When To Replace Your Shackles (+Shackle Inspection Checklist)

Shackles are essential components in lifting and rigging operations, and, as a result, proper inspection is crucial to ensure their safety, functionality and to prevent load breakage.

In this blog post we will discuss:

• Shackle Inspection Checklist
• Shackles available at MTN SHOP
• Hazards Associated with Using Broken Shackles

 

Shackle Inspection Checklist 

To ensure that the shackles you are using are in good condition and fit for purpose, you should carry out a visual inspection prior to each use. A visual inspection of your shackles can be conducted following the below steps:

1. Check For General Wear & Tear

If your shackle has more than a 10% difference in the dimensions that it is stated to have (you should find this in the user manual or product page), it should be discarded. It will not be able to handle the rated load as the physical size of the shackle has become smaller since its purchase.

 

A shackle that has exceeded its lifespan may look something like this:

 

 

2. Check For Corrosion & Dents

If you find your shackle to have dents on the surface or the metal has corroded, you should cease use immediately as the physical size of the shackle has been reduced - meaning it would be unsafe for it to be carrying heavier loads.

A corroded shackle will look similar to this:

 

3. Check For Signs Of Heat Damage

When producing shackles, they undergo a heat treatment procedure. Consequently, exposure to heat in the field has the potential to reverse this treatment, leading to a weakening of the shackle. This can look like a blue discoloration on the shackle.

 

4. Inspect That Load Bearing Components Are Not Distorted

Any shackles that are distorted from their original shape should be immediately removed from service. This can include shackles that may have become bent, twisted, distorted, elongated, cracked or broken.

 

Below is an image of a distorted shackle that has lost its shape:

 

 

5. Check For Manufacturer Details

Check for markings that state the manufacturer and the shackle's working load limit (WLL). If these have rubbed off, this may be an indication you need to replace your shackle.

 

For example, the CM logo is shown clearly on this shackle

 

6. Check For Any Faults To The Load Pins

When load pins become bent, it indicates that the pin has surpassed its elastic limit, which is the maximum stress the shackle can withstand when carrying a load. If the equipment is still utilized under such conditions, the risk of a dropped load significantly increases, posing potential harm to operators and causing damage to property. Thread damage implies that the pin fails to achieve 100% engagement with the shackle. This increases the risk of shackle failure which can lead to load damage.

 

Below is a shackle equipped with the incorrect pin for its model:

 

  

Hazards Associated with Using Broken Shackles

Here are some of the common risks and hazards associated with the use of broken shackles:

Personal Injuries:

Failing Loads: Broken shackles can cause a load to fall unexpectedly, resulting in serious injuries to workers in the immediate vicinity.

Flail Injuries: Broken shackles can cause loads to become dislodged from their place and swing violently, 

Strains and Sprains: Lifting or moving heavy loads incorrectly to compensate for a broken shackle can lead to strains, sprains, and other musculoskeletal injuries.

 

Property Damage:

Damaged Equipment: Broken shackles can damage the load being lifted, causing dents, scratches, or cracks. In extreme cases, broken shackles can cause the load to disintegrate, resulting in widespread damage.

Damaged Premises: Falling loads can damage buildings, structures, vehicles, and other property in the vicinity.

Production Delays: Accidents involving broken shackles can lead to production delays, downtime, and increased costs for repairs or replacements.

 

Shackles can take on immense loads and ensure smooth operations. However, like any hardworking tool, they require proper care and attention to guarantee safety and reliability. Regular inspections are crucial to catch any signs of wear, damage, or fatigue before they lead to a potential accident. Remember, a quick inspection today can prevent a major issue tomorrow.