Giano, J., Abu, R. and Mukhnizar, M. 2025. Analysis of the Tempering Process Results with Temperature Variations on the Mechanical Properties of AISI 4340 Material Hardness. TOFEDU: The Future of Education Journal. 4, 8 (Dec. 2025), 4814–4820. DOI:https://doi.org/10.61445/tofedu.v4i8.1182.