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i. S. Aftanaziv1, Dr. Sc. (Tech.), Prof., orcid.org/0000-0003-3484-7966, L. i. Shevchuk1, Dr. Sc. (Tech.), Assoc. Prof., orcid.org/0000-0001-6274-0256, O. i. Strohan1, cand. Sc. (Tech.), orcid.org/0000-0002-1790-6736, A. M. Kuk1, cand. Sc. (Tech.), Assoc. Prof., orcid.org/0000-0001-9145-243X, i. L. Samsin2, Dr. Sc. (jurid.), Prof., orcid.org/0000-0003-4118-8452 1 – Lviv Polytechnic National University, Lviv, Ukraine e­mail: ivan.aftanaziv@gmail.com 2 – Khmelnytskyi University of Management and Law, Khmelnytskyi, Ukraine, e­mail: Sam.kiev.ua@gmail.com

Improving reliability of drill pipe by strengthening of thread connections of its elements