Qingdao Haosail Machinery Co., Ltd.

Master link assemblies are a critical component in multi-leg chain slings, serving as the primary connection point between the sling legs and the lifting device. Correct selection and configuration of master link assemblies directly affect load distribution, lifting safety, and overall sling performance.

This article explains the function of master link assemblies, common types used in multi-leg chain slings, and how to select the right assembly for different lifting applications.

What Is a Master Link Assembly?

A master link assembly is a complete connection system that typically includes:

One main master link (connected to the crane hook or shackle)

Multiple intermediate sub-links for attaching individual chain legs

In 2-leg, 3-leg, or 4-leg chain slings, the master link assembly gathers all sling legs into a single lifting point, ensuring controlled and balanced load transfer during lifting operations.

Role of Master Link Assemblies in Multi-Leg Chain Slings

1. Load Distribution

Master link assemblies are designed to distribute loads evenly among all chain legs. Proper configuration helps prevent uneven stress, overloading of individual legs, and premature wear.

2. Connection Compatibility

The master link must match the crane hook or shackle in size and shape to ensure:

Proper seating

No side loading

Smooth load transfer

US-type and European-type master link designs address different hook and rigging practices.

3. Angle-Dependent Lifting Capacity

In multi-leg slings, the Working Load Limit (WLL) is influenced by the lifting angle. Most master link assemblies are rated for use within a 0°–45° lifting angle, reflecting real lifting conditions and ensuring safety during angled lifts.

In multi-leg chain slings, different master link assemblies are used depending on sling configuration, lifting practice, and regional standards. A345, A346, and A347 master link assemblies are among the most commonly used designs, each serving a specific purpose.

The A345 US Type Master Link Assembly consists of a main oblong master link combined with two intermediate sub-links, and is typically used for 2-leg chain sling assemblies. Its US-type design allows smooth load transfer and good compatibility with crane hooks and shackles commonly used in North America.

The A346 Master Link Assembly is a standard master link assembly design that is not classified as US Type. It features a master link combined with three intermediate sub-links, enabling connection for 3-leg and certain 4-leg chain sling assemblies.

The A347 US Type Master Link Assembly is designed with a main master link and four intermediate sub-links, making it suitable for 4-leg chain sling assemblies. The US-type structure provides stability and reliable performance in heavy-duty lifting operations.

About us:

As a professional manufacturer and supplier of lifting and rigging hardware, Qingdao Haosail Machinery Co., Ltd. supplies a complete range of master links and master link assemblies, including A342, A343, A345, A346, and A347.

All products are manufactured from high-quality alloy steel using controlled forging and welding processes. Our master link assemblies are widely used in construction, industrial lifting, offshore operations, and heavy-duty material handling. OEM and customized solutions are available to meet different sling configurations and project requirements.

Conclusion

Master link assemblies are the core of any multi-leg chain sling system. Understanding the differences between master link types and assemblies—such as A342, A343, A345, A346, and A347—helps ensure proper load distribution, safer lifting operations, and reliable long-term performance.

Choosing the right master link assembly is not only a matter of capacity, but also of compatibility, lifting angle, and application environment.