What Are Square Rubber Fenders
Square fenders are a type of extruded rubber fender, similar to D-Type fenders, but with greater rigidity and impact resistance. They are often chosen for heavier-duty applications where vessels encounter more extreme berthing forces.
Square Fender Types
OLIPORTS provides three standard profiles of square fenders:
SD-Type Square Fender
Square with D-shaped hollow core. Excellent shock absorption and flexibility. Suitable for both horizontal and vertical mounting.
SC-Type Square Fender
Square with round core (. Enhanced energy absorption with lower reaction force. Ideal for lightweight protection.circular bore)
Solid-Type Square Fender
No hollow core, maximum stiffness. Maximized durability and wear resistance. Preferred for heavy-duty workboats and tugboats.
Sizes range from 100×100mm to 500×500mm, with custom lengths, chamfered edges, drilled holes, or pre-curved profiles available for complex mounting. OLIPORTS can deliver custom lengths, beveled ends, pre-drilled holes, and vulcanized corners for curved hull sections.
Mounting Methods for Extruded Square Fenders
Correct installation of square rubber fenders is essential to ensure long-term performance and protection. OLIPORTS supports three mounting options tailored to different fender types and application requirements.
⚠️ All sizes and installation methods can be customized. Final drawings are tailored to your berth design and fender configuration.
External Angle Bracket Fixing for SC-Type & Solid-Type
Ideal for SC-type and solid square fenders, this method uses fillet-welded steel bars to form corner brackets for secure external mounting.
Method A – For SC-Type and Solid-Type Fenders
This method uses fillet-welded angle bars on both sides of the fender. It Applies to: SC-Type (with circular bore) and Solid-Type (solid core fenders).
- Fillet-welded steel angle brackets on both sides
- Minimum 12.5mm spacing from base width
- Drill through the fender and bar; bolt shank above fender base
- Optional steel strip in base or bore
- 🔧 Recommended for: SC-Type (Circular-core) and Solid-Type fenders
Mounting Steps:
- Use metal bars welded into angle brackets on both sides of the fender.
- Keep spacing between bars ≥ 12.5mm from the fender’s nominal base width.
- Drill through both steel and rubber so the bolt shank sits above the base.
- Optional: Place steel strip inside bore to reinforce beneath bolt.
- Use galvanized or non-ferrous materials for bolts.
Internal Steel Strip Reinforcement for SD-Type
Commonly used for SD-type fenders, this method reinforces the inner bore with a steel strip and bolt-through fixing for high-stress applications.
Method B– For SD-Type Square Fenders
A flat steel strip is inserted into the fender’s circular bore.
- Drill bolts: 18″ centers max; screws: 12″ centers
- Enlarged top holes for bolt head clearance
- Overlap into next fender section with at least one bolt
- 🔧 Recommended for: SD-Type (D-core) and Solid-Type fenders
Applies to:
- SD-Type (D-core)
This method is especially suitable for longer fender sections and curved installations.
Mounting Steps:
- Insert a flat metal strip into the D-shaped bore of the fender.
- Drill through both rubber and metal: Bolts at max 18″ intervals, Screws at max 12″ intervals
- Top hole should be enlarged for bolt head clearance.
- Extend metal strip into next fender to ensure overlapping fixation.
- Use galvanized or non-ferrous materials for bolts.
Drilled & Countersunk Fixing for Solid-Type Fenders
Solid square fenders can also be fixed by drilling countersunk holes at regular intervals, ensuring flush bolt integration for smooth surfaces.
Method C– Direct Drilling – For Solid-Type Square Fenders
An alternate method for solid fenders:
- Drill and countersink holes at set intervals (up to 18″)
- Countersink half the depth for bolt head flush-fit
- Clean aesthetic with reliable mounting
Proper anchoring depth, flatness of the quay surface, and fender spacing must be considered during installation. Custom mounting templates and dimension drawings can be provided by OLIPORTS upon request.
Dimensions of Square Fenders
SD-Type (D-bore) Squae Fender Dimensions
SD-Type Rubber Fender Dimension Table (100mm to 500mm)
| Model | A (mm) | B (mm) | C (mm) | D (mm) | Weight (kg/m) | Max Length (mm) | Bolt Size | Flat Bar |
|---|---|---|---|---|---|---|---|---|
| SD-fender 100x100mm D-bore 50x45mm | 100 | 100 | 50 | 45 | 9.9 | 6000 | M12 | 40×5 |
| SD-fender 150x150mm D-bore 70x65mm | 150 | 150 | 70 | 65 | 22.7 | 6000 | M16 | 50×8 |
| SD-fender 200x150mm D-bore 90x65mm | 200 | 200 | 90 | 95 | 30.8 | 6000 | M20 | 70×10 |
| SD-fender 200x200mm D-bore 90x95mm | 200 | 200 | 90 | 95 | 39.8 | 6000 | M20 | 70×10 |
| SD-fender 250x200mm D-bore 120x95mm | 250 | 200 | 120 | 95 | 49.4 | 6000 | M24 | 90×12 |
| SD-fender 250x250mm D-bore 120x120mm | 250 | 250 | 120 | 120 | 61.1 | 6000 | M24 | 90×12 |
| SD-fender 300x250mm D-bore 140x115mm | 300 | 250 | 140 | 115 | 75 | 6000 | M24 | 100×12 |
| SD-fender 300x300mm D-bore 125x135mm | 300 | 300 | 125 | 135 | 92 | 6000 | M24 | 100×12 |
| SD-fender 400x400mm D-bore 200x200mm | 400 | 400 | 200 | 200 | 153 | 6000 | M30 | 150×15 |
| SD-fender 500x500mm D-bore 250x250mm | 500 | 500 | 250 | 250 | 239 | 6000 | M36 | 180×20 |
SC-Type (O-bore) Squae Fender Dimensions
SC-Type Rubber Fender Dimension Table (100mm to 500mm)
| Model | A (mm) | B (mm) | C (mm) | D (mm) | Weight (kg/m) | Max Length (mm) | Bolt Size | Strip |
|---|---|---|---|---|---|---|---|---|
| SC-fender 100x100mm O-bore 50mm | 100 | 100 | 50 | 15 | 10.1 | 6000 | M12 | 50×6 |
| SC-fender 150x150mm O-bore 65mm | 150 | 150 | 65 | 20 | 23.6 | 6000 | M16 | 60×8 |
| SC-fender 200x200mm O-bore 75mm | 200 | 200 | 75 | 25 | 43.8 | 6000 | M20 | 80×10 |
| SC-fender 200x200mm O-bore 100mm | 200 | 200 | 100 | 25 | 39.5 | 6000 | M20 | 80×10 |
| SC-fender 250x200mm O-bore 100mm | 250 | 200 | 100 | 30 | 52 | 6000 | M24 | 90×10 |
| SC-fender 250x250mm O-bore 100mm | 250 | 250 | 100 | 30 | 67.2 | 6000 | M24 | 100×10 |
| SC-fender 300x250mm O-bore 100mm | 300 | 250 | 100 | 30 | 82.6 | 6000 | M24 | 100×10 |
| SC-fender 300x300mm O-bore 125mm | 300 | 300 | 125 | 30 | 93 | 6000 | M24 | 110×12 |
| SC-fender 350x350mm O-bore 175mm | 300 | 300 | 175 | 35 | 121 | 6000 | M30 | 120×12 |
| SC-fender 400x400mm O-bore 200mm | 400 | 400 | 200 | 35 | 158 | 6000 | M30 | 130×15 |
| SC-fender 500x500mm O-bore 250mm | 500 | 500 | 250 | 45 | 247 | 6000 | M36 | 150×20 |
Solid-Type (Solid core) Squae Fender Dimensions
Solid-Type Rubber Fender Dimension Table (100mm to 400mm)
| Model | A (mm) | B (mm) | C (mm) | D (mm) | Weight (kg/m) | Max Length (mm) | Bolt Size | Flat Bar |
|---|---|---|---|---|---|---|---|---|
| Solid-square-fender 100x100mm | 100 | 100 | 25 | 15 | 12 | 6000 | M12 | 50×6 |
| Solid-square-fender 150x150mm | 150 | 150 | 30 | 20 | 27 | 6000 | M16 | 60×8 |
| Solid-square-fender 200x200mm | 200 | 200 | 40 | 25 | 48 | 6000 | M20 | 80×10 |
| Solid-square-fender 250x250mm | 250 | 250 | 50 | 30 | 75 | 6000 | M24 | 100×10 |
| Solid-square-fender 300x300mm | 300 | 300 | 60 | 30 | 108 | 6000 | M24 | 110×12 |
| Solid-square-fender 350x350mm | 350 | 350 | 65 | 35 | 147 | 6000 | M30 | 120×12 |
| Solid-square-fender 400x400mm | 400 | 400 | 70 | 35 | 192 | 6000 | M30 | 130×15 |
Common Applications of Square Fenders
- Tugboats / Pilot Boats
- Floating pontoons / piers
- Loading bays
- Workboats
- Quaywalls
- Ship hull edge protection
Related OLIPORTS Products
Why Choose OLIPORTS Rubber Fenders?
At OLIPORTS, we understand that rubber fenders are not just buffers—they are critical to the safety and efficiency of your port operations. That’s why we take fender engineering seriously—from raw materials to design to global delivery.
Premium Rubber Compounds, Superior Performance
OLIPORTS rubber fenders are made from high-quality natural rubber blended with advanced synthetic rubbers such as Styrene Butadiene Rubber (SBR) and Butadiene Rubber (BR). These compounds offer outstanding mechanical and environmental durability, ensuring excellent reaction force and energy absorption across our D-type fender range:
- Reaction Force (R.F.): From 77 kN (100mm) up to 383 kN (500mm)
- Energy Absorption (E.A.): From 1.4 kNm to 35.9 kNm
Every batch of rubber meets international material standards, including:
- Tensile Strength / Elongation at Break: GB/T528, ASTM D412, ISO 37 : ≥16Mpa
- Hardness: GB/T531, ASTM D2240, DIN 53505 : ≤ 84 Degree
- Compression Set: GB/T7759, ISO 815, JIS K 6261 : ≤ 30 % ( 70℃, 22h, 25%)
- Tear Resistance: ASTM D624 Die B, BS ISO34-1 : ≥70 kN/m
- Abrasion Resistance: GB/T9867, ISO 4649 : ≤150mm³
- Bond Strength Steel to Rubber: ≥7 kN/m
- Ozone Resistance: No surface cracks (40°C, 48h, 50 pphm at 20%)
All OLIPORTS marine fender products come with full certification from CCS, ABS, BV, DNV-GL, and SGS.
Engineered by Know-How, Not Just Numbers
We don’t just manufacture—we engineer. OLIPORTS brings over a decade of hands-on port equipment experience. We understand the critical parameters that affect fender system selection:
- Ship Information: Deadweight, LOA, displacement, bow radius, hull pressure
- Berth Conditions: Fender spacing, deck level, soffit level, tide range, wind force
- Site Conditions: Water salinity, winter ice presence, climate zones, UV exposure
This allows us to recommend the most suitable fender type, size, and installation system, with full customization options.
Expertise That Cuts Rework and Guesswork
From fender sizing to drawing approval, from sample production to mass delivery—we reduce the trial-and-error. OLIPORTS is known for:
- Reviewing drawings with technical accuracy
- Reducing sample delivery time and rework
- Producing fenders that fit right, perform well, and last long
Every project is handled with attention to detail, to ensure that your fender system performs safely from day one.
Manufacturing + Global Fulfillment
With global delivery experience across more than 40 countries, OLIPORTS offers fast, professional, and reliable service. Whether it’s one berth or an entire terminal, we support your port project with reliable rubber fender solutions built to ISO and IACS standards.
Get Your Fender Solution & Price.
Need help selecting the right fender system for your berth？Want to Know the Price of Square-Type Rubber Fenders？Let us help you select the right D fender size and configuration for your berth. 💡 Based on your port design, berthing energy, and vessel data, we’ll provide:
⚙️ Recommended drawings & specifications
💬 A tailored quotation with best lead time
📎 Support for class approval documents
Contact Us
We’re here to assist you with any inquiries. One of our product specialists will get back to you within 24 hours with the information you need.
