Types of Shackles for Marine Land Lifting
If you're planning to use a shackle for marine land lifting applications, you need to choose a type that meets your specific needs. There are several types of shackles, including screw pin, chain, spring-activated, and stainless steel. In this article, we'll go over the different types of shackles and what they're used for.
Screw pin shackles
There are three main types of shackles for marine land lifting: bolt, chain and anchor shackles. Screw pin shackles have a threaded pin and are not recommended for permanent use. They are suitable for multi-leg sling assemblies but side-loading must be considered. To ensure the correct shackle size, check the pin diameter and threaded bore before installation.
The US Type Forged Screw Pin Anchor Shackle is available in capacities ranging from 1/3 to 85 tons. This shackle is designed with drop-forged alloy pins and a permanently displayed working load limit. Its rated load is 2.2 times higher than the working load. In addition, US Type Forged Screw Pin Anchor Shackles have self-coloring and can be marked according to customer specifications.
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The most common type of chain used in marine land lifting is the American-Made CM Super Strong Shackle. These shackles are made from marine-grade stainless steel and are resistant to rusting caused by the high salt content in the seawater. The shackles are available in different types depending on their application. Heavy-duty shackles are suitable for securing many ropes from multiple angles, while bow shackles are used for securing several ropes in one go.
A shackle with a spring-activated mechanism can be used in a wide variety of marine land lifting applications. It should be designed for a range of loads, including axial, torsional, and twisting forces. Unlike the traditional type of shackle, which requires a pin to be installed, a spring-activated shackle can be installed on a vessel without the use of a mechanical or electrical power source.
Snap shackles are used for many different rigging and lifting applications. They are useful for heavy-duty lifting applications, and can even be used for personal rigging. They can be used in many situations, such as attaching spinnakersheets and leashes. However, these shackles aren't as secure as the other shackles available. Snap shackles are best for high-speed lifting jobs, because they can be used with only one hand.
Stainless steel shackles
There are two types of shackles for marine land lifting: screw pin and safety pin shackles. Screw pin shackles are commonly used by lifting firms and are ideal for temporary applications. These shackles should be checked for tightness and integrity before each lift. Wire mousing may be used to prevent the safety pin from coming unscrewed. Safety pin shackles are usually preferred for jobs that are prone to significant vibration.
Stainless steel shackles are available in many different styles and sizes and many types are custom made for specific applications. They are made of Type 316 stainless steel, which is great for marine and wet environments. Type 304 stainless steel contains 18% chromium, which makes it highly corrosion resistant and offers great durability. These shackles can be used on a variety of marine applications.