At present shackles used widely are made of alloy steel instead of carbon steel in the past. International standard shackles include shackles for lifting, shackles for ship and ordinary shackles. Shackles with big weight and volume are usually installed where seldom disassembled. Safety factor(usually there are 4:1,6:1 and 8:1 available) is an important point when choosing shackles. We must use the shackles according to their Wll. Overuse and overload are both forbidden. Shackles widely used in market include chinese standard, american standard and Japanese standard. American standard shackles are used more because of small volume and big capacity. According to different type, American standard shackles include G209(BW),G210(DW),G2130(BX),G2150(DX); According to different using occasions, american standard shackles include shackles for ship and shackles used on land. For safety factor, there are 4:1, 5:1, 6:1 and even 8:1. For the raw material, there are carbon steel, alloy steel, stainless steel, high-strength steel etc. For the treatment, there are galvanizing(include hot-dip galvanizing and electrogalvanizing), painting and Dacormet available.

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