An Anti-Loosening Screw to Support Bike Handlebars

Our Solution: Investigating the Issues and Eliminating Them

After observing the fracture surface, our engineers discovered obvious fatigue failure marks and confirmed that the screws broke after undergoing a period of dynamic testing, rather than breaking immediately after being secured. Therefore, we determined that the problem was likely due to insufficient fatigue strength of the screws. With our years of experience in fastener applications, our engineers proposed several improvement measures, including

• enhancing fatigue strength
• reducing stress concentration effects
• increasing anti-loosening effects, and
• streamlining the assembly process.

To verify the performance of the newly designed screws for the application at hand, we specially commissioned the industry-recognized measurement laboratory SGS to conduct dynamic testing. The results proved that our ecosyn® grip screws could pass the stringent BS EN 14766 standard dynamic test, completely resolving the customer's challenge.

Customer Benefits: Solving the Issue and Saving Assembly Costs

With the assistance of the Bossard engineering team, the customer successfully resolved the issue of the original high-strength screws' fatigue resistance. After applying the Bossard-designed ecosyn® grip screws, the customer's product could easily pass dynamic durability tests, entering the market smoothly, and be marketed globally, with an expected output value of tens of millions.

In addition, our simplified design changed the original two-part assembled screw into a single anti-loosening screw – which is expected to reduce assembly time and costs by 20% to 30%, lowering the total cost of ownership (TCO) of fasteners.