Kidney Bollard

Kidney Bollard

  • Material: Cast Steel or Ductile Cast Iron
  • Capacity: 10 – 200 Tonnes
  • Finishing: Sand Blast to Sa2.5 with rust preventative primer
  • Line Loading Range: ±180° horizontal; +60°/-15° vertical
  • Certificate: ABS, LR, BV, NK, CCS, etc.

Kidney Bollard is an important part of the mooring system, which is one of the most common bollards for jetty, quay and wharf. It is usually a short post on the wharf/quay, used to fix the mooring ropes to hold the ship.

Kidney Bollard is very simple, it is designed with a thicker diameter at the top (head/tip of the structure) to make the mooring rope more difficult to accidentally escape. It is made of ductile cast iron or cast steel, and the surface is sandblasted to Sa2.5, and then completely painted or with anti-rust primer, which can be used in harsh environments. Its mooring line capacity ranges from 10 tons to 200 tons, covering various mooring line capacity requirements from small ports to large bulk cargo handling terminals.

Kidney Bollard is particularly suitable for applications where tidal ranges are small, and is a popular choice for warping operations along quay-sides. We particularly recommend a vertical mooring angle of 0º to 40º for this type of bollard, although it can be used between -15º and 60º. For horizontal mooring, it works best at 180º. The wide size range makes it an ideal choice for small ship berths and large bulk cargo terminals.

As a professional marine equipment supplier in China, Boomarine can design and produce mooring bollards according to your requested drawings and technical requirements. All our bollards are provided with a warranty of at least 18 months. Usually, our bollards have a life span of 15 to 20 years. If you are looking for any mooring bollards, Boomarine will be your best choice.

Features of Kidney Bollard

  • Long service life of up to 20 years.
  • Durable design and good corrosion resistance.
  • Ductile cast iron and cast steel materials are suitable for extreme weather.
  • Mooring purpose applications up to 200 tons.
  • Perfect for multi-use berths.
  • Special designs are available upon request.
  • The cost-effective, simple design and ease of use make it an economical solution for securing ships through mooring rope winding methods.

Applications of Kidney Bollard

  • Small ship berth 
  • Large bulk cargo terminal
  • Oil & Gas terminals 
  • Commercial jetty
  • Container & Fishing wharfs

Difference Between Ductile Cast Iron & Cast Steel

Ductile cast iron and cast steel are the most commonly used materials for kidney bollards. Both can be used in various applications.

Ductile Cast Iron Cast Steel
Properties Quality Equivalent standards Quality Equivalent Standards
GB/T11352  ZG230-450 ISO
Yield Strength ≥310 Mpa ≥310 Mpa ≥31 Mpa ≥230 Mpa ≥230 Mpa ≥240 Mpa
Tensile Strength ≥450 Mpa ≥450 Mpa ≥448 Mpa ≥450 Mpa ≥450 Mpa ≥450 Mpa
Elongation ≥10% ≥10% ≥12% ≥22% ≥22% ≥24%

Parameters of Kidney Bollard:

Type Capacity (ton) Bolts
BMS-K15 15 4xM24
BMS-K30 30 4xM30
BMS-K50 50 4xM36
BMS-K80 80 5xM42
BMS-K100 100 7xM42
BMS-K125 125 7xM48
BMS-K150 150 7xM48
BMS-K200 200 7xM56

* Specific size designed according to requirements

Kidney Bollard


A: Please send us the size with detailed requirements, the design with pictures, the quantity and the port of discharge for the fastest pricing.

A: Yes, if we have similar existing samples, we will send them to you, and you only need to bear the freight; if we have to make new samples, you will bear the cost of competitively small samples

A: Yes, we have professional designers to assist you in your design.

A: It takes 7-15 days to make a new sample.

A: Usually mass production takes about 10-30 days.

A: Usually the samples will be delivered by express delivery such as DHL, FedEx and UPS, and the delivery time is about 3-5 days.

A: We have QC/QA to deal with order requirements and international standards. We will send you pictures during and after production.

A: We will send you a tracking number for online tracking.

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