Planning and Design Tips

Tolerances

Tolerances

The spring characteristics of MEGI mounts depend on the elastomer hardness H and the geometric dimensions. The tolerance range of hardness H amounts to ± 5 Shore A. This fluctuation range yields a spring rate tolerance of approx. ± 20 % and thus a tolerance within the calculated natural vibration frequencies of approx. ± 10 %. By means of special measures the hardness tolerance can be narrowed to ± 3 Shore A. The spring rate tolerance drops correspondingly to ± 15% and that of the natural vibration frequencies to ±7%.

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The dimensional tolerances are defined in DIN ISO 3302-1. MEGI mounts fall under class M3. The following table gives the permitted dimensional deviations to DIN ISO 3302-1 M3 class M 3 as a function of the nominal dimension range for mold-related and non-mold-related dimensions.

The adherence of rubber coating (Gummihaut) is permitted to a certain extent, even if that is not clear from the drawings presented here. It is often necessary for production reasons. There are no metal tolerances but only the rubber tolerances indicated in the table.

Nominal size range [mm]   Permitted size deviation
F – mold-related size ± mm		 Permitted size deviation
C – Non-mold-related size ± mm
  to 6,3 0,25 0,4
over 6,3 to 10 0,3 0,5
over 10 to 16 0,4 0,6
over 16 to 25 0,5 0,8
over 25 to 40 0,6 1,0
over 40 to 63 0,8 1,3
over 63 to 100 1,0 1,6
over 100 to 160 1,3 2,0