Shackle Dee/ Bow

Rated Stainless Steel Shackles

Rated shackles are manufactured to strict engineering standards and are essential for lifting, rigging, and towing. They are typically made from 304/316-grade stainless steel due to its superior resistance to saltwater and chemicals.

• Identification: These are clearly stamped with a Working Load Limit (WLL), size, and often a manufacturer’s traceability code.
• Safety Factor: Most rated stainless shackles feature a 5:1 or 6:1 design factor, meaning the minimum breaking strength is five to six times the rated capacity.
• Standards: They mostly comply with global safety standards such as ASME B30.26 or ISO 2415.

Non-Load Rated (Commercial) Shackles 

Non-load rated, or “commercial grade,” shackles are not tested to certified safety standards and should never be used for lifting or situations where failure could cause injury.

• Design: They often lack official markings and may be manufactured using casting, which can hide internal air bubbles that weaken the metal.
• Usage: Suitable for non-critical, light-duty applications such as hanging shade sails, fencing, or securing lightweight gear on a boat.
• Materials: Frequently available in both 304 stainless steel and 316 stainless steel.
• Generic Cast Stainless Shackles: Often found in hardware stores for light household or gardening tasks.

Comparison of Shackle Types

The main difference between bow (anchor) and dee (D) shackles lies in their shape and load-handling versatility: bow (anchor) shackles are designed for multi-directional and angled loads, while dee (D) shackles are optimized for straight-line pulls.

 Bow (Anchor) Shackles

Bow shackles, also known as anchor shackles or omega shackles, feature a rounded “O” shaped body. Comes in either screw pin or bolt & nut type.

• Load Versatility: Their rounded shape allows them to handle multi-directional loadingand angled pulls more effectively than D shackles.
• Space for Attachments: The wider loop provides more internal space, making them ideal for connecting multiple sling legs, bulky lifting straps, or wider webbing.
• Common Uses: Frequently used in complex rigging, offshore lifting, and scenarios where a load may shift or rotate.

Dee (D/ Chain) Shackles

Dee shackles, or sometimes known as chain shackles, have a narrower, straight-sided body that resembles a standard chain link.  Comes in either screw pin or bolt & nut type.

• Strength in Line: They are generally stronger and sturdier for straight-line, vertical lifts compared to a bow shackle of the same size.
• Side Loading Risk: They are not recommended for side or angular loads, as the narrow shape can twist or bend under lateral force.
• Compact Design: Their streamlined profile allows them to fit into tight or confined spaces where a bulky bow shackle might not.
• Common Uses: Ideal for single-point connections, towing, and industrial rigging where the pull is direct and stable.

Summary Comparison Table