Thread setting plugs are to be used to set ring gages only. Their purpose is setting or re-setting the ring gages and determining if the ring is within tolerance. Setting plugs are not to be used to check the work piece.

    To insure the ring gage is still within its tolerance after being put into use, the setting plug gage, both GO and NOGO, should be used to verify accuracy. This also provides the gage user the capability to reset the ring gage as required. Generally, the setting plug is ordered at the same time as the thread ring gage and there could be a cost savings when ordering them together. Remember, the set plug gage is needed in the manufacturing and certification of the ring gage and they are matched to each other and meant to be a metal to metal fit. If not set together they most likely will not fit together without re-setting the ring gage.

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