细牙螺纹 fine threads ; fine pitch thread ; [机] fine thread ; Swiss Screw-thread
粗牙螺纹 coarse thread ; coarse pitch thread ; fine pitch thread ; UNC
统一标准粗牙螺纹 [机] unified coarse thread ; UNC thread ; UNC ; unified national coarse thread
统一标准细牙螺纹 UNF thread ; unified fine thread ; unified national fine thread ; UnifiedFineThreadUNF
超细牙螺纹 extra-fine thread ; UNEF
公制细牙螺纹 metric fine thread ; fine metric thread
内圆牙螺纹 internal rope thread
特细牙螺纹 extra fine thread ; extra fine screw ; UNEF
美制粗牙螺纹 NC ; NC America National Coarse Thread ; nationalcoarsethreadNC
统一标准特细牙螺纹 UNEF thread
如果螺栓尺寸为M 27或以下，使用公制粗牙螺纹。
When bolt size are M27 and less, metric coarse screw threads shall be used.
介绍了常见的用于紧固联接英寸制螺纹和用于管道连接英寸制螺纹的牙形、配合和标识，以及管螺纹的密封特点。
The tooth shape, fit and mark of clamping connection and pipe connection inch threads commonly used are introduced and their seal features.
大径指过外螺纹牙顶或内螺纹牙底的圆柱面直径。
The root of the external thread or the crest of the inner thread .
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