Qingdao Haosail Machinery Co., Ltd.

When selecting rigging hardware for lifting, tensioning, or structural applications, understanding the difference between a shackle and a turnbuckle is essential. Although both are widely used in rigging systems, they serve very different functions and should never be used interchangeably.

As a professional shackle and turnbuckle manufacturer and supplier, we often help customers choose the right hardware for safe, compliant, and cost-effective rigging solutions. This guide explains the key differences between shackles and turnbuckles, their applications, and how to use each correctly.

What Is a Shackle in Rigging Applications?

A shackle is a U-shaped or bow-shaped lifting connector secured by a removable pin. Shackles are designed to connect rigging components such as wire rope slings, chains, hooks, and lifting points, and are rated for lifting loads.

Common Types of Lifting Shackles

Bow Shackle (Anchor Shackle) – Allows side loading and multi-leg slings

D Shackle (Chain Shackle) – Best for straight-line lifting

Screw Pin Shackle – Popular for temporary rigging

Bolt Type Shackle – Used in permanent or critical lifting operations

Key Features of Shackles

Designed specifically for lifting and load-bearing

Clearly marked Working Load Limit (WLL)

Suitable for dynamic and static loads

Manufactured to ASME, EN, or DIN standards

Typical Shackle Applications

Crane lifting and hoisting

Construction and infrastructure projects

Offshore and marine rigging

Industrial material handling

Lifting shackles are safety-critical components and must always be selected according to load requirements and applicable standards.

What Is a Turnbuckle Used For?

A turnbuckle is a mechanical device used to adjust tension or length in wire ropes, cables, or threaded rods. It consists of a central body with left-hand and right-hand threads, allowing precise adjustment by rotation.

Common Types of Turnbuckles

Eye & Eye Turnbuckle

Hook & Hook Turnbuckle

Jaw & Jaw (Clevis) Turnbuckle

Eye & Jaw Turnbuckle

Key Features of Turnbuckles

Designed for tensioning, not lifting

Provides length and alignment adjustment

Typically used in static or semi-static systems

Available in carbon steel, galvanized steel, and stainless steel

Typical Turnbuckle Applications

Guy wires and structural bracing

Architectural cable systems

Marine rigging and fencing

Suspension and alignment systems

Most standard turnbuckles are not rated for lifting and should never be used in hoisting operations.

Shackle vs Turnbuckle: Key Differences Explained

Function

Shackle: Connects rigging components and carries lifting loads

Turnbuckle: Adjusts tension and length in a rigging system

Load Rating

Shackles are manufactured with a clearly defined WLL

Turnbuckles are generally rated for tension only, not overhead lifting

Adjustability

Shackle: Fixed length connection

Turnbuckle: Adjustable length and tension

Safety Standards

Lifting shackles: ASME B30.26, EN 13889, DIN standards

Turnbuckles: DIN 1480 or equivalent (non-lifting use)

When Should You Use a Shackle?

Use a shackle when:

The application involves lifting or hoisting

A secure and rated connection point is required

Loads may experience movement or dynamic forces

Safety regulations require certified lifting hardware

Example: Connecting a wire rope sling to a crane hook using a bow shackle.

When Should You Use a Turnbuckle?

Use a turnbuckle when:

You need to tension or align wire ropes or cables

The system is static or semi-static

Fine adjustment of length is required

No lifting or overhead load is involved

Example: Adjusting tension in a cable railing or structural support system.

Can a Turnbuckle Replace a Shackle?

Absolutely not.
A standard turnbuckle should never replace a lifting shackle. Turnbuckles are not designed to handle shock loads or dynamic lifting forces.

In many professional rigging systems, shackles and turnbuckles are used together:

Shackles provide secure lifting connections

Turnbuckles provide tension adjustment

How to Choose the Right Shackle or Turnbuckle

When selecting rigging hardware, always consider:

Working Load Limit (WLL)

Lifting or tensioning application

Load direction and connection method

Environmental conditions (corrosion, outdoor use)

Required standards and certifications

Working with a reliable shackle and turnbuckle supplier ensures product quality, compliance, and long-term safety.

Conclusion: Shackle vs Turnbuckle

Although shackles and turnbuckles are both essential rigging components, they serve completely different purposes.

Shackles are lifting-rated connectors

Turnbuckles are tension-adjustment devices

Choosing the correct hardware is critical for safe rigging, efficient operation, and regulatory compliance. As an experienced rigging hardware manufacturer, we provide a full range of shackles and turnbuckles for global lifting and tensioning applications.