Patent ID: 7475721

Claim:
An independent screwed wellhead and a drilling flange comprising, in combination: an annular wellhead body with a bottom end secured to a surface casing of a well, the annular wellhead body including a passageway with a top end having an upper abutment surface, a lower abutment surface and a lateral contact surface; a generally annular flange body having a top end that terminates in a top flange for supporting a blowout preventer, an axial passageway having a diameter at least as large as the passageway of the annular wellhead body, a bottom end having an annular shoulder on an outer surface of a sidewall thereof, and the outer surface of the bottom end including an upper abutment surface, a lower abutment surface and a lateral contact surface that respectively mate with the respective corresponding surfaces of the annular wellhead body to provide a metal-to-metal fluid seal between the annular wellhead body and the generally annular flange body; and a lockdown nut rotatably supported by the annular shoulder, the lockdown nut securing the generally annular flange body to the annular wellhead body.