Qingdao Haosail Machinery Co., Ltd.

In lifting and rigging operations, selecting the correct lifting shackle is one of the most important factors for safe and efficient load handling. A lifting shackle is widely used to connect wire rope slings, chain slings, webbing slings, and lifting equipment in construction, marine, offshore, and industrial lifting applications.

Using the wrong shackle for lifting can lead to reduced load capacity, equipment damage, or serious safety risks. This guide explains how to choose the right shackle for lifting applications, focusing on shackle types, pin designs, materials, working load limits, and inspection practices.

Different Types of Lifting Shackles:

The first step in choosing a lifting shackle is understanding the main shackle types used in lifting operations.

Bow Shackle for Lifting

A bow lifting shackle, also known as an anchor shackle, features a wide, rounded body. This design allows the lifting shackle to accommodate multi-directional loads and multiple sling connections.

Bow shackles for lifting are commonly used in heavy lifting, multi-leg sling assemblies, and general rigging applications where load angles may change during the lift. Because the wider body distributes load more evenly, bow lifting shackles help reduce stress on slings and connected hardware.

Dee Shackle for Lifting

A dee lifting shackle, also called a D shackle, has straight sides that keep the load aligned in a straight line. This type of lifting shackle is designed for in-line loading and should not be subjected to significant side loading.

Dee shackles for lifting are ideal for single-leg slings, vertical lifts, and permanent or semi-permanent lifting connections where load direction remains stable.

Choosing the Right Pin Type for a Lifting Shackle

The pin design plays a critical role in the safety of any lifting shackle.

Screw Pin Lifting Shackles

A screw pin lifting shackle is easy to install and remove, making it one of the most commonly used shackles for lifting. It is well suited for temporary lifting operations and applications where rigging needs to be adjusted frequently.

However, screw pin shackles for lifting should not be used in environments with constant vibration or rotation unless additional securing measures are taken.

Bolt Type Lifting Shackles

A bolt type lifting shackle, secured with a nut and cotter pin, provides a more reliable connection. This type of shackle for lifting prevents accidental pin rotation and is preferred for long-term or critical lifting operations.

Bolt type lifting shackles are widely used in offshore lifting, structural lifting, and applications involving movement or vibration.

Working Load Limit of a Lifting Shackle

The Working Load Limit (WLL) defines the maximum load a lifting shackle can safely handle under normal lifting conditions. Exceeding the WLL of a shackle for lifting can cause deformation or sudden failure.

When selecting a lifting shackle, always consider dynamic loads, shock loading, and load angles. Side loading significantly reduces the rated capacity of any lifting shackle. Certified lifting shackles are permanently marked with size, WLL, manufacturer identification, and applicable standards.

Material Selection for Lifting Shackles

Material choice has a direct impact on the performance and service life of a lifting shackle.

Carbon steel lifting shackles are commonly used in general lifting operations due to their high strength and cost efficiency. These shackles for lifting are usually hot-dip galvanized to improve corrosion resistance.

Alloy steel lifting shackles offer a higher strength-to-weight ratio and are suitable for heavy-duty and critical lifting applications. They are often used in construction, industrial lifting, and infrastructure projects.

Stainless steel lifting shackles provide excellent resistance to corrosion and are ideal for marine, offshore, and chemical environments. Although stainless steel shackles for lifting typically have a lower WLL than alloy steel shackles, they are preferred where corrosion resistance is essential.

Selecting a Lifting Shackle Based on the Working Environment

Environmental conditions should always be considered when choosing a lifting shackle. Marine and offshore environments require shackles for lifting that can withstand saltwater corrosion. High-humidity or outdoor applications benefit from galvanized lifting shackles. Chemical exposure often requires stainless steel lifting shackles to ensure long-term reliability.

Matching the lifting shackle material to the working environment helps extend service life and maintain lifting safety.

Inspection and Safe Use of Lifting Shackles

Every lifting shackle should be inspected before use. Regular inspection helps identify potential issues before they lead to failure.

Check the lifting shackle for cracks, deformation, excessive wear, corrosion, and damaged or bent pins. Threads should be clean and fully engaged. Never use a lifting shackle that has been repaired, modified, or previously overloaded.

Proper inspection and maintenance are essential parts of safe lifting operations.

Conclusion

Choosing the right lifting shackle for lifting applications is essential for safe and efficient rigging operations. By understanding different lifting shackle types, pin designs, materials, working load limits, and environmental factors, lifting risks can be significantly reduced.

As a professional lifting shackle and rigging hardware supplier, we offer a full range of certified lifting shackles designed for demanding lifting applications worldwide. Contact us to select the right shackle for your lifting needs with confidence.