ISO 21920-2:2021 PDF

Geometrical product specifications (GPS) — Surface texture: Profile — Part 2: Terms, definitions and surface texture parameters

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Title (English):

ISO 21920-2:2021

Geometrical product specifications (GPS) — Surface texture: Profile — Part 2: Terms, definitions and surface texture parameters

Document status:: Active
Format:: Electronic (PDF)
Number of pages:: 78
Publication date:: December 20, 2021
Edition:: ISO IS 21920 edition 1 version 1
ICS:: 01.040.17

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Description (English):

This document specifies terms, definitions and parameters for the determination of surface texture by profile methods. NOTE 1 The main changes to previous ISO profile documents are described in Annex I. NOTE 2 An overview of profile and areal standards in the GPS matrix model is given in Annex J. NOTE 3 The relation of this document to the GPS matrix model is given in Annex K.

Technical details

Technical committee: ISO/TC 213 - Dimensional and geometrical product specifications and verification
SKU: ISO 21920-2:2021

Abstract

Overview

ISO 21920-2:2021 - Geometrical product specifications (GPS) - Surface texture: Profile - Part 2 defines the terms, definitions and surface texture parameters used to determine profile-based surface texture. Published in December 2021, this first edition consolidates and updates earlier profile standards (e.g., ISO 4287, ISO 12085, ISO 13565 series) and aligns profile parameters with the ISO GPS matrix model. The document is focused on profile measurement methods and establishes a common vocabulary and parameter set for consistent specification, measurement and reporting.

Key topics and technical requirements

Terminology and definitions for profile surface texture, including general terms, geometrical parameters and feature terms.
Field parameters organized by type:
- Height parameters (e.g., arithmetic mean height, root mean square height, skewness, kurtosis, total height)
- Spatial parameters (e.g., autocorrelation length, dominant spatial wavelength)
- Hybrid parameters (e.g., root mean square gradient, developed length and ratios)
- Material ratio functions and related parameters, including material ratio curve and volume parameters
Feature parameters based on peak/pit characterization and profile-element segmentation (spacing, heights, counts).
Feature characterization methods and named feature parameters, including normative procedures for segmentation (crossing-the-line, watershed-related approaches noted as an update).
Normative and informative annexes providing calculation methods (derivatives, curvature), determination procedures (material ratio curve, stratified surfaces), segmentation and feature-characterization workflows, and a summary of parameters.
References to filtration and GPS concepts (ISO 16610-1, ISO 14638) and decision rules (ISO 8015, ISO 14253-1) to ensure consistent application.

Practical applications

Overview

Key topics and technical requirements

Terminology and definitions for profile surface texture, including general terms, geometrical parameters and feature terms.
Field parameters organized by type:
- Height parameters (e.g., arithmetic mean height, root mean square height, skewness, kurtosis, total height)
- Spatial parameters (e.g., autocorrelation length, dominant spatial wavelength)
- Hybrid parameters (e.g., root mean square gradient, developed length and ratios)
- Material ratio functions and related parameters, including material ratio curve and volume parameters
Feature parameters based on peak/pit characterization and profile-element segmentation (spacing, heights, counts).
Feature characterization methods and named feature parameters, including normative procedures for segmentation (crossing-the-line, watershed-related approaches noted as an update).
Normative and informative annexes providing calculation methods (derivatives, curvature), determination procedures (material ratio curve, stratified surfaces), segmentation and feature-characterization workflows, and a summary of parameters.
References to filtration and GPS concepts (ISO 16610-1, ISO 14638) and decision rules (ISO 8015, ISO 14253-1) to ensure consistent application.

ISO 21920-2:2021 PDF

Technical details

Abstract

Overview

Key topics and technical requirements

Practical applications

Abstract

Overview

Key topics and technical requirements

Practical applications

Who should use this standard

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