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.
In setting an adjustable thread ring gage, the sealing compound
must be removed and the locking screw loosened. Turning the adjusting
screw to the right enlarges the ring so that it turns freely onto
the thread setting plug. Alternately adjusting the adjusting screw
and tightening the locking screw, until a firm fit on the threads
is achieved, is the proper method of assuring accurate adjustment.
More complete instructions.
A truncated setting plug of standard design will have the crest
of the thread truncated for half the length of the gage, unless
otherwise specified, giving a full-form portion and a truncated
portion. In setting thread ring gages to size, the truncated portion
controls the pitch diameter and the full-form portion assures that
the proper clearance is provided at the major diameter of the ring
gage. The use of the full-form portion along with the truncated
portion checks the flank angle of the thread gage.
This page is a modified page extracted from Dynamics of Gaging published by Regal-Beloit Corporation.The data is provided for general information only. The intention is to provide accurate information; regardless; errors may exist in the supplied information. If accuracy is critical, base your final decisions on the data provided in the root documents: ANSI/ASME B1.20.1; ANSI B1.20.5;and ANSI SAE AS71051 which are copyrighted documents. To purchase copies visit an Authorized Reseller.
Original Posting: 5/4/2005
Last Revision: 5/5/2016
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