Locking Device for Spectacles

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OBE Ohnmacht & Baumgärtner GmbH
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Locking Device for Spectacles
Benefit: Increased Component Complexity
Main Forming Process: Metal Injection Moulding
End Use Sector: Consumer Goods
Material: Ferrous

Finishing: Only tumbling operation is needed


For this revolutionary and extremely small locking device for spring hinges in spectacles the minimized size is combined with a complex shape. For a safe locking function the geometry of the part had to be designed with special features and produced in large volumes.


The component was designed from the beginning to be made using MIM, as its weight of only 0.028g and high precision, meant only MIM could guarantee the necessary specification. This is also due to the huge quantity per year needed using a 32 cavity mould.

Component Specification

Product Density: (g/cm3) 7.9
Product Hardness: 120 HV10
Weight: 0.028g / 0.046g depending on version
Product Tensile Strength: 510 MPa
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