In precision machinery, success or failure often hinges on the smallest detail. Under operating conditions involving high-frequency vibration, heavy loads, or rapid start-stop cycles, common issues arise—bolts loosening, transmission precision degrading, or micro-level “creep” occurring between seemingly clamped mating surfaces. The root cause is often the absence of the right friction shim.

Three Limitations of Conventional Shims

In traditional engineering practice, shims are viewed merely as gap-filling components. However, in high-end manufacturing applications, conventional metal shims or standard elastic shims struggle under complex loading conditions, revealing three critical shortcomings:

• Torque Loss: Vibration-induced reduction in preload leads to bolt loosening, creating safety risks

• Fretting Wear: Microscopic relative motion between mating surfaces generates wear debris, causing precision loss

• Insufficient Stiffness: Inadequate support under high-frequency alternating loads

From Passive Gap-Filling to Active Locking

DAOLER Frictionshim is not a conventional shim, but rather a precision tribological solution. By embedding friction coefficient management into an ultra-thin substrate, three core technological advancements are achieved:

1. Microstructured Interface Enables Mechanical Interlocking

The surface features precision-engineered micro-tooth geometries—topologically optimized to create mechanical interlocking with mating surfaces under bolt preload. As verified by DIN 65151 testing, DAOLER Frictionshim maintains over 95% of initial preload under severe transverse vibration, eliminating loosening risks.

2. Optimized Stiffness with Surface Protection

Unlike aggressive locking washers that damage mating surfaces, DAOLER achieves a balanced combination of hardness and coating properties, delivering high frictional resistance while protecting expensive aluminum housings and precision shaft systems—meeting “zero-scratch” assembly requirements.

3. Ultra-Thin Dimensions for Compact Spaces

Available in thicknesses from 0.1mm to several millimeters, with tolerances strictly compliant with ISO standards. Beyond precisely compensating axial tolerances, DAOLER Frictionshim leverages its frictional characteristics to integrate individual components into a unified structure, significantly enhancing system stiffness.

Key Applications

• Robotic Joint Modules: Eliminate backlash between harmonic drives and output flanges; improve repeatability

• New Energy Vehicle E-Drive Units: Prevent bearing migration in high-speed motor shafts; suppress high-frequency whine

• Aerospace Fastening Systems: Deliver maintenance-free permanent locking under extreme temperature fluctuations and vibration

• High-End Optical Instruments: Ensure zero optical axis deviation after set screw locking

Conclusion

In the Industry 4.0 era, equipment failures more often originate from the failure of small connection points than from fracture of large components. DAOLER Frictionshim offers customized friction coefficient pairing based on operating parameters—material hardness, surface roughness, and load spectra—positioning every shim as the most reliable guardian in the precision transmission chain.

Let every fastening become a permanent precision lock.