BUMAX Fasteners Solve Corrosion Challenges for TU Darmstadt's Flow Test Rig
Enhancing Durability in Extreme Test Conditions
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The Challenge:
Despite being rated at a high mechanical class (12.9), the previously used zinc-laminated steel screws failed to withstand the rig’s demanding operating environment. Continuous water immersion led to rapid corrosion, while high-pressure conditions further stressed the fasteners—resulting in:
- frequent replacements,
- increased maintenance downtime,
- and a risk of structural failure mid-experiment.
These performance limitations not only compromised test reliability but also disrupted research continuity and inflated operational costs. The university needed a fastener solution that combined high strength, corrosion resistance, and long-term durability—with minimal need for intervention.
The Solution Approach:
BUMAX provided a high-strength, corrosion-resistant alternative with the BUMAX® 109 M4x20, ideal for submerged, high-pressure conditions.
Why BUMAX® 109 M4x20 Fasteners Were the Ideal Fit:
✔️ Exceptional corrosion resistance (2.5% molybdenum, premium austenitic stainless steel)
✔️ High mechanical strength (900–1,100 MPa yield strength)
✔️ Non-magnetic—eliminates electromagnetic interference
✔️ Stable clamping force under thermal and pressure cycles
✔️ 12x longer service life compared to coated carbon steel screws
The Results:
The implementation of BUMAX® 109 fasteners brought immediate, measurable improvements to system performance and maintenance efficiency.
✔️ Zero corrosion after immersion testing
✔️ Significantly reduced replacements (from frequent to yearly)
✔️ Increased test rig reliability during long-duration experiments
✔️ Lower lifecycle cost and reduced lab maintenance workload
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