Hertfordshire Garden Machinery LTD


Cobra Fortis 20B

Original price was: £1,499.00.Current price is: £1,399.00. inc. VAT

Shop2Shed Eligible
20″ Cobra Fortis Petrol Cylinder Lawnmower

Powered by a Briggs & Stratton XR550 engine, the Fortis 20B is designed for larger lawns where a high-quality finish and long lasting, defined stripes are a priority. Its heavy-duty construction ensures precision cutting over an extended period of time and the well-balanced chassis and 6 blade cylinder make this the perfect choice.

› Engine: Briggs & Stratton XR550 / Drive Type: Self Propelled
› Cutting Width: 51cm / 20″ / Cutting Height: 6mm – 30mm
› 3 – 30mm with 10 Bladed Cartridge Attachment (Sold Separately)
› 4.2km/h at 2800RPM
› 6 Blade Cutting Cylinder / Interchangeable Cassette System
› Grass Box Capacity: 75ltr
› Steel Front Roller / Cast Ribbed Split Rear Roller
› Domestic Warranty: 2 Years

Availability: 1 in stock


This product is eligible for Shop2Shed, Hertfordshire Garden Machinery's guarantee that your machine will be assembled, delivered, and demonstrated to you by our friendly, professional team. Find out more here.

cobra fortis 20b

Lawncare Cartridge Range

6 additional interchangable lawncare cartridges that take the hard work out of garden maintenance all year round.
Whatever the garden task, the Fortis cartridge range will have a tool to complete the job with ease. Cobra Fortis lawnmowers have a range of interchangeable lawncare cartridges available which allow you to easily convert your mower to suit different lawn maintenance tasks. For example, you can switch from a 6-bladed cutting cylinder for general mowing to a scarifier cartridge for thatch removal or a verticutter cartridge for removing of lateral growth and coarser grasses.

cobra fortis 20b

Expertly powered by Briggs & Stratton Engines

Powerful, high-performance machines

The Cobra Fortis 20B is expertly powered by a B&S XR550 engine which takes lawnmower power to the next level.

Powerful engines are an essential part of maintaining a beautiful and healthy lawn. B&S engines are not only easy to start, but provide all the necessary power and speed to cut your grass with ease and precision.

cobra fortis 20b
cobra fortis 20b

Heavy-duty drive system

Improved performance & durability

The heavy duty-drive system on the Cobra Fortis range offers improved performance and increased durability.

For use with our Fortis interchangeable cartridge system giving ease of user maintenance and adjustment.

Cartridge system

6 additional interchangeable cartridges

The Fortis lawncare cartridge system is a versatile system available for all Fortis lawnmower models.

Cartridges are fitted with the minimum of effort and including the standard 6-bladed cylinder, 10-bladed cylinder, scarifier, aerator, dethatcher, verticutter, and lawn brush that will keep your lawn looking its finest throughout the year. Whatever the garden task, the Fortis cartridge range will have a tool to complete the job.

cobra fortis 20b
cobra fortis 20b

Easy-fold ergonomic handles

With tool-less handle adjustment

Easily adjust the angle of your handles or fold your Fortis handles for storage using the comfortable tool-less adjusters.

For a precise, breathtakingly beautiful striped finish to your lawn

Split-cast rear roller for the perfect stripes

The heavy-duty split rear rollers on Cobra Fortis lawnmowers not only produce a striped finish to your lawn, but also offer improved manoeuvrability, reduced lawn scalping, giving an accurate cutting height and levelling of your lawn.

cobra fortis 20b
cobra fortis 20b

Optional Accessories Available

Cobra Fortis lawnmowers have some innovative optional accessories available to help
you create the perfect garden with the minimum of effort.

Browse the full cylinder range

cobra fortis 20b

Why buy from us?

At HGM, we're as passionate about customer service as we are about the machines we sell. We go out of our way to help you get the best value and the most out of your purchases. That's why we offer a better, more personal service than any other dealer, both online and in-store.

  • We never sell a machine in a box - whether you choose to have your machine delivered, or to collect from our showroom, every machine we sell comes fully assembled, fueled and oiled/fully charged, and ready for you to take home and use straight away.
  • We hand-deliver to your door - if you find you're having trouble making your way to our showroom, we can deliver your machine to your door, and our friendly driver will even demonstrate the machine for you if you'd like help getting started with it
  • We're here for you even after the purchase - we aren't content to sell you a machine and then walk away. Our phone lines are open 5 days a week for any support or queries about your machine, and if there's an issue with your machine that needs repair, we can take it into our workshop.
  • We'll prioritise you if anything goes wrong - in the rare case that something does go wrong, you'll benefit from top-priority warranty support for machines purchased from us directly.

It's all part of our Shop2Shed service - that's the HGM difference!


Lawnmower Type

Fuel Type


Shop2Shed is HGM’s local, personal delivery & installation service for all webshop sales. Unlike other online retailers, you can rest assured your machine will come fully assembled and inspected, and the full usage of it will be explained on handover by one of our knowledgable and friendly staff.

Find out more here.
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cobra fortis 20bCobra Fortis 20B
Original price was: £1,499.00.Current price is: £1,399.00. inc. VAT

Availability: 1 in stock