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The thread precision is and turns on lathe by the thread tolerance zone gathers the weight thread quality overall target which the length is composed together.

The thread tolerance zone code number with goes against the diameter tolerance zone code number including the pitch diameter tolerance zone.

The tolerance zone code number is by expressed that its size's grade of tolerance digit and expressed its position's letter composes. If 6H,6g and so on.

Thread tolerance zone code number labelling after thread code number, middle with - separates.

If the thread pitch diameter tolerance zone with goes against the diameter tolerance zone code number to be different, then the distinction note leaves. The former expression pitch diameter tolerance zone, the latter expression goes against the diameter tolerance zone.

If the thread pitch diameter tolerance zone with goes against the diameter tolerance zone code number to be the same, then only pours a code number.