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Part Numbers

For fast and accurate part numbers and technical information on specific inserts try out the KATO Product Wizard.

Example of a KATO CoilThread Tap part number:

Example

Tool Type1
Thread Designation2 Size Designation3 Style / Type 4 Class of Fit5
CT - CoilThread Tap (STI) C - Unified Coarse Chart Below SRP - Standard Regular Plug See notes at the bottom
F - Unified Fine SRB - Standard Regular Bottoming  
M - Metric SPP - Spiral Point Plug  
SFB - Spiral Flute Bottoming  

KATO STI Taps (CT) Part Numbers

Thread
Size
Standard Regular Finishing Spiral Pointed Spiral Flute
Plug Bottoming Plug Bottoming
3B 2B 3B 2B 3B 2B 3B 2B
Unified Coarse
2-56 CTC-02SRP-H1 CTC-02SRP-H2 CTC-02SRB-H1 CTC-02SRB-H2 CTC-02SPP-H1 CTC-02SPP-H2 CTC-02SFB-H1 CTC-02SFB-H2
3-48 CTC-03SRP-H1 CTC-03SRP-H2 CTC-03SRB-H1 CTC-03SRB-H2 CTC-03SPP-H1 CTC-03SPP-H2 CTC-03SFB-H1 CTC-03SFB-H2
4-40 CTC-04SRP-H1 CTC-04SRP-H2 CTC-04SRB-H1 CTC-04SRB-H2 CTC-04SPP-H1 CTC-04SPP-H2 CTC-04SFB-H1 CTC-04SFB-H2
5-40 CTC-05SRP-H1 CTC-05SRP-H2 CTC-05SRB-H1 CTC-05SRB-H2 CTC-05SPP-H1 CTC-05SPP-H2 CTC-05SFB-H1 CTC-05SFB-H2
6-32 CTC-06SRP-H2 CTC-06SRP-H3 CTC-06SRB-H2 CTC-06SRB-H3 CTC-06SPP-H2 CTC-06SPP-H3 CTC-06SFB-H2 CTC-06SFB-H3
8-32 CTC-2SRP-H2 CTC-2SRP-H3 CTC-2SRB-H2 CTC-2SRB-H3 CTC-2SPP-H2 CTC-2SPP-H3 CTC-2SFB-H2 CTC-2SFB-H3
10-24 CTC-3SRP-H2 CTC-3SRP-H3 CTC-3SRB-H2 CTC-3SRB-H3 CTC-3SPP-H2 CTC-3SPP-H3 CTC-3SFB-H2 CTC-3SFB-H3
12-24 CTC-1SRP-H2 CTC-1SRP-H3 CTC-1SRB-H2 CTC-1SRB-H3 CTC-1SPP-H2 CTC-1SPP-H3 CTC-1SFB-H2 CTC-1SFB-H3
1/4-20 CTC-4SRP-H2 CTC-4SRP-H3 CTC-4SRB-H2 CTC-4SRB-H3 CTC-4SPP-H2 CTC-4SPP-H3 CTC-4SFB-H2 CTC-4SFB-H3
5/16-18 CTC-5SRP-H3 CTC-5SRP-H4 CTC-5SRB-H3 CTC-5SRB-H4 CTC-5SPP-H3 CTC-5SPP-H4 CTC-5SFB-H3 CTC-5SFB-H4
3/8-16 CTC-6SRP-H3 CTC-6SRP-H4 CTC-6SRB-H3 CTC-6SRB-H4 CTC-6SPP-H3 CTC-6SPP-H4 CTC-6SFB-H3 CTC-6SFB-H4
7/16-14 CTC-7SRP-H3 CTC-7SRP-H4 CTC-7SRB-H3 CTC-7SRB-H4 CTC-7SPP-H3 CTC-7SPP-H4 CTC-7SFB-H3 CTC-7SFB-H4
1/2-13 CTC-8SRP-H3 CTC-8SRP-H4 CTC-8SRB-H3 CTC-8SRB-H4 CTC-8SPP-H3 CTC-8SPP-H4 CTC-8SFB-H3 CTC-8SFB-H4
9/16-12 CTC-9SRP-H3 CTC-9SRP-H4 CTC-9SRB-H3 CTC-9SRB-H4 --- --- --- ---
5/8-11 CTC-10SRP-H3 CTC-10SRP-H4 CTC-10SRB-H3 CTC-10SRB-H4 --- --- --- ---
3/4-10 CTC-12SRP-H3 CTC-12SRP-H5 CTC-12SRB-H3 CTC-12SRB-H5 --- --- --- ---
7/8-9 CTC-14SRP-H3 CTC-14SRP-H5 CTC-14SRB-H3 CTC-14SRB-H5 --- --- --- ---
1-8 CTC-16SRP-H4 CTC-16SRP-H6 CTC-16SRB-H4 CTC-16SRB-H6 --- --- --- ---
Unified Fine
0-80 CTF-00SRP-H1 CTF-00SRP-H2 CTF-00SRB-H1 CTF-00SRB-H2 --- --- --- ---
3-56 CTF-03SRP-H1 CTF-03SRP-H2 CTF-03SRB-H1 CTF-03SRB-H2 CTF-03SPP-H1 CTF-03SPP-H2 CTF-03SFB-H1 CTF-03SFB-H2
4-48 CTF-04SRP-H1 CTF-04SRP-H2 CTF-04SRB-H1 CTF-04SRB-H2 CTF-04SPP-H1 CTF-04SPP-H2 CTF-04SFB-H1 CTF-04SFB-H2
6-40 CTF-06SRP-H1 CTF-06SRP-H2 CTF-06SRB-H1 CTF-06SRB-H2 CTF-06SPP-H1 CTF-06SPP-H2 CTF-06SFB-H1 CTF-06SFB-H2
8-36 CTF-2SRP-H1 CTF-2SRP-H2 CTF-2SRB-H1 CTF-2SRB-H2 CTF-2SPP-H1 CTF-2SPP-H2 CTF-2SFB-H1 CTF-2SFB-H2
10-32 CTF-3SRP-H2 CTF-3SRP-H3 CTF-3SRB-H2 CTF-3SRB-H3 CTF-3SPP-H2 CTF-3SPP-H3 CTF-3SFB-H2 CTF-3SFB-H3
1/4-28 CTF-4SRP-H2 CTF-4SRP-H3 CTF-4SRB-H2 CTF-4SRB-H3 CTF-4SPP-H2 CTF-4SPP-H3 CTF-4SFB-H2 CTF-4SFB-H3
5/16-24 CTF-5SRP-H2 CTF-5SRP-H3 CTF-5SRB-H2 CTF-5SRB-H3 CTF-5SPP-H2 CTF-5SPP-H3 CTF-5SFB-H2 CTF-5SFB-H3
3/8-24 CTF-6SRP-H2 CTF-6SRP-H3 CTF-6SRB-H2 CTF-6SRB-H3 CTF-6SPP-H2 CTF-6SPP-H3 CTF-6SFB-H2 CTF-6SFB-H3
7/16-20 CTF-7SRP-H3 CTF-7SRP-H4 CTF-7SRB-H3 CTF-7SRB-H4 CTF-7SPP-H3 CTF-7SPP-H4 CTF-7SFB-H3 CTF-7SFB-H4
1/2-20 CTF-8SRP-H3 CTF-8SRP-H4 CTF-8SRB-H3 CTF-8SRB-H4 CTF-8SPP-H3 CTF-8SPP-H4 CTF-8SFB-H3 CTF-8SFB-H4
9/16-18 CTF-9SRP-H3 CTF-9SRP-H4 CTF-9SRB-H3 CTF-9SRB-H4 --- --- --- ---
5/8-18 CTF-10SRP-H3 CTF-10SRP-H4 CTF-10SRB-H3 CTF-10SRB-H4 --- --- --- ---
3/4-16 CTF-12SRP-H3 CTF-12SRP-H4 CTF-12SRB-H3 CTF-12SRB-H4 --- --- --- ---
7/8-14 CTF-14SRP-H3 CTF-14SRP-H4 CTF-14SRB-H3 CTF-14SRB-H4 --- --- --- ---
1-12 CTF-16SRP-H4 CTF-16SRP-H6 CTF-16SRB-H4 CTF-16SRB-H6 --- --- --- ---


Thread
Size
Standard Regular Finishing
Plug Bottoming
4H 5H 4H 5H
Metric Coarse
M2.X4 CTM-2X.4SRP-4H CTM-2X.4SRP-5H CTM-2X.4SRB-4H CTM-2X.4SRB-5H
M2.2X.45 CTM-2.2X.45SRP-4H CTM-2.2X.45SRP-5H CTM-2.2X.45SRB-4H CTM-2.2X.45SRB-5H
M2.5X.45 CTM-2.5X.45SRP-4H CTM-2.5X.45SRP-5H CTM-2.5X.45SRB-4H CTM-2.5X.45SRB-5H
M3X.5 CTM-3X.5SRP-4H CTM-3X.5SRP-5H CTM-3X.5SRB-4H CTM-3X.5SRB-5H
M3.5X.6 CTM-3.5X.6SRP-4H CTM-3.5X.6SRP-5H CTM-3.5X.6SRB-4H CTM-3.5X.6SRB-5H
M4X.7 CTM-4X.7SRP-4H CTM-4X.7SRP-5H CTM-4X.7SRB-4H CTM-4X.7SRB-5H
M5X.8 CTM-5X.8SRP-4H CTM-5X.8SRP-5H CTM-5X.8SRB-4H CTM-5X.8SRB-5H
M6X1 CTM-6X1SRP-4H CTM-6X1SRP-5H CTM-6X1SRB-4H CTM-6X1SRB-5H
M7X1 CTM-7X1SRP-4H CTM-7X1SRP-5H CTM-7X1SRB-4H CTM-7X1SRB-5H
M8X1.25 CTM-8X1.25SRP-4H CTM-8X1.25SRP-5H CTM-8X1.25SRB-4H CTM-8X1.25SRB-5H
M10X1.5 CTM-10X1.5SRP-4H CTM-10X1.5SRP-5H CTM-10X1.5SRB-4H CTM-10X1.5SRB-5H
M12X1.75 CTM-12X1.75SRP-4H CTM-12X1.75SRP-5H CTM-12X1.75SRB-4H CTM-12X1.75SRB-5H
M14X2 CTM-14X2SRP-4H CTM-14X2SRP-5H CTM-14X2SRB-4H CTM-14X2SRB-5H
M16X2 CTM-16X2SRP-4H CTM-16X2SRP-5H CTM-16X2SRB-4H CTM-16X2SRB-5H
M18X2.5 CTM-18X2.5SRP-4H CTM-18X2.5SRP-5H CTM-18X2.5SRB-4H CTM-18X2.5SRB-5H
M20X2.5 CTM-20X2.5SRP-4H CTM-20X2.5SRP-5H CTM-20X2.5SRB-4H CTM-20X2.5SRB-5H
M22X2.5 CTM-22X2.5SRP-4H CTM-22X2.5SRP-5H CTM-22X2.5SRB-4H CTM-22X2.5SRB-5H
M24X3 CTM-24X3SRP-4H CTM-24X3SRP-5H CTM-24X3SRB-4H CTM-24X3SRB-5H
Metric Fine
M8X1 CTM-8X1SRP-4H CTM-8X1SRP-5H CTM-8X1SRB-4H CTM-8X1SRB-5H
M10X1 CTM-10X1SRP-4H CTM-10X1SRP-5H CTM-10X1SRB-4H CTM-10X1SRB-5H
M10X1.25 CTM-10X1.25SRP-4H CTM-10X1.25SRP-5H CTM-10X1.25SRB-4H CTM-10X1.25SRB-5H
M12X1.25 CTM-12X1.25SRP-4H CTM-12X1.25SRP-5H CTM-12X1.25SRB-4H CTM-12X1.25SRB-5H
M12X1.5 CTM-12X1.5SRP-4H CTM-12X1.5SRP-5H CTM-12X1.5SRB-4H CTM-12X1.5SRB-5H
M14X1.5 CTM-14X1.5SRP-4H CTM-14X1.5SRP-5H CTM-14X1.5SRB-4H CTM-14X1.5SRB-5H
M16X1.5 CTM-16X1.5SRP-4H CTM-16X1.5SRP-5H CTM-16X1.5SRB-4H CTM-16X1.5SRB-5H
M18X1.5 CTM-18X1.5SRP-4H CTM-18X1.5SRP-5H CTM-18X1.5SRB-4H CTM-18X1.5SRB-5H
M20X1.5 CTM-20X1.5SRP-4H CTM-20X1.5SRP-5H CTM-20X1.5SRB-4H CTM-20X1.5SRB-5H
M22X1.5 CTM-22X1.5SRP-4H CTM-22X1.5SRP-5H CTM-22X1.5SRB-4H CTM-22X1.5SRB-5H
M18X2 CTM-18X2SRP-4H CTM-18X2SRP-5H CTM-18X2SRB-4H CTM-18X2SRB-5H
M20X2 CTM-20X2SRP-4H CTM-20X2SRP-5H CTM-20X2SRB-4H CTM-20X2SRB-5H
M22X2 CTM-22X2SRP-4H CTM-22X2SRP-5H CTM-22X2SRB-4H CTM-22X2SRB-5H
M24X2 CTM-24X2SRP-4H CTM-24X2SRP-5H CTM-24X2SRB-4H CTM-24X2SRB-5H


Thread
Size
Spiral Pointed Spiral Flute
Plug Bottoming
4H 5H 4H 5H
Metric Coarse
M2.X4 CTM-2XSPP-4H CTM-2X.4SPP-5H CTM-2X.4SFB-4H CTM-2X.4SFB-5H
M2.2X.45 CTM-2.2X.45SPP-4H CTM-2.2X.45SPP-5H CTM-2.2X.45SFB-4H CTM-2.2X.45SFB-5H
M2.5X.45 CTM-2.5X.45SPP-4H CTM-2.5X.45SPP-5H CTM-2.5X.45SFB-4H CTM-2.5X.45SFB-5H
M3X.5 CTM-3X.5SPP-4H CTM-3X.5SPP-5H CTM-3X.5SFB-4H CTM-3X.5SFB-5H
M3.5X.6 CTM-3.5X.6SPP-4H CTM-3.5X.6SPP-5H CTM-3.5X.6SFB-4H CTM-3.5X.6SFB-5H
M4X.7 CTM-4X.7SPP-4H CTM-4X.7SPP-5H CTM-4X.7SFB-4H CTM-4X.7SFB-5H
M5X.8 CTM-5X.8SPP-4H CTM-5X.8SPP-5H CTM-5X.8SFB-4H CTM-5X.8SFB-5H
M6X1 CTM-6X1SPP-4H CTM-6X1SPP-5H CTM-6X1SFB-4H CTM-6X1SFB-5H
M7X1 CTM-7X1SPP-4H CTM-7X1SPP-5H CTM-7X1SFB-4H CTM-7X1SFB-5H
M8X1.25 CTM-8X1.25SPP-4H CTM-8X1.25SPP-5H CTM-8X1.25SFB-4H CTM-8X1.25SFB-5H
M10X1.5 CTM-10X1.5SPP-4H CTM-10X1.5SPP-5H CTM-10X1.5SFB-4H CTM-10X1.5SFB-5H
M12X1.75 CTM-12X1.75SPP-4H CTM-12X1.75SPP-5H CTM-12X1.75SFB-4H CTM-12X1.75SFB-5H
M14X2 --- --- --- ---
M16X2 --- --- --- ---
M18X2.5 --- --- --- ---
M20X2.5 --- --- --- ---
M22X2.5 --- --- --- ---
M24X3 --- --- --- ---
Metric Fine
M8X1 CTM-8X1SPP-4H CTM-8X1SPP-5H CTM-8X1SFB-4H CTM-8X1SFB-5H
M10X1 CTM-10X1SPP-4H CTM-10X1SPP-5H CTM-10X1SFB-4H CTM-10X1SFB-5H
M10X1.25 CTM-10X1.25SPP-4H CTM-10X1.25SPP-5H CTM-10X1.25SFB-4H CTM-10X1.25SFB-5H
M12X1.25 CTM-12X1.25SPP-4H CTM-12X1.25SPP-5H CTM-12X1.25SFB-4H CTM-12X1.25SFB-5H
M12X1.5 CTM-12X1.5SPP-4H CTM-12X1.5SPP-5H CTM-12X1.5SFB-4H CTM-12X1.5SFB-5H
M14X1.5 --- --- --- ---
M16X1.5 --- --- --- ---
M18X1.5 --- --- --- ---
M20X1.5 --- --- --- ---
M22X1.5 --- --- --- ---
M18X2 --- --- --- ---
M20X2 --- --- --- ---
M22X2 --- --- --- ---
M24X2 --- --- --- ---

Notes:

  • The "H" limit number (last digit in part numbers above) indicates the number of .0005 inch increments the tap's maximum pitch diameter is above the basic (minimum).
  • The Class of Fit specifies the pitch diameter tolerance of the tapped hole, with class 3B (Unified) and 4H (Metric) being the tighter range usually specified in military/aerospace applications. Class 2B (Unified) and 5H (Metric) taps provide a broader tolerance range or looser fit, and are normally specified in commerical/industrial applications.
  • The Class of Fit of the installed insert is controlled by the Class of Fit of the tapped hole.

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