MIM Tolerances

MIM Parts Tolerance MeasurementMetal Injection Molding (MIM) part tolerances are nominally ±0.3%-0.5%, although tighter tolerances can be achieved in some cases if deemed essential. MIM component production ranges over a large size range, making it difficult to address tolerances directly over such a wide range. In some instances, the choice has been to create a table of tolerance versus size, showing capabilities as follows: These tolerances can be obtained within a single batch but wider variation is usually observed over time.

  • ± 0.05 mm (0.002 inch) for features below 3 mm (0.12 inch)
  • ± 0.08 mm (0.003 inch) for features between 6 and 15 mm (0.25 to 0.6 inch)
  • ± 0.25 mm (0.01 inch) for features between 30 and 60 mm (1.2 to 2.4 inch).
featurebest possible ±nominal or typical ±
absolute dimension0.025 mm (0.001 inch)0.05 mm (0.002 inch)
flatness 0.1%0.2%
hole diameter0.04%0.1%
hole location 0.1%0.3%
perpendicularity0.1% or 0.1°0.2% or 0.3°
surface roughness0.2 µm (8 µ inch)0.8 µm (32 µ inch)
corner radius0.075 mm (0.003 inch)0.1 mm (0.004 inch)