A D-shackle or simply a chain shackle is shaped like a loop of chain. D-shackles are used as connecting links in boats, ships, crane rigging and … .
Screw pin anchor shackle has a larger bow than that of a U shackle; and so it has a larger surface area for riggings such as slings and crane hooks that simply would not fit in the loop of a regular U shackle.
Screw pin anchor shackle links different equipment together as they can be attached and detached easily.
Crosby and Chinese.
A screw pin chain shackle is a U-shaped shackle secured with a screw pin. It connects lifting components. The loop in chain shackles is narrower than the one in anchor shackles. The narrow loop is designed to support a heavier load than a similar size anchor shackle.
Steel shackles are extremely durable and corrosion resistant. Steel shackles are ideal for use in tough conditions.