Unc是美制粗牙螺纹，牙型60° unf是美制细牙螺纹，牙型60° npt是美制锥 管螺纹，牙型60° nps是美制平行管螺纹，牙型60° 英寸制统一螺纹，在英寸制国家广泛采用，该类螺纹分三个.
Breaking Down UNC's 2023 Football Schedule Tar Heel Times 7/31/2023
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