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KATO STI Thread Plug Gages

KATO STI (Screw Thread Insert) Thread Plug Gages 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 Gages" and "Reference Gages" are shown tabulated.  Working Gages are recommended for use with production since their greater tolerance allows for more wear.  Reference Gages have pitch diameters at or very close to basic sizes and are to be used as master gages.

Special Notes:

  • The Working Gage "GO" member has a 0.0002 wear allowance on the pitch diameter.
  • Gaging 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. 

 

Nominal
Thread
Size		 Working Gages Reference Gages
3B 2B 3B 2B
UNC - Unified Coarse
2-56 CGC-02X-3B CGC-02X-2B CGC-02W-3B CGC-02W-2B
3-48 CGC-03X-3B CGC-03X-3B CGC-03W-3B CGC-03W-2B
4-40 CGC-04X-3B CGC-04X-3B CGC-04W-3B CGC-04W-2B
5-40 CGC-05X-3B CGC-05X-3B CGC-05W-3B CGC-05W-2B
6-32 CGC-06X-3B CGC-06X-3B CGC-06W-3B CGC-06W-2B
8-32 CGC-2X-3B CGC-2X-3B CGC-2W-3B CGC-2W-2B
10-24 CGC-3X-3B CGC-3X-3B CGC-3W-3B CGC-3W-2B
12-24 CGC-1X-3B CGC-1X-3B CGC-1W-3B CGC-1W-2B
1/4-20 CGC-4X-3B CGC-4X-3B CGC-4W-3B CGC-4W-2B
5/16-18 CGC-5X-3B CGC-5X-3B CGC-5W-3B CGC-5W-2B
3/8-16 CGC-6X-3B CGC-6X-3B CGC-6W-3B CGC-6W-2B
7/16-14 CGC-7X-3B CGC-7X-3B CGC-7W-3B CGC-7W-2B
1/2-13 CGC-8X-3B CGC-8X-3B CGC-8W-3B CGC-8W-2B
UNF - Unified Fine
3-56 CGF-03X-3B CGF-03X-2B CGF-03W-3B CGF-03W-2B
4-48 CGF-04X-3B CGF-04X-2B CGF-04W-3B CGF-04W-2B
6-40 CGF-06X-3B CGF-06X-2B CGF-06W-3B CGF-06W-2B
8-36 CGF-2X-3B CGF-2X-2B CGF-2W-3B CGF-2W-2B
10-32 CGF-3X-3B CGF-3X-2B CGF-3W-3B CGF-3W-2B
1/4-28 CGF-4X-3B CGF-4X-2B CGF-4W-3B CGF-4W-2B
5/16-24 CGF-5X-3B CGF-5X-2B CGF-5W-3B CGF-5W-2B
3/8-24 CGF-6X-3B CGF-6X-2B CGF-6W-3B CGF-6W-2B
7/16-20 CGF-7X-3B CGF-7X-2B CGF-7W-3B CGF-7W-2B
1/2-20 CGF-8X-3B CGF-8X-2B CGF-8W-3B CGF-8W-2B
Nominal
Thread
Size		 Working Gages Reference Gages
4H 5H 4H 5H

Metric Coarse
M2.2X0.45 CGM-2.2X0.45-4H CGM-2.2X0.45-5H ----- -----
M2.5X0.45 CGM-2.5X0.45-4H CGM-2.5X0.45-5H ----- -----
M3X0.5 CGM-3X0.5-4H CGM-3X0.5-5H ----- -----
M3.5X0.6 CGM-3.5X0.6-4H CGM-3.5X0.6-5H ----- -----
M4X0.7 CGM-4X0.7-4H CGM-4X0.7-5H ----- -----
M5X0.8 CGM-5X0.8-4H CGM-5X0.8-5H ----- -----
M6X1 CGM-6X1-4H CGM-6X1-5H ----- -----
M7X1 CGM-7X1-4H CGM-7X1-5H ----- -----
M8X1.25 CGM-8X1.25-4H CGM-8X1.25-5H ----- -----
M10X1.5 CGM-10X1.5-4H CGM-10X1.5-5H ----- -----
M12X1.75 CGM-12X1.75-4H CGM-12X1.75-5H ----- -----
M14X2 CGM-14X2-4H CGM-14X2-5H ----- -----
M16X2* CGM-16X2-4H CGM-16X2-5H ----- -----
M18X2.5* CGM-18X2.5-4H CGM-18X2.5-5H ----- -----
M20X2.5* CGM-20X2.5-4H CGM-20X2.5-5H ----- -----

Metric Fine
M8X1 CGM-8X1-4H CGM-8X1-5H ----- -----
M10X1 CGM-10X1-4H CGM-10X1-5H ----- -----
M10X1.25 CGM-10X1.25-4H CGM-10X1.25-5H ----- -----
M12X1.25 CGM-12X1.25-4H CGM-12X1.25-5H ----- -----
M12X1.5 CGM-12X1.5-4H CGM-12X1.5-5H ----- -----
M14X1.5 CGM-14X1.5-4H CGM-14X1.5-5H ----- -----
M16X1.5* CGM-16X1.5-4H CGM-16X1.5-5H ----- -----
M18X1.5* CGM-18X1.5-4H CGM-18X1.5-5H ----- -----
M20X1.5* CGM-20X1.5-4H CGM-20X1.5-5H ----- -----

* Items are non-stocked items, and may require special orders with minimum requirements, and longer than average lead times.

For sizes larger than 1/2" or M20, and for Metric Reference Gages please consult factory.

For additional technical data on KATO STI Gages visit the Tech Info Page.