BUMAX saves the day for TNO’s project team


[Åshammar, Sweden, and Delft, the Netherlands, May XX, 2024.] Swedish premium fastener manufacturer BUMAX was selected to solve a potential galling issue in an adaptive secondary mirror for a NASA telescope in Hawaii. A special variant of its high-performance DX 129 model was delivered within 24 hours to TNO to solve a manufacturing error in the adaptive secondary mirror structure.

The Dutch organisation TNO developed an adaptive secondary mirror for NASA’s Infrared Telescope Facility (IRTF) in Hawaii. Following a manufacturing error that was discovered during the integration phase in the Netherlands, TNO required an immediate fastener solution to be able to proceed with the integration.

TNO turned to specialist fastener manufacturer BUMAX which delivered critical fasteners to overcome the galling (wear) issues discovered in the assembly. Within 24 hours, BUMAX had supplied TNO with a special variant of its high-performance DX 129 model, known for its excellent strength, ductility and corrosion resistance, which solved the problem.

“Critical to have no delays”

“BUMAX really saved the day at a point in our project when it was critical that we had no delays,” said Matias Kidron, Project Manager Space Systems Engineering at TNO. “The next day delivery of the screws was quite a feat and was greatly appreciated by our entire project team and enabled us to stick to our schedule.”

The BUMAX DX 129 EPK fasteners used for this application were a special variant of the BUMAX standard high-performance DX 129 product grade. DX 129 EPK benefits from even higher surface hardness, making them almost impervious to galling. DX129 EPK also has the advantage of lower surface roughness and a cleaner finish to the fasteners, which eliminates the need for any potential additional lubrication in applications where contamination or outgassing may be of concern.

Secondary mirror for a clearer view

The NASA’s Infrared Telescope Facility (IRTF) is a 3.0-meter infrared telescope located at an altitude of around 4,200 m, at the summit of Mauna Kea on the island of Hawaii. It is operated by the University of Hawaii under a cooperative agreement with NASA. Designed for maximum performance in the infrared portion of the spectrum, it takes advantage of the excellent visibility, minimal water vapor and low thermal background that characterize the atmosphere above Mauna Kea. The secondary mirror upgrade project is realized together with The University of Hawaii and The University of California Santa Cruz. The secondary mirror allows the mirror to correct for the distortion of the atmosphere to ensure the IRTF’s view of celestial bodies is as sharp and detailed as it can possibly be.

BUMAX often chosen for challenging scientific R&D projects

BUMAX fasteners have been chosen for many scientific high-profile projects and products, including CERN, ISS, Opus Aerospace and the Einstein Telescope project. They have also been used on the European Southern Observatory Extremely Large Telescope (ESO ELT) in Chile, which required a high-strength corrosion-resistant solution.





For additional information please contact:


Nimeka de Silva

Head of Marketing, BUMAX AB

Tel: +44 (0) 7904 980037   |   +44 (0) 1527 593780

Email:  nimeka.desilva@bumax.se


About BUMAX:

BUMAX is the world-leading specialist manufacturer of premium stainless steel fasteners in a variety of steel grades that provide optimal safety and reliability in the most demanding customer applications. Customers include CERN, ABB, Alfa Laval, Alstom, Vestas, Rolls Royce and many more in industries such as marine, automotive, oil and gas, chemical processing, energy, defense, pulp and paper, construction and general engineering. BUMAX is headquartered in Åshammar in Sweden’s steel district and has a global footprint with offices or distributors in more than 30 countries on four continents. BUMAX is fully owned by the listed Swedish Bufab Group. Find out more at https://www.bumax-fasteners.com/.

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