Following an investigation undertaken by the publisher, we found that the submitting author falsified credentials for the paper’s coauthors, and the coauthors have not responded to our requests via their institutions to confirm their authorship. We hereby retract the paper. Reasonable effort should be made to remove references to the paper. All authors have been notified of the retraction, and we have kept a record of any responses received. Citation of Retraction Statement: ASTM International, “RETRACTION STATEMENT: Effect of Tool Pin Profile on Microstructure and Hardness of Magnesium Alloy Zk60/SiCp Surface Composites Fabricated by Friction Stir Processing,” Journal of Testing and Evaluation 54, no. 1 (January/February 2026), https://doi.org/10.1520/JTE20269990 Citation of Original Article: M. Vignesh Kumar, G. Padamanaban, and V. Balasubramanian, “Effect of Tool Pin Profile on Microstructure and Hardness of Magnesium Alloy Zk60/SiCp Surface Composites Fabricated by Friction Stir Processing,” Journal of Testing and Evaluation 47, no. 6 (November/December 2019): 4309–4319, https://doi.org/10.1520/JTE20180322