Posted to News on 3rd Dec 2025, 09:00
The strongest stainless bolts just got smarter
BUMAX bolts are now available with built-in preload sensors to enable remote preload monitoring, analysis and insights. Strainlabs - a provider of comprehensive smart-bolt systems - has made this possible by adding its sensor technology to BUMAX bolts.
BUMAX bolts with Strainlabs sensors give peace of mind by verifying in real time that each individual bolt is securely fastened. Being able to monitor bolts remotely also reduces the need to make manual inspections, which saves time - particularly when bolts are installed in inaccessible applications.
"Strainlabs and BUMAX have known each other for many years and have a great relationship. The two companies' high level of expertise match each other perfectly," Csaba Madru, CEO of Strainlabs.
Strainlabs initiated the project by adding their sensors to BUMAX bolts and are available in BUMAX 88 and BUMAX 109 from dimensions M10 to M27.
BUMAX 88 high-strength bolts with Strainlabs' pre-load monitoring solution are being piloted on a railway track between Sweden and Denmark. The pilot involves monitoring the fasteners used to secure so-called particle magnets that help prevent issues caused by iron dust when trains brake and roll over track insulators. The magnets effectively collect iron dust and prevent the accumulation of dust that could cause short circuits - and ultimately rail disruption.
"Considering the tough conditions, the high quality and superior strength of BUMAX bolts made them an obvious choice to be the bolt supplier for this pilot project," says Madru.
Physical inspections of the particle magnets are currently required to make sure they remain securely fastened, which is resource intensive on the long stretches of continuously trafficked railway. This pilot project is part of a larger ambition to transition to safer and more data-driven work methods, aiming to reduce the need for physical presence on site particularly for critical and hard-to-reach bolted joints.
The BUMAX 88 bolts provide a reliable solution by combining exceptional tensile strength with outstanding resistance to harsh environmental conditions. This ensures that they maintain optimal preload over time, even in challenging conditions such as on the railway track where vibrations and extreme weather are constant factors.
