SigmaPro Engineering

Ultra-Precise Injection Molded Parts and Mechanical Assemblies

Core Services


Injection molding: very small, very precise parts

Unique injection molds and part processing

Coatings, joining, de-flashing and assembly

Logistics, supply chain, project management

Measuring stereo microscopes, SPC process control

Insert molding, hand loading, very precise

Creative design solutions in plastic and metal


Call us at 
817-337-2708


Case Snapshot 2



One consumer products customer needed a complete, packaged assembly with one unusual part. This part needed three threaded ports, including two internal threads, each with a different pitch, and an internal passage connecting them.

We met this challenge by designing a mold with unthreading cores, geared to turn at different rates, but delayed at mold opening while a separate, skewed core piloted through a hole in one of the rotating cores to form the interconnecting passageway. The outside of the part is beautiful and the consumer has no idea of the mold complexity obvious from the back. This mold has made about 100,000 parts and runs very well.

Case 1 | Case 2 | Case 3 | Case 4