TS 6956 EN ISO 4287/A1

TS 6956 EN ISO 4287/A1 is Amendment 1 to the profile-method standard for surface texture terminology and parameters; in this amendment, the Peak count number concept is addressed. As an amendment, it does not stand alone as a full new requirements document, but updates or clarifies parts of the parent standard’s terminology and parameter framework.

Technical context of surface texture and the profile method

In Geometrical Product Specifications, surface texture describes the small-scale irregularities present on a real surface, including roughness and waviness components. The profile method characterises that surface through a measured cross-sectional profile in a given direction, which is widely used in metrology and product specification. Terms and parameters provide a consistent way to express the profile quantitatively and to compare surfaces produced by different manufacturing processes.

What peak count number represents

Peak count number is a parameter related to the number of peaks detected over a specified profile length. In general technical use, such a count helps describe not only average roughness but also how frequently local protrusions occur along the profile. That information can be relevant when interpreting friction, contact behaviour, lubricant retention, and similar surface functions, although the effect depends on the material, process, and service conditions.

This document belongs to the EN ISO 4287 family and serves as an amendment that complements the conceptual framework of the parent standard. Its practical value lies in supporting more consistent understanding of surface texture parameters and their correct use in measurement, technical documentation, and quality communication.