D Fenders

Hongruntong Marine manufactures industrial-grade D Fender bumpers, dock D fender systems and boat D fenders. Durable, low-reaction marine protection with custom sizes, mounting options and global delivery.

Hongruntong Marine is a manufacturer of premium D Fender products, offering complete Dock D Fender, Marine D Fender and boat D fender ranges engineered for long-lasting berth protection. Our D Fender bumpers combine proven geometry and marine-grade materials to deliver consistent energy absorption, low permanent set and reliable service in harsh saltwater environments. Available in standard sizes and custom configurations, Hongruntong D Fender systems are suitable for marinas, commercial quays, ferry terminals and offshore installations.

Hongruntong Marine specializes in manufacturing high-performance D Fender systems designed for optimal marine protection. Our comprehensive product range includes durable Dock D Fender solutions for port infrastructure, robust Marine D Fender systems for various marine applications, reliable D Fender Bumper components, and specialized Boat D Fender products for vessel protection. These engineered D-shaped fender solutions combine innovative geometry with premium materials to deliver exceptional impact absorption and long-term reliability in demanding marine environments.

Characteristics

• Compact D-Shape Profile — Flat face for broad contact, minimal projection from the structure, ideal for narrow berthing pockets and dock edges.

• Excellent Energy Absorption — Designed to absorb impact energy while limiting reaction force transmitted to hulls and quay walls.

• Durable Construction — Marine-grade rubber compounds resist ozone, UV, saltwater and abrasion for extended service life.

• Simple Installation — Multiple fixing options (through-bolt, backing plate, rope or chain mounting) suit new builds and retrofits.

• Low Maintenance — Tough elastomeric material reduces repair frequency and lifecycle cost.

• Versatile Sizes — Range of heights and thicknesses to protect everything from small boats to workboats and service vessels.

• Cost-Effective Protection — Competitive price-per-meter compared with more complex fender systems.

Applications

• Marina berths and floating docks (boat D fender)

• Ferry landings and small-craft terminals

• Commercial quays, service pontoons and workboat berths

• Lock chambers and canal moorings

• Temporary berthing arrangements and retrofit protection

Technical Data

Dimensions

Performance Curve

Detailed Photos

Typical Technical Specifications

Final selection should be based on vessel size, berthing energy and berth geometry.

• Material: SBR / NR (standard) or CR / EPDM (optional for enhanced chemical/UV resistance)

• Profile: D-section (flat front face, curved rear)

• Face Width: 80 mm – 350 mm (model dependent)

• Overall Height: 50 mm – 600 mm

• Thickness (base): 40 mm – 300 mm

• Energy Absorption: varies by size — consult sizing table for kN·m values

• Reaction Force: optimized by profile; lower than equivalent square-section bumpers

• Mounting Options:

  • Through-bolt (with steel backing plate)

  • Adhesive/chemical fix for low-load applications

  • Rope / chain lash-up for floating docks

• Operating Temp: −40°C to +80°C (material dependent)

• Service Life: 8–20 years (site and maintenance dependent)

Installation Guidance

1. Select D Fender size according to vessel displacement, berthing speed and desired stand-off.

2. Prepare backing structure — plate thickness and anchor pattern must match fender loads.

3. For through-bolt installation use marine-grade stainless fasteners and protective backing plates.

4. For floating docks, use rope/chain mounting with chafe protection.

5. Ensure correct compression and alignment — avoid over-tightening which reduces energy absorption.

Why Choose Hongruntong Marine?

• Precision Engineering
  Advanced manufacturing processes ensure consistent D-shaped geometry across all D Fender products

• Quality Assurance
  Each Marine D Fender undergoes rigorous testing for compression performance and structural integrity

• Custom Solutions
  Tailored Boat D Fender configurations available for specific vessel requirements

• Global Standards
  All Dock D Fender products manufactured according to international marine standards

Quality & Service

• Produced under ISO-aligned quality systems.

• Material certificates and test reports available on request.

• Optional FAT (Factory Acceptance Test) and third-party inspection for critical projects.

• Spare parts, replacement skins and installation kits supplied.

FAQ

Q1: What is the difference between a D Fender and a simple rubber bumper?
A1: D Fenders have a D-shaped cross section giving a broad, flat face for vessel contact with improved energy absorption and reduced projection — better for constrained berths than basic block bumpers.

Q2: Can D fenders be used on floating docks and boats?
A2: Yes. For floating docks and small craft, rope or chain mounting and smaller profile D fenders (boat D fender) are common and effective.

Q3: How do I choose the correct D fender size?
A3: Provide vessel size, maximum berthing speed, and berth layout. We’ll perform a sizing check (energy & reaction) and recommend a model.

Q4: Are custom compounds or colors available?
A4: Yes — we offer alternative rubber compounds (for chemical/UV resistance) and color options for visibility or branding.

Q5: What maintenance is required?
A5: Periodic visual inspections for cuts, wear and attachment integrity; replace damaged units or securing hardware as required.