The new Fusion Marine salmon pens reinforce the working relationship between SSF and Fusion Marine, which stretches more than 20 years.
The new Westerbister farm has also recently created six new jobs locally.
Richard Darbyshire the Orkney regional production manager at SSF, said: “The Fusion Marine Triton pens are fully proven to withstand the harsh and relentless Orkney storms.
"We have previously worked with Fusion on our Wyre and Eday projects and we have been impressed with their professionalism and workmanship.
“As we strive to try and further expand our farming activity in Orkney we will continue to invest with local suppliers.
"This latest order brings almost £1m of spend to the Scottish economy, supporting jobs and enhancing local economic benefits during the construction phase.”
The Triton pen system has been specially developed by Fusion Marine to meet the harsh conditions found in exposed, open sea fish farming locations.
Iain Forbes, director of Fusion Marine, said: “We always strive to work closely with salmon producers in developing fish containment systems that meet their requirements, and Triton is a great example of such co-operation.
“We also take great pride in our after-sales support where we continually liaise with customers to ensure the most efficient operation of their equipment.
“This latest order from Scottish Sea Farms helps ensure job security at our manufacturing base and underlines the importance of fish farming in supporting our rural economy.”
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