Know What to Look For and When to Remove a Shackle from Service
Rigging | How To's | By Henry Brozyna | Feb 25, 2021
Improper use or care of shackles can result in serious accidents that not only injure employees but damage property as well. To avoid this, shackle inspection is critical. In accordance with ASME B30.26, shackles should be visually inspected before every use.
Any part of the shackle is worn more than 10 percent of the original dimensions.
If this happens, it typically means that the physical size of the shackle is smaller, therefore it cannot handle the rated load and becomes dangerous to use.
The shackle has excessive pitting, corrosion, nicks or gouges. If a shackle has excessive pitting, that is usually a sign of corrosion. When this happens, material is being lost and the shackle dimensionally becomes smaller. Therefore, it cannot handle its rated capacity.
Similarly, nicks and gouges are an intrusion on the original dimensions of the shackle and create a stress raiser on the shackle. Material is moved or removed from the shackle, making it smaller in size and unable to handle the rated load.
Load bearing components are bent, twisted, distorted, stretched, elongated, cracked or broken.
Any shackles that are distorted from their original shape should be immediately removed from service.
Indication of heat damage. When shackles are manufactured, they go through a heat treatment process. Therefore, being exposed to heat in the field can reverse that process and weaken the shackle. Heat damage can be difficult to see, but there are a few key items to look for:
Missing or illegible manufacturer’s name or trademark, working load limit or size. Every CM shackle is forged with the CM logo, its body or diameter size, trace code, USA, “Forged” and its specified working load limit. These markings should be visible on the shackle.
Load pins are bent or have visibly damaged threads. When load pins are bent, the pin has gone past its elastic limit. If the product continues to be used, there is a higher chance of a dropped load, which can injure operators and cause property damage. Damaged threads mean that the pin is not making 100% engagement with the shackle. This can lead to a failure of the shackle.
Henry Brozyna is an Industry Product Trainer at Columbus McKinnon specializing in Crane and Hoist Inspection and Repair, Rigging & Load Securement He has been training on crane and rigging safety for more than 20 years. Henry is a member of the Tie Down committee and former Board of Directors for the WSTDA; this group writes the standards that are used by the material handling industry, the transportation industry, and also law enforcement. Henry is also a current member of the Crane Institute’s board of directors.
Best Practices for Using Shackles Safely
Shackles are used every day in a variety of rigging and load securement applications.
Our customer's concerns over appropriate standards, shackle markings, ratings and safety are addressed with ASME guidelines.
Our Columbus McKinnon Training Team answers a customer's question about shackle pin length, referencing rigging practices from ASME B30.26.