侧规系统：多个小直径辊轮的固定侧规。
Side guide system: with multiple roller wheels of small diameter.
功能指示螺纹规是为了检验通端的最大材料限度及大小及止端的有效直径限度及大小。
Functional Indicating Thread Gage for inspecting the maximum-material GO functional limit and size and the NOT GO functional diameter limit and size.
通径规的直径就是管子生产商所能够确保的每一管子说明书上的内径。
The drift diameter is the inside diameter (ID) that the pipe manufacturer guarantees per specifications.
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