Donut Fender

Safety,Stability and Economy are Our Core Product Power

What kind of benefits can Donut Defender bring you in actual application scenarios, how can we ensure its safety and stability, and how can users avoid pitfalls to choose first rate supplier when face to mixed quality foam fender on the market.


Donut Fender

Specific Type Foam Fender

Donut Fender is a specific type of foam fender which is the effective solution for simple berthing dolphins, guiding and turning structures. Due to its construction, the fender floats up and down with the fluctuating water levels and rotates when vessels berth and slide along the fender. 

Donut Fender constructed 100% closed cell foam core, polyurethane skin with continuous nylon filaments. The internal casing has long-lasting, low-friction bearings which need minimal maintenance. The foam is unsinkable and cannot burst or deflate.

donut fender

Donut Fener Applications

  • Locks and dry dock entrances
  • Corner protection
  • Turning/Monopile structures
  • Simple breasting dolphins
  • Bridge protection
  • Large tidal variations area

Donut Fender Features

  • 360° rotates around a pile
  • Rises and falls with water level
  • Fast and easy to install
  • Low shearing forces
  • Low hull pressures
  • Non-marking skin
  • Almost maintenance free
  • Custom sizes
Donut Fender-case-1

Donut Fender Structural Design


Donut Fender can be applied for special purpose, mainly due to the fender Unique Structural Design, Superior Original Material and World-Leading Production Technology.

  • 01-Heavy Duty Inner Tube
  • 02-UHMW PE Pads
  • 03-Closed Cell Foam Core (100%)
  • 04-Nylon Filament Reinforcement Layer
  • 05-Corrosion Resistance Polyurethane Skin

01 Heavy Duty Inner Tube

Galvanized heavy duty inner tube is the support and load-bearing structure. Its strength  directly determines the service life of the fenders. Inner tube can be customized by requirements.

02 UHMW PE Pads

UHMW PE Pads (Ultra High Molecular Weight Polyethylene Pads) which has long-lasting, low-friction with minimal maintenance.

03 Closed Cell Foam Core (100%)

Due to the molecular structure of Closed Cell (Isolation of Gas), so the foam core can maintain excellent elasticity which is the basis of foam fender performance. Donut Fender utilizing only cross-linked, closed cell polyethylene.

04 Nylon Filament Reinforcement Layer

Donut Fender is constructed Continuous Tough and Thick Nylon Filament Reinforcement in Polyurethane skin which provides superior strength.

05 Corrosion Resistance Polyurethane Skin

High performance Polyurethane skin: Anti-acid, Alkali and salt corrosion, Anti-UV resistant, Non-marking which makes the Donut Fender skin extremely durable to all types of weather, forces and marine conditions.

Donut Fender Performance Spec.

Different foam densities present different energy absorption reaction force properties. NANHAI provide Low Capacity | Standard Capacity | High Capacity for selection.

Donut Fender-Low Capacity Details Spec.

PDF for Reference.

Donut Fender-Standard Capacity Spec.

PDF for Reference.

Donut Fender-High Capacity Spec.

PDF for Reference.

Do you have any question?

    Foam Fender Qualifications and Certifications

    NANHAI is the international leading foam fender manufacturer, accumulated nearly 20 years R&D and production experience.

    SHANDONG NANHAI AIRBAG ENGINEERING CO.,LTD. established since 2006, which is the international leading manufacturer in marine fender and marine airbag production. NANHAI is also the China leading brand in offshore buoyancy engineering industry. Company focuses on various areas including port infrastructure, berthing and mooring, offshore floating structure R&D, design and technology application ( offshore wind power, marine aquaculture, oil and gas, bridge protection, etc. ) After nearly 20 years of development, product and technology applications have covered more than 80 countries and regions in 7 continents, NANHAI became the well-known brand in the world.

    ISO 9001:2015
    Quality Management System Qualification
    ISO 14001:2015
    Environmental Management System Qualification
    ISO 45001:2018
    Occupational Health & Safety Management System Qualification
    BV Certifications
    Ocean Defender - BV Type Approval Certifications
    Have Your Attention Please

    NANHAI Other Marine Industrial Forms

    The development of NANHAI during the past 20 years has involved many maritime fields, providing global customers with overall solutions for Berthing, Mooring, Ship to Ship, Ocean Wind Power, Deep-Sea Farming, Buoyancy and Salvage, Bridge Blocking, Ship Launching, Dock Caisson Moving etc.