Crosby/Maxtough Shackles

Crosby/Maxtough Shackles
S-209	G-209	G-209A	S-209T	G-2160	G-2130	G-2130A	S-253	S-281

The Crosby Group has built a reputation in manufacturing and shipping products that are known for durability, reliability, and high quality. We have been – and continue to be – trusted by the rigging industry for over a century and are proud to pave the way for innovation in the market. Crosby is a brand you can trust. Every day, we push more than anyone else to make products that are stronger, easier to use, and built to last.

Shackles

A shackle is a U-shaped piece of metal that has a pin or bolt across the opening. They are commonly used for attaching a sling to a load and are a prime connecting link in different types of rigging systems – including crane rigging, boats, and winching.

When it comes to using shackles for your project, you’ll want to ensure that you are using the right type and are using it the right way.

Types of Shackles

Round Pin Shackles:

Round pin shackles consist of 3 components:

• Shackle bow
• Bolt
• Cotter pin

Round pin shackles are generally used in tie down, towing, suspension, or lifting where the load is strictly applied in-line.

Screw Pin Shackles:

Screw pin shackles consist of 2 components:

• Shackle bow
• Pin

Screw pin shackles can be used for applications involving side-loading circumstances and are often the shackle of choice in pick-and-place applications.

Bolt-Type Shackles:

Bolt-type shackles consist of 4 components:

• Shackle bow
• Bolt
• Nut
• Cotter pin

Bolt-type shackles are recommended for long-term permanent installations where the load may slide on the shackle pin causing the pin to rotate. They can also be utilized when any round pin or screw pin shackles are present.

The Quenched and Tempered Process

Crosby shackles have the highest quality design factor in the industry and are built to ensure that strength, ductility, and fatigue properties are met. Each shackle is closed die forged, which allows for an increased cross section that enhances strength and ductility, coupled with quench and tempering.

The quenched and tempered process has been perfected by Crosby Group and ensures the consistency of performance and maximization of the properties of the steel. The process involves toughness and resilience at all temperatures. Each shackle is built to enhance the impact properties and is derived from special bar forging steel with guaranteed hardening ability.

The quench and tempered process guarantees the Four Performance Characteristics that are crucial in overhead lifting.

These characteristics are:

1. Working Load Limit (WLL): The maximum force a product can support (not to be over-exceeded). The Working Load Limit is clearly marked in the shackle bow.
2. Ductility: The ability to deform in an overloaded condition. This gives warning before ultimate failure.
3. Fatigue Resistance: This is the ability to withstand repeated applications of a load. (A fatigue rated shackle must withstand at least 20,000 cycles at 1½ times the Working Load Limit.)
4. Toughness: The material’s resistance to fracture and cracking.

As you can see, this toughens the shackles like no other and develops a material that reduces the risk of brittle, catastrophic failure. It also enhances the overall performance under cold temperatures and adverse work environments. Your job as a rigging operator, whether on a crane or a boat, demands this type of reliability and consistency. This process allows for product users to have confidence in the shackles that are used. Quenched and tempered shackles are recommended for all critical applications including overhead lifting.