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. 2021 May 30;14(11):2960. doi: 10.3390/ma14112960

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© 2021 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).

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Changes in the value of the parameter Rz of steel pins for roughness group III (Rz = 17.54–19.55 μm): (a) tests performed in dry conditions, (b) tests performed with moist graphite rings.