Technical Manufacturing Drawings of a Product Design

Ultimate Checklist: 5 Things Suppliers Need for Effective Part Manufacturing

Published: June 6, 2024


In the world of manufacturing, clear and precise communication is the cornerstone of success. Without it, costly mistakes and delays can easily occur. This article will outline the five key pieces of information you must provide to suppliers to ensure your parts are made correctly and efficiently.

Overview: We will cover the following critical items in detail:

  • CAD Models
  • Technical Drawings
  • Tolerancing
  • Material Specifications
  • Finish Specifications

CAD Models

Definition: CAD (Computer-Aided Design) models are digital representations of physical parts. They are essential for accurately designing and visualizing parts before manufacturing.


  • Accurate Representation: CAD models ensure an accurate representation of the part’s geometry.
  • Visualization: They allow suppliers to visualize and understand the part’s complex shapes and structures, leading to better manufacturing outcomes.

Best Practices:

  • Common File Formats: Provide CAD models in commonly used file formats such as .STEP, .IGES, or .DWG.
  • Detailed Dimensions: Include all necessary dimensions and specifications within the model to avoid any ambiguity.

Technical Drawings

Definition: Technical drawings are detailed, 2D representations of parts that highlight critical dimensions, features, and notes not easily seen in CAD models.


  • 2D Representation: They provide a clear and precise 2D representation of the part.
  • Critical Details: Technical drawings highlight critical dimensions and features that are essential for accurate manufacturing.

Best Practices:

  • Clarity and Precision: Ensure drawings are clear, precise, and easy to read.
  • Multiple Views: Include all necessary views (top, side, section, etc.) to give a comprehensive understanding of the part.
  • Labels: Clearly label all critical features and dimensions to prevent any misinterpretation.


Definition: Tolerancing specifies the allowable variation in part dimensions, ensuring that parts fit together correctly in assemblies.


  • Dimensional Control: Tolerancing controls the dimensions to ensure parts fit together and function as intended.
  • Assembly Fit: Proper tolerances prevent issues during the assembly process, reducing the risk of part rejection or rework.

Best Practices:

  • Standardized Systems: Use standardized tolerance systems such as ISO or ASME to maintain consistency.
  • Clear Indications: Clearly indicate tolerances on both CAD models and technical drawings.
  • Functional Requirements: Consider the functional requirements of the part when setting tolerances to balance precision and manufacturability.

Material Specifications

Definition: Material specifications define the type and grade of material to be used for a part, impacting its performance, durability, and cost.


  • Correct Material Use: Ensures the correct material is used, which is critical for the part’s functionality and performance.
  • Performance Impact: Material choice affects various properties such as strength, hardness, and resistance to wear and corrosion.

Best Practices:

  • Detailed Descriptions: Provide detailed material descriptions, including grade, type, and relevant standards.
  • Property Requirements: Specify any particular material properties required, such as hardness, tensile strength, or thermal resistance.

Finish Specifications

Definition: Finish specifications describe the required surface finish of a part, impacting its appearance and surface properties.


  • Final Appearance: Determines the part’s final appearance, affecting its aesthetic appeal.
  • Surface Properties: Influences surface properties such as smoothness, corrosion resistance, and wear resistance.

Best Practices:

  • Type of Finish: Detail the type of finish required, such as anodizing, powder coating, or plating.
  • Surface Roughness: Include specifications for surface roughness if relevant to the part’s function.
  • Post-Processing: Mention any post-processing treatments needed to achieve the desired finish.


Recap: To ensure parts are manufactured accurately, provide suppliers with comprehensive CAD models, precise technical drawings, clear tolerancing, detailed material specifications, and specific finish requirements.

Final Thoughts: Providing complete and accurate information to suppliers is crucial for successful manufacturing. It minimizes errors, reduces costs, and ensures high-quality parts.

Call to Action: Review your documentation practices today to ensure you’re providing these five critical items to your suppliers, ensuring a smooth and efficient manufacturing process.

Additional Resources


Contact Information: For personalized assistance with your manufacturing needs, contact Step One Engineering Consulting at or get a quote here.


What is the role of CAD models in manufacturing?
CAD models provide a detailed digital representation of parts, essential for accurate design and visualization before production.

Why are technical drawings important?
Technical drawings offer a clear 2D representation of parts, highlighting critical dimensions and features that might not be evident in CAD models.

What is tolerancing, and why is it important?
Tolerancing specifies allowable variations in part dimensions, ensuring parts fit together correctly and function as intended.

How do material specifications impact manufacturing?
Material specifications ensure the correct material is used, affecting the part’s performance, durability, and cost.

Why are finish specifications necessary?
Finish specifications determine the part’s final appearance and surface properties, impacting functionality, corrosion resistance, and aesthetic appeal.

How can I ensure my documentation is complete for suppliers?
Review your documentation practices to ensure you provide comprehensive CAD models, clear technical drawings, precise tolerances, detailed material specifications, and specific finish requirements.


Submit a Comment

Your email address will not be published. Required fields are marked *