

Agile and uncompromising partner
Terässaari Oy is a subcontracting engineering company established in 1976, manufacturing demanding parts, subassemblies and complete machines and equipment for industrial needs. We serve customers especially in the pulp and paper, wood processing, concrete and energy industries.
Our production sites in Harjavalta and Jämsänkoski provide strong capacity for even large-scale manufacturing projects. Our versatile machinery, skilled personnel and certified production ensure high quality and reliable deliveries.
We are known for our high-quality, well-finished products, delivery reliability and long-term customer relationships.
We work as a long-term manufacturing partner for Finnish industrial companies. A large share of the products we manufacture are exported worldwide through our customers.
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Reliable production process
Initial contact
At the beginning of the project, we define the objectives together with the customer and clarify the technical requirements.
STAGE01
Assessment
When necessary, we identify special requirements and plan the implementation accordingly.
STAGE02
Implementation
We solve our customers’ challenges with strong expertise in steel and carry out projects in close cooperation with the customer.
STAGE03
Production
Our trained professionals, modern production facilities and certified quality system ensure first-class products even for demanding applications.
STAGE04
Delivery
Our long experience, reliable service and fast delivery times make us a trusted partner. Our production facilities are centrally located in Finland.
STAGE05
Two production sites for demanding assemblies
Our production sites in Harjavalta and Jämsänkoski provide strong capacity for manufacturing large parts, subassemblies and complete machines and equipment. Our versatile production facilities cover machining, sheet metal work, welding, assembly and surface treatment.
Our 3,000 m² production facilities in both Harjavalta and Jämsänkoski are equipped for demanding industrial manufacturing. Terässaari employs a total of forty skilled steel professionals across its two locations.


Certified quality for reliable deliveries
Our customers rely on us when the manufactured solution requires high quality, dimensional accuracy and dependable delivery.
Our certified production ensures a consistently high standard of service. Terässaari’s quality management system is certified according to ISO 9001:2015. In addition, our welding quality system complies with SFS-EN ISO 3834-2. Consistent, high-quality production is an investment that pays off.

Problem-solving in close cooperation with the customer
We support our customers in the manufacture of demanding machine parts, subassemblies and complete machines and equipment. We solve manufacturing challenges together with the customer by developing appropriate and cost-effective production methods.
We specialise in the manufacture and assembly of precision-critical machine components. At the beginning of each project, we assess the order-specific requirements, manufacturability, the suitability of our machinery and other factors affecting the implementation.
With our machining, sheet metal work, welding, assembly and surface treatment capabilities, we can also deliver highly finished assemblies. Our wet painting and blasting facilities enable us to finish even large machines and components ready for delivery.


