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What is a rigging shackle?

What is a rigging shackle?

Apr 4th 2025

A rigging shackle is a critical component in lifting and rigging operations, providing a secure connection point between hardware such as slings, chains, and hooks. Though simple in appearance, shackles are engineered to handle high loads and play an essential role in safe and efficient material handling.

Professionals must understand the types, materials, and standards governing shackles to ensure proper use. The ASME B30.26 standard defines shackle design, use, inspection, and marking requirements—helping ensure consistency and safety across industries.

Key Takeaways

  • A rigging shackle is a U-shaped connector used to secure lifting components to loads.
  • The main components of a shackle are the bow, ears, and pin.
  • The two most common types are anchor (bow) shackles and chain (D) shackles.
  • Screw pin shackles are widely used for temporary "pick and place" operations.
  • Bolt-type shackles (also called safety shackles) are preferred for semi-permanent or long-term installations.
  • Shackles must comply with ASME B30.26 and feature clear markings, appropriate Working Load Limits (WLL), and proper design factors (typically 5:1, though some models exceed this).
  • Major manufacturers include Crosby, Van Beest Green Pin, Columbus McKinnon (CM), and Skookum.

Anatomy of a Rigging Shackle

Each shackle consists of:

  • Bow: The curved body of the shackle. Anchor shackles feature a rounded bow for multi-directional loads, while chain shackles have a straighter “D” shape for straight-line pulls.
  • Ears: The two sides that house the pin.
  • Pin: The removable locking mechanism. Pin styles include screw pin, bolt-type, and round pin.

Common Types of Rigging Shackles

Anchor (Bow) Shackles

With a rounded bow, anchor shackles allow for angular and side-loading. Ideal for connecting multiple slings or for situations where load direction may change.

Chain (D) Shackles

Narrower and better suited for straight, in-line loads. Their shape maximizes strength along a single axis.

Pin Types: Screw Pin vs. Bolt-Type

  • Screw Pin Shackles: Ideal for temporary lifting tasks. Easy to remove and reinstall for quick operations.
  • Bolt-Type Shackles: Also known as safety shackles. Include a bolt, nut, and cotter pin for permanent or vibration-resistant installations.

Specialty Shackles

Shackle Design Factors

ASME B30.26 requires a minimum design factor of 5:1 (ultimate strength to WLL). Some shackles, such as the Crosby G-209, offer a higher design factor of 6:1.

Required markings include:

  • Manufacturer's name or trademark
  • Size
  • Working Load Limit (WLL)

Materials and Environmental Considerations

Shackles are typically made from:

  • Carbon Steel (most common)
  • Alloy Steel (for high-strength applications)
  • Stainless Steel (for corrosion resistance)

Choose galvanized or stainless finishes for marine or outdoor use.

Major Shackle Brands

  • Crosby: Made in the USA. Offers premium shackles with high design factors.
  • Van Beest Green Pin: European-made. Known for consistent quality worldwide.
  • Columbus McKinnon (CM): Made in the USA. Offers carbon and alloy shackles.
  • Skookum: Made in the USA. Specializes in high-strength alloy steel shackles.

Safety and Inspection

  • Inspect shackles before each use.
  • Conduct periodic, documented inspections based on frequency and environment.
  • Remove shackles from service if they show cracks, deformation, excessive wear, or illegible markings.

Conclusion

Rigging shackles are essential for lifting operations. Choosing the correct type, understanding pin options, and complying with ASME standards all contribute to safety and efficiency.

Work with trusted brands and suppliers like Bishop Lifting to ensure the integrity of your lifting system. Contact us or browse our online catalog to find shackles that meet your project requirements.