The guide bushings are made of high-grade bearing bronze. The guide borehole is precision turned to ISO tolerance H6, the outside diameter to ISO tolerance h5. As the guide borehole is machined while the guide bushing is in a prestressed condition, control measurement of the guide bushing is not possible in its delivered, non-stressed state.

The radial borehole for mounting the parallel pins is configured to ISO tolerance H7.

The transport of lubricant to the various chambers is realized in the FDK- FDL series by an additional borehole. The lubricant used is predominantly mineral oil, whose viscosity is adjusted to the respective operating conditions.

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