A shackle, a kind of rigging. The shackles commonly used in the domestic market are generally divided into three categories according to the production standards: national standard, American standard and Japanese standard. According to the form, it can be divided into bow (Omega) and D (U or straight); According to the place of use, it can be divided into marine and land use. Safety factor is 4 times, 5 times, 6 times, or even 8 times (such as Swedish GUNNEBO super shackle). The common materials are carbon steel, alloy steel, stainless steel and high-strength steel. Surface treatment is generally divided into galvanizing (hot plating and electroplating), painting and dacromet plating
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