Tonly's DD Type Rubber Fender, also known as a Double D-shaped or D Section Fender, is engineered for maximum protection in the most demanding marine and industrial environments. Its unique double-D profile provides significantly enhanced energy absorption and impact resistance compared to standard designs, making it the ideal heavy-duty solution for large commercial vessels, busy ports, and high-traffic docks. Manufactured by Tonly, a leading D rubber fender manufacturer, every DD fender is built with premium-grade rubber compounds to ensure long-lasting durability against abrasion, ozone, and extreme weather. The flat back design guarantees straightforward installation and low maintenance, offering a reliable and cost-effective cushioning system to safeguard both your valuable assets and infrastructure.
According to the installation methods,DD-type rubber fenders are divided into side hole mounted fenders and up and bottom hole mounted DD-type fenders.
Up and bottom hole mounted DD-type fenders Specitication
Performance
Performance Curve
Side hole mounted DD-type fenders Specitication
Performance
Performance Curve
Double D-Shaped Profile: Enhanced energy absorption and impact resistance.
Heavy-Duty Protection: Ideal for large vessels and busy docks.
Durability: Long-lasting performance in harsh conditions.
Easy Installation: Flat back design for straightforward mounting.
Low Maintenance: Minimal upkeep required.
Versatile Application: Suitable for various marine settings.
Quality Assurance: High manufacturing standards for maximum safety.
Dock Protection: Safeguards docking structures from large commercial vessels.
Cargo Terminals: Absorbs impact from heavy cargo ships during loading and unloading.
Passenger Terminals: Ensures safe docking for ferries and cruise ships.
Hull Protection: Shields the hulls of tugs and workboats during close-quarters maneuvering.
Docking Safety: Provides cushioning during frequent docking and undocking operations.
Impact Resistance: Enhances safety during towing and pushing operations.
Oil and Gas Platforms: Protects offshore structures from vessel impacts.
Shipyards: Used during shipbuilding and repair to prevent damage to both vessels and docks.
Industrial Docks: Ensures safe mooring and docking of industrial vessels and equipment.
Tonly provides two standardized mounting configurations for DD fenders to ensure maximum stability on various surfaces:
Type A: Up and Bottom Hole Mounted
Best for: Direct quay wall mounting where vertical stability is paramount.
Benefit: Provides a clean, symmetrical appearance and high pull-out resistance.
Type B: Side Hole Mounted
Best for: Mounting on tugboat hulls or ship sides where space is limited.
Benefit: Allows for easier bolt access during maintenance in tight configurations.
Yes. Tonly’s DD-type fenders are engineered for high flexibility. They can be:
Pre-Curved: We can factory-mold the fenders to a specific radius for tight bow curves.
Field-Bent: Smaller D-section fenders can often be bent during installation to fit the contour of a tugboat or a rounded dock corner.
Our high-elasticity rubber compound ensures that even when curved, the fender maintains its structural integrity and energy absorption capacity without cracking or premature aging.
While often used interchangeably, DD-type specifically refers to a D-section fender with a D-shaped inner bore and a flat mounting base.
DD-Type: Features a D-shaped hollow center, providing a higher energy absorption-to-reaction force ratio compared to solid or small-bore D-fenders.
Standard D-Type: May include cylindrical bores (DC-type) or be solid.
The "Double-D" (DD) profile is the industry standard for heavy-duty protection, offering a more stable contact surface and better compression performance for large vessels and busy quay walls.
The choice depends on your installation environment and maintenance access:
Side-Hole Mounting: Best for vessels, tugboats, and workboats. It allows bolts to be secured from the side, which is ideal when the internal hull access is limited.
Up-and-Bottom Hole Mounting: Best for fixed dock structures and quays. This method provides a more symmetrical distribution of the reaction force and prevents the fender from twisting under heavy shear loads.
Tonly Customization: We can pre-drill mounting holes to any specific pitch (spacing) and diameter required by your project’s engineering drawings.
Need top-quality rubber fenders for boats and docks? Tonly offers premium, durable fenders for exceptional protection. Ideal for commercial or recreational use. Contact us for more details.
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