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ASME B46.1-2019

Surface Texture (Surface Roughness, Waviness, and Lay)
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ASME B46.1-2019

Surface Texture (Surface Roughness, Waviness, and Lay)

PUBLISH DATE 2020
PAGES 145
ASME B46.1-2019

Purpose of ASME B46.1-2019

The main purpose of ASME B46.1 is to establish a precise, common language for describing and measuring surface finish. This is crucial because surface texture directly impacts a component’s function, such as friction, wear life, sealing capability, and fatigue strength.

The standard ensures uniform communication by:

  • Defining Texture Constituents: It formally defines and provides terminology for the components of surface texture: roughness (finer irregularities from the manufacturing process), waviness (wider spacing errors, often from machine vibration), and lay (the predominant direction of the surface pattern).
  • Standardizing Parameters: It defines dozens of parameters (e.g., R a ​ , R z ​ , R sm ​ ) and the measurement settings (filters, cutoff lengths) required to calculate them accurately.

What is it Used For?

ASME B46.1-2019 is a key reference for design, manufacturing, and quality control professionals across industries that rely on precision. Key applications include:

  • Engineering Drawings: Designers use the standard’s notation and symbols (often in conjunction with ASME Y14.5) to specify the required surface finish on technical drawings, ensuring the manufactured part meets its functional requirements.
  • Measurement and Inspection: It guides technicians on the proper use and calibration of profiling instruments (like stylus profilers). When disputes arise over measurements between a supplier and a customer, this standard provides the agreed-upon methodology for instrument settings and analysis to resolve the disagreement.
  • Advanced Manufacturing: The standard has expanded its scope to include the characterization of unique surfaces created by processes like additive manufacturing (3D printing) and nano surface texture measurement, ensuring that new technologies can also be precisely specified and inspected.

In essence, this standard makes surface texture a quantifiable, measurable engineering characteristic rather than a subjective visual assessment.

SDO ASME: American Society of Mechanical Engineers
Document Number B46.1
Publication Date June 30, 2020
Language en - English
Page Count
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