You’ll frequently see a wide range of small, medium and large D-shackles or bow shackles listed for sale by size, and frequently the product information might include pin size as well. However, be aware that the key measurements given under any D-Shackle specifications will be the diameter of the material used in the body section - the pin measurements will usually be longer than this.
It’s important to keep appropriate sizing (i.e. material thickness) in mind when planning and making a shackle purchase, as this is the key specification that will dictate the suitability of a given shackle for use under certain loads.
The first port of call for judging the suitability of a shackle for handling a certain payload should always be the manufacturer guidelines for safe working load (SWL). Sales should be backed up with clear information in this regard, and a product’s rated tolerance will often be visibly imprinted on the shackle itself.
Other measurement information - such as the pin length, or the distance between the shackle body eyes when new - is worth retaining access to throughout the working lifespan of the shackle, as it can help to diagnose and identify warping or bending over time. A shackle whose eye-to-eye distance exceeds that listed in the manufacturer’s specifications should not be used.
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