Abstract: A superhigh torsional strength, metallic and airtight drillrod coupler including an externally threaded coupler having a radially outward outer shoulder at an end thereof in an axial direction, an inner end face at the other end thereof in the axial direction, and a first sealing face being provided in sequence in the axial direction of the externally threaded coupler. The coupler further includes an internally threaded coupler to be threadedly connected to the externally threaded coupler, the internally threaded coupler having a radially inward inner shoulder at an end thereof in an axial direction, and an outer end face at the other end thereof in the axial direction, with a second sealing face. Further, the first sealing face and the second sealing face are both sloped faces, and are in an interference-fit sealed connection with each other.

Abstract: The present invention discloses a superhigh torsional strength, metallic and airtight drillrod coupler, which comprises: an externally threaded coupler, which has a radially outward outer shoulder at an end thereof in an axial direction and an inner end face at the other end thereof in the axial direction, with an externally threaded section and a first sealing face being provided in sequence in the axial direction of the externally threaded coupler from the outer shoulder to the inner end face; and an internally threaded coupler to be threadedly connected to said externally threaded coupler, the internally threaded coupler having a radially inward inner shoulder at an end thereof in an axial direction and an outer end face at the other end thereof in the axial direction, with a second sealing face and an internally threaded section to be engaged with the externally threaded section being provided in sequence in the axial direction of the internally threaded coupler from the inner shoulder to the outer end fa