Who are we?
We are a Finnish welding workshop, we manufacture steel components for the needs of the construction and industrial sectors. Our workshop’s products enable the joining of steel and concrete. The work is carried out with a good attitude, a relaxed approach and always in an agreed manner.
If necessary, we deliver both standard products and special solutions from our workshop at short notice.
Our company was founded in 1975 and our product range consists of custom-made products manufactured according to customer drawings, products we have designed ourselves and standard products intended for fastening concrete elements.
Quality that is easy to build on
Our factory operates in accordance with the certificates EN 1090-1:2009 + A1:2011 and our production and products are monitored by Kiwa Sertifiointi Oy and Nordcert AB. Our quality system is based on the requirements of the standard SFS-EN ISO 9001.
We, like our products, are made of tough material. You can rely on us even in urgent situations. It’s easy to build on us.
Semko’s history
During our more than 50 years in the industry, we have become known as a manufacturer of prefabricated structural and fastening details and today also as a workshop that can deliver custommade special steel components.
Our clientele is found in both the construction industry and other industries.
In 1975, the company started operating under the name Semtu Oy/Seinäjoki factory, from which the Semko Oy Semtu workshop was separated in a business transaction in 1995. This made Semko a family business with flexible domestic production.
In addition to domestic customers, we also deliver a large number of steel components outside Finland. Exports currently play a significant role in Semko’s sales.
We currently have several robotic welding lines and various manual welding equipment in use.

For the designer
We have designed and calculated our standard products so that you can focus on a comprehensive design. As a designer, we provide you with usage and calculation instructions that make structural design easy and flexible.
Products
We offer a comprehensive range of standard products for connection and fastening solutions in concrete construction. The range includes fastening plates, foundation bolts, corner fasteners, wall and column shoes, expansion joints as well as slab hangers for hollow core slabs, balcony fasteners and Jasu lifting containers for concrete. Come and take a look!
Interested?
Do you have any questions about our products? Do you need more specialized steel components? Call or send a message and request a quote. We will respond with our long experience in steel products.
Call Semko and ask more – let’s solve your project together.



