Kidney Bollards | Durable Ship Mooring Bollards Manufacturer

Heavy-Duty Kidney Bollards for Secure & Flexible Mooring

Kidney bollards are specifically designed for berths with low to moderate tidal ranges, featuring a low profile and compact footprint. The kidney-shaped bollard is a core product within marine mooring equipment, also known as a kidney-shaped mooring post.

As a leading supplier of ship mooring bollards, OLIPORTS ensure our bollards deliver maximum stability for vessel maneuvering and secure mooring across diverse marine environments. Dimensions, materials, and surface treatments can be customized to meet specific client requirements, accommodating mooring needs for vessels of varying tonnages.

OLIPORTS offers a comprehensive range of bollards specifically designed for safe vessel mooring in ports, docks, and shipyards, supplying global customers worldwide.

Technical Features of Kidney Bollards

Material: Ductile iron, cast steel
Load Capacity: 10-200 tons, customizable upon request
Mooring Angle: Horizontal ±180°, Vertical +60°/-15°, Recommended Vertical 0°-40°
Design Standards: ISO / EN / ASTM (project-specific requirements available)
Installation Method: Cast-in, Bolt-on
Surface Treatment: Sandblasting pre-treatment; primer/zinc-based primer; epoxy high-performance coating; hot-dip galvanizing
Applicable Ships: Yachts, fishing vessels, cargo ships, container ships, bulk carriers, and various other vessels
Tags: Kidney Bollards; Marine Bollards; Mooring Bollard; Bollards Types; Dock Bollards; Ship Mooring Bollards
Class Approval: ABS, DNV-GL, CCS, Others

Core Features & Advantages

Durable Material: Manufactured from high-grade ductile iron or cast steel, offering exceptional impact resistance.

Warping Efficiency: Optimized waist design, ideal for smooth rope handling and warping operations.

Load Capacity: Offers a wide range of load specifications from 15 tons to 200 tons.

Versatile Mounting: Supports both embedded and bolted installation methods.

Optimized Base Design: Provides multiple base configurations to accommodate various dock structures. Options include oval/egg-shaped bases; rectangular/square bases; and custom/special-shaped bases.

Kidney Bollards Specification

Capacity	15T	30T	50T	100T	150T	200T
Bolts (in mm)	0.94/M24	1.18/M30	1.42/M36	1.65/M42	1.89/M48	2.20/M56
Bolts Quantity	5	5	5	7	7	8

Notes: Custom size available on request. The above parameters represent partial reference data for standard kidney-type mooring bollards. Actual dimensions, weights, and anchoring methods will be adjusted based on project conditions, berth structures, vessel types, and mooring force calculations.
Port or terminal projects are advised to finalize model selection based on mooring stress analysis, berth layout, and design specifications.

Application range of Kidney Bollards

As a mature and reliable solution in modern mooring bollard systems, the kidney bollards are suitable for various vessel types and diverse mooring conditions.

Commercial Ports & Container Terminals: Secure berthing for cargo ships and tankers.
Shipyards & Dry Docks – Reliable mooring during construction and maintenance.
Yacht Clubs & Marinas – Durable solution for recreational and commercial vessels.
Offshore Energy Platforms – Robust bollards for floating structures and supply vessels.

OLIPORTS kidney-shaped mooring bollards are manufactured using proven casting and machining techniques, with stringent control over structural strength and dimensional accuracy at critical load-bearing points. They are equipped with an offshore-grade anti-corrosion coating system to ensure reliable load-bearing capacity and stable service life under long-term port operating conditions, meeting the quality and consistency requirements of project-based port engineering.

OLIPORTS provide customized bollard specifications tailored to project requirements such as vessel tonnage, berth structure, and mooring loads.

Frequently Asked Questions

What distinguishes a kidney bollard from other types of bollards?

The primary advantage of the kidney-shaped bollard lies in its compact structure and suitability for environments with small tidal ranges. Its reinforced top design effectively prevents mooring lines from slipping, while its adaptable mooring angle makes it ideal for multi-purpose docks and ship shifting/loading operations. Compared to other bollards, it offers superior cost-effectiveness, balancing durability and practicality. With a broad load-bearing range, it accommodates mooring requirements for vessels of varying tonnages.

Is a Kidney bollard suitable for high tidal ranges?

Generally, the kidney bollards are more suitable for ports with moderate to low tidal ranges. For ports with extremely high tidal ranges and steep mooring angles, we typically recommend our T-head or pillar bollards, as they feature larger “drip edges” to prevent ropes from slipping off.

How to Select the Appropriate Specifications for Kidney-Shaped Bollards?

To choose the right kidney bollard, three core factors should be considered:
1. Ship tonnage and mooring rope specifications to determine the load-bearing capacity;
2. Dock installation environment to determine the installation method (cast-in/bolt-on) and size;
3. Corrosion degree of the use environment to determine the material and surface treatment method.
OLIPORTS professional team can provide free selection suggestions according to the specific needs provided by customers to ensure that the products are accurately adapted. We can also provide matching cleat bollard of marine according to the selection of kidney bollards.

Request a Quote or Drawing

OLIPORTS offer: Technical Datasheet PDF、Material Certificates、DWG or STEP files for design integration、On-request layout support. Our lashing experts typically reply within 24 hours. 💡 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

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