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ASME Y14.5-2018 (R2024)

Dimensioning and Tolerancing
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ASME Y14.5-2018 (R2024)

Dimensioning and Tolerancing

PUBLISH DATE 2019
PAGES 347
ASME Y14.5-2018 (R2024)

The ASME Y14.5-2018 standard, titled Dimensioning and Tolerancing, is the authoritative guideline for the practice of Geometric Dimensioning and Tolerancing (GD&T).


Purpose of ASME Y14.5-2018

The primary function of this standard is to establish a unified and symbolic language for specifying dimensional and geometric requirements for parts and assemblies. Specifically, it establishes:

  • Symbols, Definitions, and Rules for geometric characteristics such as flatness, position, and profile.
  • Requirements, Defaults, and Recommended Practices for stating and interpreting dimensioning and tolerancing.

Its ultimate goal is to ensure the clear, precise, and unambiguous communication of design intent across all stages of product realization—from design to manufacturing to inspection.


What is it Used For?

ASME Y14.5-2018 is used by engineers, designers, manufacturers, and quality control professionals to define and control the form, fit, and function of mechanical parts. Key applications include:

  • Design Specification: It allows designers to define the nominal (theoretically perfect) geometry and specify the maximum allowable variation (tolerance) for every feature of a part.
  • Manufacturing Efficiency: By defining tolerances based on a part's function, it enables manufacturers to use the largest possible tolerances without compromising performance, thereby reducing costs and scrap rates.
  • Interchangeability and Assembly: It ensures that parts manufactured in different places, by different teams, or at different times will still fit and function correctly in an assembly.
  • Quality Assurance: It provides the foundational rules for inspection, ensuring that quality control teams have a standardized method for verifying that a manufactured part meets the design specifications.

In essence, the standard helps transform a conceptual design into a functional, manufacturable, and inspectable product.

SDO ASME: American Society of Mechanical Engineers
Document Number Y14.5
Publication Date Feb. 11, 2019
Language en - English
Page Count
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