Welded D Rings vs Bolt-On Lashing Points: Which Is Better for Heavy Cargo Securing?

Cargo securing hardware plays a crucial role in transportation and marine,. No matter transporting construction equipment, marine machinery, containers, or oversized industrial goods, the strength and reliability of the lashing system directly affect the stability of the transportation. Welded D-rings and bolted lashing points are two common lashing hardware on ship deck, trailer, barges, offshore platform.

Although both D ring are designed to provide a stable anchor point, they have significant differences in structure, installation methods, and load-bearing performance. Choosing the wrong type of d ring may result in deck damage, cargo loosening, and even expensive maintenance problems during transportation.

What is a welded D-ring?

Welded D-rings are permanent lashing points that are welded onto steel decks or structural frames. These heavy-duty D-rings are typically made of forged steel or high-strength carbon steel, specifically for high-load application scenarios.

They are widely used in:

• Deck cargo securing for vessels
• Transportation of offshore platform equipment
• Heavy machinery fastening systems
• Barge deck lashing
• Transportation of wind energy components
• Military and industrial cargo operations

As the D-rings are directly welded to the deck, the force can be more evenly transferred to the ship’s structure. This enables the welded D-rings to withstand much higher working loads compared to many detachable fixed points.

Common rated load specifications include:

• 10-ton welded D-ring
• 20-ton welded D-ring
• 30-ton marine D-ring
• 36-ton heavy-duty D-ring
• 60-ton marine lashing ring

These weld on D ring are particularly common in heavy-duty cargo securing systems that require extremely high strength.

What is a bolt on lashing point?

Bolted lashing points are lashing devices that are fixed to the deck through bolts, nuts and backing plates. Unlike welded D-rings, they are usually easier to disassemble or replace. Bolted fasteners are often used in the following scenarios:

• Securement of light cargo
• Trailer cargo lashing system
• Multi-purpose vehicle transportation
• Temporary fixing point installation
• Application of aluminum alloy deck
• Areas where welding operations are not convenient

The biggest advantage lies in the flexibility of installation. Operators can quickly replace damaged fasteners without cut or re-weld the deck structure.

However, the load capacity of the bolt on system may be relatively low, depending on the bolt grade, deck thickness and installation quality.

Strength Comparison: Welded D-Ring and Bolt-Fastened Secure Points

In scenarios involving the securement of heavy cargo, load-bearing capacity is often the decisive factor.

Welded D-ring

Heavy-duty welded D-rings typically have the following characteristics:

• Higher working load limit (WLL)
• Stronger anti-vibration capability
• More stable structural integration
• Superior long-term durability
• Greater resistance to impact loads

Because its base plate is permanently welded to the structure, the force can be directly dispersed into the main body of the steel structure rather than being concentrated around the bolt holes.

For marine transportation and fixed operations of heavy marine equipment, welded systems are generally regarded as a safer solution.

Bolt on lashing points

Bolt on lashing points may be suitable for applications with lighter loads, but they can become a structural weak point when subjected to extreme loads. Over time, without proper maintenance, continuous vibration and repeated tension can cause the installation bolts to loosen.

In the marine environment that is constantly in motion and subject to dynamic loads, bolted systems usually require more frequent inspections.

Corrosion Resistance in Marine Environments

Seawater corrosion is one of the greatest challenges faced by marine cargo securing fittings. Whether it is a welded D-ring or a bolted securing point, it must be able to withstand the harsh marine environmental conditions.

Common protective coatings include:

• Hot-dip galvanized coating
• Electro galvanized
• Self Color With Oil
• Powder Coating

However, bolted systems often introduce additional corrosion risks at the drilling installation sites. Moisture may seep in through the bolt gaps and cause hidden rusting inside the deck structure.

In contrast, welded D-rings, after proper coating treatment, usually form a more tightly sealed surface, thereby effectively reducing the risk of water infiltration.

For marine cargo securing systems, excellent corrosion resistance is crucial for ensuring long-term operational safety and facilitating maintenance and management.

Differences in Installation Methods

Installation of Welded D-Ring

The installation of welded D-rings must be carried out by professionals through welding operations, and is typically completed concurrently during deck manufacturing or structural modification construction. Considerations during installation include:

• Penetration depth
• Deck plate thickness
• Heat affected zone
• Structural reinforcement
• Welding inspection

Although the installation process is rather time-consuming, a highly secure and permanent anchor point will eventually be obtained.

Installation of bolted type securing points

The installation of the bolt-fixed system is faster and requires less specialized equipment.

Its advantages include:

• Easy to replace
• Faster to maintain
• Lower installation cost
• Suitable for temporary applications

However, improper bolt torque or insufficient back-up reinforcement may reduce its load-bearing capacity.

Which solution is more suitable for marine applications?

For offshore projects, welded D-rings are usually the preferred option.

Heavy marine operations typically involve:

• Continuous vibration
• Sudden wave impact
• Extremely heavy cargo weight
• Extremely bad weather conditions
• Dynamic changing load

Under the above conditions, permanent welded lashing points can provide higher reliability and safety margins.

Bolted type securing points are more suitable for:

• Light transport tasks
• Temporary cargo lashing
• Multi-purpose trailer
• Small-scale commercial applications

Selecting the Appropriate Ship Cargo Securing Hardware

Before choosing a lashing system, operators should comprehensively evaluate the following factors:

• Cargo weight
• Deck structure
• Transportation environment
• Corrosion risk exposure
• Required working load limit (WLL)
• Inspection requirements
• Maintenance expectations

For the lashing requirements of heavy cargo on ships, the forged and welded D-ring remains one of the most reliable solutions in the industry.

Conclusion

In the cargo securing system, the welded D-rings and the bolted securing points on ships each have their own advantages and play their respective roles. The bolted hardware features high flexibility and easy installation; while the welded D-rings stand out for their superior strength, stability and long-term reliability.

For high-demand marine applications involving heavy cargo, oversized machinery or harsh environmental conditions, the heavy-duty welded D-ring remains the preferred accessory for professional deck lashing systems worldwide. If you have any question, don’t hesitate to contact Sail Rigging.