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 4



One customer wanted a plastic part, roughly 0.5 inch long on all sides, with about 100 dimensioned features. This part needed a latching mechanism, and needed to have insert-molded the following: one metal housing, one piece of special viewing glass, and two metal pins that were held to 0.00015 inch total position tolerance and 0.1 degree of angular tolerance. We had to protect the insert-molded glass from fracture by building flow-front shields into the glass holding area. We had to account for the effect of the glass in the overall shrink of the final part. Numerous changes have been made as we cooperated with our customer's long development. This project is seeing ongoing success and growth.

Case 1 | Case 2 | Case 3 | Case 4