ISO 21920-1:2021
Geometrical product specifications (GPS) — Surface texture: Profile — Part 1: Indication of surface texture
This document specifies the rules for indication of surface texture by profile methods in technical product documentation by means of graphical symbols.
This document does not cover population requirements.
NOTE See ISO 18391 for population (batch) specifications.
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Tolerance acceptance rules
4.1 General
4.2 Maximum tolerance acceptance rule
4.3 16 % tolerance acceptance rule
4.4 Median tolerance acceptance rule
5 Specification elements for indication of profile surface texture specifications
5.1 General
5.2 Mandatory indication to be explicitly specified
5.3 Optional indications to specify non-default or further requirements
6 Indication of profile surface texture
6.1 General
6.2 Graphical symbols
6.3 Minimal indication
6.3.1 General
6.3.2 Minimal indication for parameters with defined defaults
6.3.3 Minimal indication for parameters without defined defaults
6.4 Complete indication
6.4.1 General
6.4.2 Complete indication for evaluation length R-parameters
6.4.3 Complete indication for section length R-parameters
6.4.4 Complete indication for evaluation length P-parameters and W-parameters
6.4.5 Complete indication for section length P-parameters and W-parameters
7 Rules for indication of profile surface texture specifications
7.1 General
7.2 Graphical symbol for the indication of profile surface texture specifications
7.3 Profile surface texture parameter
7.4 Tolerance limit value of the profile surface texture parameter
7.5 Tolerance types
7.6 Tolerance acceptance rule
7.7 Profile S-filter type
7.8 Profile S-filter nesting index
7.9 Profile L-filter type (for R-parameter) or profile S-filter type (for W-parameter)
7.10 Profile L-filter nesting index (for R-parameter) or profile S-filter nesting index (for W-parameter)
7.11 Evaluation length
7.12 Section length
7.13 Number of sections
7.14 Profile F-operator association method and element
7.15 Profile F-operator nesting index
7.16 Method of profile extraction
7.17 Other requirements, OR(n)
7.18 Manufacturing process
7.19 Surface lay and direction of lay
7.20 Profile direction
7.21 Setting class, Scn
8 Position on technical product documentation
8.1 General
8.2 Position and orientation of the graphical symbol
9 Simplified and additional indications
9.1 Simplified indications
9.1.1 General
9.1.2 General tolerances
9.1.3 Indication by the graphical symbol combined with a letter
9.2 Restrictive specifications
9.3 Indication of identical specifications for a number of feature elements
9.4 Indication of surface lay and direction of lay
9.4.1 General
9.4.2 Indication of surface lay without a reference
9.4.3 Indication of surface lay and direction of lay relative to a workpiece feature
9.5 Indication of the profile direction
9.5.1 General
9.5.2 Indication of the profile direction relative to the predominant direction of the surface lay
9.5.3 Indication of the profile direction relative to a workpiece feature
9.6 Indication of bilateral surface profile tolerances
9.7 Indication of different requirements for several additional processes on one surface feature
Annex A (normative) Proportions and dimensions of graphical symbols
Annex B (normative) Filter symbols for profile surface texture
Annex C (normative) Symbols for association methods and association elements
Annex D (informative) Indications for unambiguous surface profile specification
Annex E (normative) Inspection procedure for the 16 % tolerance acceptance rule
Annex F (informative) Criteria for the use of the maximum tolerance acceptance rule as the default
Annex G (informative) New issues and changes to previous documents
Annex H (informative) Overview of profile and areal standards in the GPS matrix model
Annex I (informative) Relation to the GPS matrix model
Bibliography
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Tolerance acceptance rules
4.1 General
4.2 Maximum tolerance acceptance rule
4.3 16 % tolerance acceptance rule
4.4 Median tolerance acceptance rule
5 Specification elements for indication of profile surface texture specifications
5.1 General
5.2 Mandatory indication to be explicitly specified
5.3 Optional indications to specify non-default or further requirements
6 Indication of profile surface texture
6.1 General
6.2 Graphical symbols
6.3 Minimal indication
6.3.1 General
6.3.2 Minimal indication for parameters with defined defaults
6.3.3 Minimal indication for parameters without defined defaults
6.4 Complete indication
6.4.1 General
6.4.2 Complete indication for evaluation length R-parameters
6.4.3 Complete indication for section length R-parameters
6.4.4 Complete indication for evaluation length P-parameters and W-parameters
6.4.5 Complete indication for section length P-parameters and W-parameters
7 Rules for indication of profile surface texture specifications
7.1 General
7.2 Graphical symbol for the indication of profile surface texture specifications
7.3 Profile surface texture parameter
7.4 Tolerance limit value of the profile surface texture parameter
7.5 Tolerance types
7.6 Tolerance acceptance rule
7.7 Profile S-filter type
7.8 Profile S-filter nesting index
7.9 Profile L-filter type (for R-parameter) or profile S-filter type (for W-parameter)
7.10 Profile L-filter nesting index (for R-parameter) or profile S-filter nesting index (for W-parameter)
7.11 Evaluation length
7.12 Section length
7.13 Number of sections
7.14 Profile F-operator association method and element
7.15 Profile F-operator nesting index
7.16 Method of profile extraction
7.17 Other requirements, OR(n)
7.18 Manufacturing process
7.19 Surface lay and direction of lay
7.20 Profile direction
7.21 Setting class, Scn
8 Position on technical product documentation
8.1 General
8.2 Position and orientation of the graphical symbol
9 Simplified and additional indications
9.1 Simplified indications
9.1.1 General
9.1.2 General tolerances
9.1.3 Indication by the graphical symbol combined with a letter
9.2 Restrictive specifications
9.3 Indication of identical specifications for a number of feature elements
9.4 Indication of surface lay and direction of lay
9.4.1 General
9.4.2 Indication of surface lay without a reference
9.4.3 Indication of surface lay and direction of lay relative to a workpiece feature
9.5 Indication of the profile direction
9.5.1 General
9.5.2 Indication of the profile direction relative to the predominant direction of the surface lay
9.5.3 Indication of the profile direction relative to a workpiece feature
9.6 Indication of bilateral surface profile tolerances
9.7 Indication of different requirements for several additional processes on one surface feature
Annex A (normative) Proportions and dimensions of graphical symbols
Annex B (normative) Filter symbols for profile surface texture
Annex C (normative) Symbols for association methods and association elements
Annex D (informative) Indications for unambiguous surface profile specification
Annex E (normative) Inspection procedure for the 16 % tolerance acceptance rule
Annex F (informative) Criteria for the use of the maximum tolerance acceptance rule as the default
Annex G (informative) New issues and changes to previous documents
Annex H (informative) Overview of profile and areal standards in the GPS matrix model
Annex I (informative) Relation to the GPS matrix model
Bibliography