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MIM Design Guide

Basic MIM Design Guide

Components made with metal injection molding (MIM) are similar to those made by plastic injection molding in complexity and artifacts. Gate, ejector pin, and parting line artifacts are mostly unavoidable and need to be strategically located for both application and process. MIM is best suited for components that will fit on the palm of your hand and components that have thin wall sections. A flat feature to provide uniform support for sintering is one feature that is strongly recommended to avoid sintering fixturing costs.


Design Do's

  • Maintain uniform wall thickness
  • Core out thick areas
  • Design with a flat surface, lettering, and threads
  • Consider location of gates, ejector pins, and parting lines

Design Dont's

  • Don’t design walls thinner than 0.1 mm (0.0039 in)
  • Don’t design holes smaller than 0.1 mm (0.0039 in) in diameter
  • Don’t design components over 12.5 mm (0.5 in) thick and over 100 grams in mass
  • Don’t design sharp corners

Printable MIM Design Guide MIM Design Book

Typical Attributes Produced by the MIM Process


Component Mass (g) 0.030 10-15 300
Max Dimension (mm) 2 (0.08 in) 25 (1 in) 150 (6 in)
Min Wall Thickness (mm) 0.12 (0.005 in)* 15 (0.2 in) 15 (0.6 in)
Tolerance (%) 0.02% 10.5% 1%
Density 93% 98% 100%
Production Quantity 1,000 100,000 100,000,000

*Features this small could have distortion.

Further Information: Handbook of metal injection molding, ed. D. Heaney, ISBN: 978 0 85709 066 9.