What is a donut fender？

A donut fender is a circular marine fender designed to slide and rotate around a vertical pile, like a monopile. It protects ships and structures from impact during berthing. The name comes from its circular (donut) shape, which allows it to float and move with the vessel or tide.

Why Is This Topic Important Right Now?

Today’s ports are busier than ever. Ships are larger, tides are unpredictable, and docking areas are tighter. These changes increase the risk of damage during berthing.

Donut fenders solve this problem. They rotate and move with the tide, giving vessels more flexible and reliable protection.

For example, ferry terminals often face rough conditions. A strong tide or a misjudged approach can cause costly damage. Installing a donut fender helps absorb impact and guide the ship safely into position. This keeps people safe, cuts repair costs, and avoids downtime.

How Do Donut Fenders Work?

Donut fenders fit over a vertical pile and float on the water. Their core lets them rotate and move freely up and down with the tide. When a ship hits the fender, its foam-filled body absorbs the energy and protects both the vessel and the structure.

The outer layer uses strong polyurethane to resist wear and weather. Inside, a steel core and bushings let the fender rotate and slide with minimal friction.

01  UHMW PE Pads（Low-friction UHMW bearing pads）

02  Inner Steel Tube（High quality inner steel pipe）

03  Skeleton Layer（Reinforced nylon tire cord skeleton layer）

04  Laminated Structure（Laminated foam core body (Non-Winding)）

05  Foam Core（Fully closed cell foam core）

06  Fender Coating（Black Technology Coating）

Key Benefits of Donut Fender

• 360° Protection: They shield all sides of the pile.
• Tide Friendly: They rise and fall with water levels.
• Rotational Impact Control: They redirect forces and reduce damage.
• Durability: The foam core won’t sink or puncture easily.
• Low Maintenance: No inflation or frequent checks needed.

Where can I buy high-quality donut fenders ?

Nanhai is a world-leading designer and manufacturer of marine fenders, known for producing exceptionally durable products. Our donut fenders, in particular, deliver high energy absorption while exerting less reaction force compared to traditional rubber fenders. Even in the event of accidental damage, they continue to function effectively.

Each donut fender is coated with a cutting-edge polyurea layer—an advanced material independently developed by Nanhai. This high-performance coating offers a range of critical properties, including extreme strength, elasticity, flexibility, deformation resistance, corrosion protection, and UV resistance.

Where Are Donut Fenders Used?

These fenders work well in:

• Offshore platforms
• Bridge foundations
• River terminals
• Ferry landings
• Ship guiding systems

They are ideal for high-traffic and fast-current zones where fixed fenders can’t adapt.

People Also Ask (Related Questions)

• What are marine fenders used for?
  They absorb energy when ships dock, protecting both the vessel and the structure.
• How do you install a donut fender?
  You slide it over a vertical pile and fix it in place with a stopper ring. The process is quick and simple.
• How is a donut fender different from a cylindrical fender?
  A donut fender rotates and moves with the tide, while a cylindrical fender stays fixed in one spot.
• What materials make up a donut fender?
  Most use closed-cell foam inside and a polyurethane skin outside, with a steel core for strength.

Looking for Quality Marine Fenders?

Choosing the right fender can make or break your marine project. Donut fenders offer smart protection with minimal upkeep. They work around the clock to guard your piles and vessels from damage.

Need help selecting the best option? Contact our marine fender team today for expert advice and custom solutions.