Stainless Steel Dee Shackle US Type Anchor Shackle with Ring Screw for Heavy Industry Rigging Parts

Stainless Steel Dee Shackle US Type Anchor Shackle with Ring Screw for Heavy Industry Rigging Parts

Product Description:

Material Advantages:

1. **Core Materials**

- **AISI 304 Stainless Steel**: This is the basic and commonly used material for this type of shackle. It has good corrosion resistance, resisting moisture and mild chemical corrosion in general industrial environments. Its mechanical strength is sufficient to meet the routine lifting and connection needs of most heavy industrial rigging, such as fixing ordinary mining equipment and general machinery lifting. Moreover, its cost is relatively moderate, offering high cost-effectiveness, making it the mainstream choice for mass-produced shackles.

- **AISI 316 Stainless Steel**: This is a higher-grade corrosion-resistant material. Compared to 304 stainless steel, the addition of molybdenum significantly improves its resistance to harsh conditions such as marine salt spray, industrial acid and alkaline environments, and high humidity. It is particularly suitable for heavy industrial scenarios with stringent corrosion resistance requirements, such as offshore oil platforms, chemical equipment lifting, and ship anchor chain connections. It prevents the shackle from losing its load-bearing capacity due to corrosion, ensuring long-term safety.

2. **Key Components and Auxiliary Materials**

- **Ring Screw Pin**: As the core connector of the shackle, its material is usually consistent with the shackle body, i.e., it is also made of 304 or 316 stainless steel. This ensures that the corrosion resistance and strength of the component match the main body, avoiding localized damage due to material differences. Some heavy-duty models' ring screw pins undergo additional forging reinforcement to further improve tensile strength and wear resistance.

- **Special Condition Auxiliary Materials**: For extreme scenarios such as ultra-heavy lifting, some customized models will add carbon steel as an inner reinforcing layer on top of the main body material, or hot-dip galvanize or electro-galvanize the carbon steel components to enhance load-bearing capacity and supplement corrosion resistance. However, these materials are mostly auxiliary; the core load-bearing components are still mainly made of stainless steel.

3. **Surface Treatment and Matching Processes**

The surface of this type of shackle is usually highly polished. This removes burrs from forging or casting, preventing wear when used with ropes and chains. It also further enhances surface smoothness, reduces contaminant adhesion, indirectly strengthens corrosion resistance, gives it a bright silver appearance, and facilitates routine inspection for cracks or other damage.

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Manufacturing Process:

The production process of this American-style stainless steel D-type shackle with spiral pin anchor (for heavy industrial rigging) revolves around "stainless steel material processing + precision forming + strength enhancement + quality inspection and calibration," focusing on load-bearing safety and corrosion resistance throughout. The specific steps are as follows:

### I. Production Process Overview

1. Raw Material Selection and Pre-treatment

2. Forging/Casting of Main Body and Accessories

3. Machining and Precision Finishing

4. Heat Treatment Strengthening (Core Step)

5. Surface Treatment

6. Assembly and Pre-tightening Test

7. Finished Product Inspection and Shipment

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### II. Key Details of Each Step

#### 1. Raw Material Selection and Pre-treatment

- Stainless steel round bars or billets conforming to AISI 304/316 standards are selected. Material composition is confirmed through spectral analysis to avoid excessive impurities.

- Raw materials are cut into blanks of corresponding specifications, and surface oxide scale and rust are removed to ensure proper fit in subsequent processing.

#### 2. Body and Accessories Forging/Casting

- The mainstream method uses **hot forging**: the billet is heated to 1000-1200℃ and forged into the D-type shackle body (bow, cross pin seat) and spiral pin using a die.

- Some high-precision models use precision casting to ensure the forming accuracy of complex structures (such as threads and pin holes), reducing subsequent machining.

- After forging/casting, preliminary sand removal and removal of risers and gates are performed to avoid residual impurities affecting structural strength.

#### 3. Machining and Precision Finishing

- Turning: The spiral pin is threaded (to match the shackle body thread), and the end face is turned to ensure a tight seal.

- Milling/Drilling: The pin holes and connecting holes of the body are machined to ensure dimensional tolerances are within ±0.05mm, suitable for rigging connections.

- Grinding and Polishing: Burrs and sharp edges are removed to prevent scratching of ropes or chains during use.

#### 4. Heat Treatment Strengthening (Core Component)

- Solution treatment is applied to the shackle body and screw pin (304 stainless steel 1050-1100℃, 316 stainless steel 1080-1150℃), followed by rapid cooling to improve material strength and toughness.

- Some heavy-duty models undergo additional tempering to eliminate forging/machining stress and prevent deformation or breakage under long-term loads.

#### 5. Surface Treatment

- High-polish treatment: Mechanical polishing achieves a surface roughness Ra≤0.8μm, enhancing corrosion resistance and aesthetic appearance.

- Passivation treatment optional for special applications: Forms an oxide protective film on the surface, further enhancing resistance to salt spray and acid/alkali corrosion, suitable for marine or chemical environments.

#### 6. Assembly and Pre-tightening Test

- Assemble the screw pin with the shackle body and test the smoothness of the thread fit to ensure no loosening after pre-tightening.

- Install anti-detachment pins (such as cotter pins) to ensure the screw pins do not fall off during use, improving safety.

#### 7. Finished Product Inspection and Shipment

- Non-destructive testing: Use magnetic particle testing or penetrant testing to check for internal cracks, porosity, and other defects.

- Strength testing: Conduct tensile tests at 1.5-2 times the rated load to ensure the breaking load meets the standard and there is no permanent deformation.

- Dimensional verification and material re-inspection: Confirm that key dimensions meet standards, and verify the material again through spectral analysis.

- Qualified products are labeled with specifications, rated load, and material markings, and then packaged for shipment.

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Features:

This American-style stainless steel D-type shackle with spiral pin anchor for heavy industrial rigging boasts advantages in material, structure, and manufacturing process, combining corrosion resistance, high strength, and ease of operation. It is suitable for a variety of harsh working conditions, with specific features as follows:

1. **Superior Corrosion and Rust Resistance, Suitable for Harsh Environments**

The main body is made of 304 or 316/AISI 316L stainless steel. The 316 model, containing molybdenum, resists corrosion even in extreme environments such as marine salt spray, chemical acid and alkali media, and high humidity, preventing rusting. Compared to ordinary galvanized steel shackles, it is not only suitable for the complex working conditions of heavy industry but can also be used in shipbuilding, offshore oil platforms, and other scenarios. Its highly polished surface enhances corrosion resistance and improves aesthetics, making it suitable for use in yacht rigging, stair railings, and other construction applications.

2. **Superior Structural Strength, Reliable Load-Bearing Capacity**

Utilizing an integral forging process combined with heat treatment, the structure is robust and compact, offering superior tensile and impact resistance compared to cast shackles. It meets the heavy lifting requirements of heavy industry, with some models achieving a tensile strength of up to 10 tons. The safety factor is 4:1 or 6:1, and most products are marked with a rated load, while some tested models clearly indicate the safe working load for easy verification during operation and to avoid overloading risks. Furthermore, the oversized helical pin design further enhances the overall load-bearing capacity, reducing damage caused by uneven stress.

3. **Convenient and Efficient Assembly and Disassembly, Suitable for Frequent Operations**

The helical pin design allows for quick connection and disassembly without complex tools, making it particularly suitable for temporary connections of rigging, lifting rings, wire ropes, and slings in heavy industry, or for operations requiring frequent changes of connected components. The smooth thread engagement and strong stability after pre-tightening, along with anti-loosening structures in some models, prevent the helical pin from loosening and falling off during operation, balancing convenience and safety.

4. **Highly Adaptable and Versatile**

Its D-shaped structure allows for concentrated and even load distribution, reducing stress concentration points. It is suitable for high-intensity loads in a single direction and is commonly used as a lifting or anchoring point for hoisting or securing objects. It can also be used as an end accessory to form slings with chains, wire ropes, etc. Specifications cover a variety of sizes, from small to large 120-ton sizes, all customizable to meet the hoisting and securing needs of various heavy industrial scenarios such as mining, water treatment, and automobile manufacturing.

5. **Detailed Compliance and Guaranteed Quality**

The finished product surface is finely polished, free of burrs and sharp edges, preventing scratches to rigging or components during use. Most products comply with standards such as ISO 9001 and are certified by organizations such as SGS. Some products support customized company logos, and key information such as material grade and dimensions are clearly marked on the product itself, facilitating user verification and traceability, and providing convenience for quality control in industrial operations.

Technical Parameters:

Applications:

This American-style stainless steel D-type shackle with spiral pin boasts high strength and corrosion resistance, making it irreplaceable for connection and lifting in various fields such as marine, heavy industry, and construction. Specific applications include:

1. **Marine-related fields:** It is a commonly used accessory in shipbuilding and marine engineering. On one hand, it can be used for anchor chain connections, deck equipment securing, and connecting lifting equipment to cargo during loading and unloading. On the other hand, it is suitable for lifting operations on offshore oil platforms and drilling vessels, and can also be used for securing buoys and fender systems. Furthermore, in fishing trawl operations, it can be used to secure fishing gear components, resisting the highly corrosive environment of seawater salt spray.

2. **Heavy industry field:** This shackle is a core rigging accessory in heavy industry. In the oil and gas industry, it can be used for hoisting and securing drilling equipment and oil pipelines; in the mining industry, it connects mining slings to ore and mining equipment, adapting to the harsh, humid, and dusty environment of mines; in the automotive manufacturing industry, it can be used for hoisting and transferring heavy parts on production lines, and is also suitable for the installation and maintenance of large filtration equipment and pipelines in the water treatment industry.

3. **Construction and Infrastructure:** In large-scale construction projects, it is commonly used for hoisting heavy objects such as concrete beams, steel structure components, and reinforcing bars, serving as a key connector between construction cranes and hoisting slings. Additionally, in power infrastructure, it ensures operational safety through stable load-bearing capacity in scenarios such as power tower installation, hoisting and securing heavy equipment related to transmission lines, and temporary support and bridge component hoisting during bridge construction.

4. **General Lifting and Logistics:** In ports and docks, it can be used in conjunction with cranes to load, unload, and secure containers and large cargo; in equipment maintenance scenarios in various factories, it can assist in hoisting heavy machinery components, facilitating the disassembly and installation of equipment by maintenance personnel. Simultaneously, it can also be used for the transfer of heavy goods in warehouses, serving as a connecting component between rigging systems to improve the efficiency and safety of cargo handling.

5. **Other Specialized Fields**: It can also play a role in certain specialized scenarios where the corrosion resistance and safety of components are highly critical. For example, in the lifting of heavy processing equipment in the food and beverage industry, it can prevent ordinary metal components from rusting and polluting the environment; in the aerospace and military fields, it can be used for high-precision, high-risk operations such as ground lifting of some spacecraft and transfer of military equipment. However, these scenarios place more stringent requirements on the specifications and quality inspection of the shackles.

Support and Services:

After-sales consultation: We provide 24/7 customer service to answer customer questions regarding anchor chain usage, such as anchor chain specification selection, usage methods, and maintenance points.

Regular follow-up visits: The manufacturer may conduct regular follow-up visits to customers to understand the anchor chain usage and collect customer feedback in order to continuously improve product quality and service levels.

Maintenance guidance: The manufacturer or professional organizations will provide customers with anchor chain maintenance guidance, including regularly checking for deformation, rust, and wear of the chain links; cleaning the anchor chain with special cleaning agents and brushes; applying rust-preventive oil or corrosion inhibitors after cleaning; and lubricating the chain link connections.

This high - strength alloy steel painted stud - link anchor chain, with its excellent quality and attentive service, builds a solid guarantee for your maritime career. Choosing us means choosing safety, efficiency, and worry - free operation. Embark on a new journey of navigation, starting from choosing our anchor chain!

Any question please let us know ,our JinCheng maritime will provide you the best service with 7*24 hours ~