Jun 02,2022
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Why Choose CDY Shackles


Carbon shackles should be at a minimum of 6 to 1, and alloy shackles a minimum of 5 to 1.



All Dayu shackle bows and pins are quenched and tempered, which enhances their performance under cold temperatures and adverse field conditions. Dayu’s carbon shackles are recommended for all critical applications including overhead lifting. Alloy shackles are recommended when specific dimensional requirements dictate a size that requires higher working load limits. Dayu shackles provide the tensile strength, ductility, impact, and fatigue properties that are essential if they are to perform time after time in adverse conditions.



The mechanical properties of steel when a load is repeatedly applied is known as its fatigue strength. Fatigue testing determines the ability of a material to withstand repeated applications of a load. The load by itself may be too small to produce a failure. There are three factors involved when considering fatigue strength: the number of cycles at which a crack initiates, the number of cycles at which the crack starts to grow, and the number of cycles at which the fitting fails. One accepted method of fatigue rating fittings is to test them to 1-1/2 times the working load limit for 20,000 cycles, without failure. This standard test is accepted as indicating indefinite life when used within the working load limit under normal circumstances.



Shackles markings to include manufacturer name or trademark, size, and working load limit. Shackle pin to have mark or symbol.



Hot dip galvanizing to be in accordance with ASTM A153/A153M, class B or equivalent.

Zinc plating to be in accordance with ASTM B633, Type II, Class Fe/Zn 12.

When zinc coating alloy steel, procedures to guard against embrittlement according to ASTM A143/A143M or equivalent is required.

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