Swedish fastener manufacturer BUMAX has been chosen to supply high strength and corrosion resistant fasteners for the high-profile Slussen infrastructure project in central Stockholm.

Construction company Skanska has ordered approximately 15,000 BUMAX fasteners to be used on the water lock’s sluice hatches.

Named after the locks between Lake Mälaren and the Baltic Sea, the Slussen area in central Stockholm is being redeveloped with new stainless steel sluice and flood gates to help the region cope with the anticipated sea level rise in the coming century. The SEK 15.8 billion (US$1.6 billion) project, which includes road and rail infrastructure as well as rebuilding the lock and sluice system, and is expected to be complete in 2025.

The gates are designed to resist corrosion in the brackish water from Lake Mälaren and the Baltic Sea. Since they cannot be removed once they are in operation, their strength and corrosion resistance are vital to the project’s 100-year lifespan.

The fasteners specified were a mixture of BUMAX 88 (A4/316L) and BUMAX SDX 109 (Super Duplex), which provide high strength and excellent corrosion resistance. 

Around 90 different types of BUMAX fasteners were ordered for the Slussen project. The largest of these fasteners were BUMAX SDX threaded rods M48x1225 and M36x1125, in class 80.

Due to the size and strength of these largest rods, BUMAX collaborated with RISE (the Research Institute of Sweden) to utilize specialist testing equipment to test the mechanical strength of the fasteners. These tests showed that the rods could reach loads of 886kN (over 90 tons) prior to yield and 1,221kN (over 124 tons) on fracture. Web: Bumax-Fasteners.com