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A Comprehensive Guide to the Different Types of Shackles

A Comprehensive Guide to the Different Types of Shackles

Table of Contents

What’s a shackle?

A shackle is an essential piece of equipment used in rigging, lifting, pulling, and hoisting. It is a u- or jaw-shaped connecting link with a removable pin designed to join lifting slings, wire ropes, chains, and ropes together for different applications. They are perfect for temporary lifting jobs that require quick connection and disconnection.

What are the 4 parts of shackles?

The four main parts of a shackle are the Bow, Pin, Ear, and Shoulder.

4 parts of shackles

How many types of shackles?

  1. Sort by shape: D Shackles & Chain Shackle, Bow Shackles & Anchor Shackles.
  2. Sort by Pin: Screw Pin Shackles, Bolt Shackles, Round Pin Shackles.

Chain Shackle Vs Anchor Shackle

D Shackles & Chain Shackle

D shackles are also called Chain shackles. D shackles are the most common in larger industrial and marine applications. They have a U-shaped loop with a pin at one end, which can easily accommodate strong loading forces and flexibility in movement. Chain shackles, or eyelet shackles, feature an oval link wider than an ordinary chain link. This wider gap allows easier access to insert and remove items from the shackle.

Bow Shackles & Anchor Shackles

Bow shackles are the most commonly used in rigging due to their wide range of sizes and capacities. They feature two parallel end plates with a pin in the center, which allows them to be attached securely to other items while providing more strength than eye shackles. Anchor shackles, on the other hand, typically have larger bows (ie. thicker walls) and boast a greater load rating than bow and eye shackles. The “O” shape provides superior strength for heavier loads. It makes them a more significant force-bearing area and longer service life.

Screw Pin Shackles Vs Bolt Shackles Vs Round Pin Shackles

Screw Pin Shackles

Screw pin shackles are similar in design to anchor shackles. Still, they feature a threaded pin engaged with a nut to prevent it from slipping out when the shackle is loaded. Unlike typical pins, these offer the security of screw-type fasteners and eliminate any possibility of unexpected pin movement. These are typically used for heavier lifting applications and creating secure connections between chains, slings, and other rigging components.

Bolt Shackles

Bolt Shackles
Bolt Shackles

Bolt shackles are very similar to screw pin shackles. Still, instead of a threaded pin, they have an oversized bolt with a drilled hole for a temporary locking mechanism. This type of shackle is popular in the industry for its high load capacity and versatile use in multiple rigging and lifting applications. It is commonly used in harsh environments where breakage or fatigue is likely to occur. The bolt design provides extra security by allowing for a secure and easy connection between objects.

Round Pin Shackles

Round Pin Shackles
Round Pin Shackles

Round pin shackles are characterized by their distinct round pin and are designed to handle heavy loads. They are one-piece plated and forged, making them durable and resilient in high-temperature applications. As all the loading is taken directly by the pin, these shackles have an unbeatable strength-to-weight ratio. They are suitable for use with manila rope or wire rope. These shackles offer good corrosion resistance for long-term exposure to harsh weather conditions.

Galvanized and Stainless Steel Finishes

Corrosion Resistance

One of the critical distinctions between galvanized and stainless steel finishes is their corrosion resistance. Galvanizing adds a protective layer to steel to shield it from many corrosive elements. In contrast, stainless steel is more consistently resistant to oxidation and water damage. These characteristics significantly affect the life span of metal surfaces with these finishes.

Cost and Durability

Galvanized steel finishes generally cost less than stainless steel because of how it is produced and its availability. Stainless steel has a longer lifespan and can better resist corrosion in extreme temperatures or wet environments. In general, galvanizing is more effective at mild to moderate levels of protection against oxidation and water damage. At the same time, stainless steel provides superior defense against extreme weather conditions.

Alloys Used in Manufacturing

Galvanized finishes are typically made with carbon steel, an alloy of iron, and other metals such as zinc. On the other hand, stainless steel finishes use chromium, nickel, molybdenum, or some combination of all three. These metals make stainless steel more resistant to corrosion and scratching than galvanized finishes.

Application range of shackle

Shackles are widely used in various industries, such as electric power, metallurgy, petroleum, machinery, railways, chemicals, ports, mines, and construction.

Safety Considerations When Using Shackles

Safety Considerations When Using Shackles
Safety Considerations When Using Shackles

There are several safety considerations to keep in mind when using shackles. It is crucial to ensure that the shackle is free from any defects.

  1. Cracks, sharp edges, overburning, or other deformities.
  2. Do not drill or weld the shackle.
  3. When used, it is also essential to check for wear, deformation, or fatigue cracks in both the body and latch.
  4. Additionally, ensure that no tension is applied to the lateral spacing, that the shaft pin is safely inserted into a safety pin, and that the thread connection is good.
  5. Do not exceed the specified safety load when using a shackle.

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