KATO STI Thread Plug Gauges

KATO STI (Screw Thread Insert) Thread Plug Gauges are used to check the accuracy of the tapped hole.  If the tapped hole is correct, the finished thread will also be accurate when the inset is installed.  It is not necessary to gage the installed insert.  Please note that both "Working Gauges" and "Reference Gauges" are shown tabulated.  Working Gauges are recommended for use with production since their greater tolerance allows for more wear.  Reference Gauges have pitch diameters at or very close to basic sizes and are to be used as master gauges.

Special Notes:

• The Working Gauge "GO" member has a 0.0002 wear allowance on the pitch diameter.
• Gauging of the tapped thread is specified because a standard gage may not freely enter an installed insert.  The insert will seat itself once a bolt or screw is installed and tightened. (Reference MS33537)
• KATO STI Gages comply with MIL-T-21309.
• The "GO" member checks basic pitch diameters, major diameter minimum and lead.  The "HI" or "NOT-GO" member check maximum pitch diameter.  The Minor diameter must be checked separately with a graduated pin set, for example.