Overview
EN ISO 13565-1:1997 (ISO 13565-1:1996) is a Geometrical Product Specification (GPS) standard that defines a filtering method and general measurement conditions for profile-based surface texture assessment of surfaces with stratified functional properties - i.e., a finely finished plateau interrupted by relatively deep valleys and minimal waviness. The standard’s filtering approach reduces valley-induced distortion of the reference line so that roughness parameters are more representative of the functional plateau.
Key topics and requirements
- Purpose: suppress the influence of deep valleys on the reference (mean) line so roughness parameters reflect the plateau surface.
- Filtering process (multi-stage):
- Preliminary filtering of the primary profile using a phase-correct filter per ISO 11562 to obtain a first mean line.
- Identify and remove valley portions that lie below that mean line by replacing those segments with the mean-line curve.
- Apply the same filter again to the valley-suppressed profile to obtain the reference line.
- Transfer the reference line back to the original primary profile and compute the roughness profile as the difference.
- Measurement conditions:
- Use an instrument with an external reference where possible; mandatory for arbitration.
- Traversing direction: perpendicular to the direction of lay unless otherwise specified.
- Cut-off wavelength selection:
- Preferred cut-off wavelength k = 0.8 mm; k = 2.5 mm permitted in justified exceptional cases and must be declared in specifications and test results.
- Table 1 of the standard provides the relationship between cut-off wavelength and evaluation length.
- Normative references: ISO 3274, ISO 4287, ISO 11562 (for instrument characteristics, terms/parameters, and filter metrology respectively).
Applications and users
- Practical use where surfaces exhibit plateau/valley morphology, e.g. cylinder liners, honed surfaces, bearings, and certain honed/ground components used in automotive, aerospace, and hydraulic systems.
- Typical users:
- Metrologists and laboratory technicians performing surface texture measurement.
- Quality engineers and inspection teams specifying acceptance criteria.
- Tribology and surface engineering specialists assessing wear and lubricant retention performance.
- Designers and manufacturing engineers defining functional surface requirements.
- Benefit: produces more reliable roughness metrics for stratified surfaces, improving functional assessment (wear, sealing, lubrication).
Related standards
- ISO 13565 series: Part 2 (material ratio curve characterization) and Part 3 (material probability curve characterization).
- ISO 11562 (phase-correct filters), ISO 3274 (contact instrument characteristics), ISO 4287 (terms and parameters).
Keywords: EN ISO 13565-1:1997, ISO 13565-1, surface texture, stratified functional properties, roughness profile, filtering, cut-off wavelength, phase-correct filter, metrology, cylinder liners.
