Sigmetrix helps enterprise leaders build higher quality, cost effective solutions—faster than ever before. 

    Our comprehensive solutions are trusted by teams across the enterprise in a variety of industries to help identify mechanical variation faster, resulting in more efficient processes and more cost-effective products


      How We Help

      Produce higher-quality, cost-effective products across the enterprise.

      Who We Help

      Solutions for manufacturers, engineers, and designers in a variety of industries.

      Where We Help

      Build better products and processes across the enterprise. 

      Robust solutions that streamline and enhance the mechanical variation management process.

      Our tolerance analysis and GD&T solutions  unite the ideal world of product design with the real world of manufacturing and assembly—where mechanical variation has a significant impact on product cost.



        Tolerance Analysis

        Predict, manage, and optimize mechanical variations.


        Understand permissible variation earlier in the design process.

        Model-Based Definition

        Optimize tolerances within 3D models.

        Meet the Team

        We've been helping build better products for 25+ years. 

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        We integrate directly with several major CAD platforms.

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        Tolerance analysis and GD&T solutions for a variety of industries worldwide.

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        Resources to help you better manage mechanical variation. 

        Case studies, whitepapers, webinars, and more resources backed by our tolerance analysis and GD&T experts.


          Resource Center

          Learn how you can produce better products, reduce development costs, and more.


          We publish frequently on mechanical variation management, GD&T best practices, and more.

          GD&T Basics – An Introduction

          What is GD&T?

          A design model is an idealized representation of a part design. However, the design model by itself does not fully define the design. Due to imperfections in manufacturing and inspection processes, physical parts never match the design model exactly. An important aspect of a design is to specify the amount the part features may deviate from their theoretically exact geometry (as defined in the design model).

          Geometric dimensioning and tolerancing, often referred to as GD&T, is a symbolic language used on engineering drawings and models to define the allowable deviation of feature geometry. The language of GD&T consists of dimensions, tolerances, symbols, definitions, rules, and conventions that can be used to precisely communicate the functional requirements for the location, orientation, size, and form of each feature of the design model. Thus, GD&T is an exact language that enables designers to “say what they mean” with regard to their design models. Production can then use the language to understand the design intent and inspection looks to the language to determine set up requirements.

          GD&T Basics as a standard for assembly design & production:

          In order for any language to be effective, it must be based on a common standard. ASME and ISO both have standards related to the application and use of GD&T. The ASME standards are generally used by U.S. companies while the ISO standards are commonly used by European companies. Within each of those organizations there are several standards that are applicable to the topic of GD&T. Furthermore, each standard is periodically revised, with each version of the standard identified by the year of its acceptance. GD&T Advisor v1.2 is based on the following standards:

          • ASME Y14.5M-1994 Dimensioning and Tolerancing – Defines the usage and meaning of geometric tolerances and related topics
          • ASME Y14.41-2003 Digital Product Definition Data Practices – Defines the rules for displaying of annotations on the design model



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