there are 5 key factors to take into account: 1) Material Composition; 2) Dimensions; 3) Surface Finishing; 4) Breaking Strength & W.L.L; 5) Quality Control Inspections. Consider these carefully to make the right decision and ensure your chosen product meets your needs.

Material Composition

High-strength shackles are based on loading capacity, performance, and environmental applications. First, the raw materials determine these factors and select the different materials for your applications. High tensile carbon steel and alloy steel shackles can be used in highly loading limited, fatigues, or extreme conditions. Stainless steel shackles are ideal for yacht rigging, decking, and architectural applications.

Read this article for more about rigging accessories materials: 《Top 3 Steel Materials for Rigging Professionals》.



When choosing shackles, it is vital to check the size specifications of the shackle. Factors such as the size and shape of the lifting load, working environment, and types of equipment being used must all be considered when selecting a suitable shackle. Be sure to consult any relevant safety regulations and load ratings before installation.

Read more: 《Shackle Sizes & Materials: What You Need to Know》.

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Surface Finishing

Rigging shackles are equipped with an exceptional surface finish that serves to protect the shackle from friction, wear, and corrosion. This protection is provided by a galvanized layer of zinc on the shackle’s surface, providing superior durability and performance in rigging applications.

Read this article for more about rigging accessories surface finishing: 《The 3 Different Types of Surface Treatments》.


Breaking Strength & W.L.L

Working Load Limited (W.L.L.), also known as Safe Working Load (S.W.L.), is the maximum force a rigging hardware can manage, without risk of breakage, to lift, suspend or lower an object. Such a limit is generally stated on the device itself by the manufacturer. To guarantee an extra security layer, it is highly advised to use accessories with a high safety factor: Minimum Breaking Strength (M.B.S.) divided by a safety factor (S.F. = MBL / WLL). 

Bolt Chain Shackles

Quality Control Inspections

Quality control inspections of shackles are necessary to ensure product safety and accuracy. These inspections must be done both during the manufacturing process and after the product has been completed. During the examination, components such as dimensional accuracy, material composition, strength, and finish quality will be checked to ensure they meet industry standards. Only materials that pass these rigorous tests will be used in an assembled shackle.



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