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Special Notes:

  • The "H" limit number (last digit in the Part Numbers below) indicates the number of 0.0005 inch increments the tap's maximum diameter is above the basic (minimum)
  • The Class of Fit specifies the pitch diameter tolerance of the tapped hole, with 3B (4H for metric) being the tighter range usually specified in military & aerospace applications, and when consistent locking torque is desired when using KATO locking CoilThread Inserts.  Class 2B (5H for metric) taps provide a broader tolerance range or looser fit, and are normally specified in commercial & industrial applications. The class of fit of the installed insert is controlled by the class of fit of the tap.

 

STI Tap Part Numbers

Nominal
Thread
Size

                      Standard Regular Finishing
Plug Bottoming
3B 2B 3B 2B

UNC - UNIFIED COARSE
2-56 CTC-02SRP-H1 CTC-02SRP-H2 CTC-02SRB-H1 CTC-02SRB-H2
3-48 CTC-03SRP-H1 CTC-03SRP-H2 CTC-03SRB-H1 CTC-03SRB-H2
4-40 CTC-04SRP-H1 CTC-04SRP-H2 CTC-04SRB-H1 CTC-04SRB-H2
5-40 CTC-05SRP-H1 CTC-05SRP-H2 CTC-05SRB-H1 CTC-05SRB-H2
6-32 CTC-06SRP-H2 CTC-06SRP-H3 CTC-06SRB-H2 CTC-06SRB-H3
8-32 CTC-2SRP-H2 CTC-2SRP-H3 CTC-2SRB-H2 CTC-2SRB-H3
10-24 CTC-3SRP-H2 CTC-3SRP-H3 CTC-3SRB-H2 CTC-3SRB-H3
12-24 CTC-1SRP-H2 CTC-1SRP-H3 CTC-1SRB-H2 CTC-1SRB-H3
1/4-20 CTC-4SRP-H2 CTC-4SRP-H3 CTC-4SRB-H2 CTC-4SRB-H3
5/16-18 CTC-5SRP-H2 CTC-5SRP-H3 CTC-5SRB-H2 CTC-5SRB-H3
3/8-16 CTC-6SRP-H3 CTC-6SRP-H4 CTC-6SRB-H3 CTC-6SRB-H4
7/16-14 CTC-7SRP-H3 CTC-7SRP-H4 CTC-7SRB-H3 CTC-7SRB-H4
1/2-13 CTC-8SRP-H3 CTC-8SRP-H4 CTC-8SRB-H3 CTC-8SRB-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

UNF - UNIFIED FINE
3-56 CTF-03SRP-H1 CTF-03SRP-H2 CTF-03SRB-H1 CTF-03SRB-H2
4-48 CTF-04SRP-H1 CTF-04SRP-H2 CTF-04SRB-H1 CTF-04SRB-H2
6-40 CTF-06SRP-H1 CTF-06SRP-H2 CTF-06SRB-H1 CTF-06SRB-H2
8-36 CTF-2SRP-H1 CTF-2SRP-H2 CTF-2SRB-H1 CTF-2SRB-H2
10-32 CTF-3SRP-H2 CTF-3SRP-H3 CTF-3SRB-H2 CTF-3SRB-H3
1/4-28 CTF-4SRP-H2 CTF-4SRP-H3 CTF-4SRB-H2 CTF-4SRB-H3
5/16-24 CTF-5SRP-H2 CTF-5SRP-H3 CTF-5SRB-H2 CTF-5SRB-H3
3/8-24 CTF-6SRP-H2 CTF-6SRP-H3 CTF-6SRB-H2 CTF-6SRB-H3
7/16-20 CTF-7SRP-H3 CTF-7SRP-H4 CTF-7SRB-H3 CTF-7SRB-H4
1/2-20 CTF-8SRP-H3 CTF-8SRP-H4 CTF-8SRB-H3 CTF-8SRB-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
 
Nominal
Thread
Size		           Spiral Pointed           Spiral Flute
Plug Bottoming
3B 2B 3B 2B
UNC - UNIFIED COARSE
2-56 CTC-02SPP-H1 CTC-02SPP-H2 CTC-02SFB-H1 CTC-02SFB-H2
3-48 CTC-03SPP-H1 CTC-03SPP-H2 CTC-03SFB-H1 CTC-03SFB-H2
4-40 CTC-04SPP-H1 CTC-04SPP-H2 CTC-04SFB-H1 CTC-04SFB-H2
5-40 CTC-05SPP-H1 CTC-05SPP-H2 CTC-05SFB-H1 CTC-05SFB-H2
6-32 CTC-06SPP-H2 CTC-06SPP-H3 CTC-06SFB-H2 CTC-06SFB-H3
8-32 CTC-2SPP-H2 CTC-2SPP-H3 CTC-2SFB-H2 CTC-2SFB-H3
10-24 CTC-3SPP-H2 CTC-3SPP-H3 CTC-3SFB-H2 CTC-3SFB-H3
12-24 CTC-1SPP-H2 CTC-1SPP-H3 CTC-1SFB-H2 CTC-1SFB-H3
1/4-20 CTC-4SPP-H2 CTC-4SPP-H3 CTC-4SFB-H2 CTC-4SFB-H3
5/16-18 CTC-5SPP-H2 CTC-5SPP-H3 CTC-5SFB-H2 CTC-5SFB-H3
3/8-16 CTC-6SPP-H3 CTC-6SPP-H4 CTC-6SFB-H3 CTC-6SFB-H4
7/16-14 CTC-7SPP-H3 CTC-7SPP-H4 CTC-7SFB-H3 CTC-7SFB-H4
1/2-13 CTC-8SPP-H3 CTC-8SPP-H4 CTC-8SFB-H3 CTC-8SFB-H4
9/16-12 N/A N/A N/A N/A
5/8-11 N/A N/A N/A N/A
3/4-10 N/A N/A N/A N/A
7/8-9 N/A N/A N/A N/A
1-8 N/A N/A N/A N/A
UNF - UNIFIED FINE
3-56 CTF-03SPP-H1 CTF-03SPP-H2 CTF-03SFB-H1 CTF-03SFB-H2
4-48 CTF-04SPP-H1 CTF-04SPP-H2 CTF-04SFB-H1 CTF-04SFB-H2
6-40 CTF-06SPP-H1 CTF-06SPP-H2 CTF-06SFB-H1 CTF-06SFB-H2
8-36 CTF-2SPP-H1 CTF-2SPP-H2 CTF-2SFB-H1 CTF-2SFB-H2
10-32 CTF-3SPP-H2 CTF-3SPP-H3 CTF-3SFB-H2 CTF-3SFB-H3
1/4-28 CTF-4SPP-H2 CTF-4SPP-H3 CTF-4SFB-H2 CTF-4SFB-H3
5/16-24 CTF-5SPP-H2 CTF-5SPP-H3 CTF-5SFB-H2 CTF-5SFB-H3
3/8-24 CTF-6SPP-H2 CTF-6SPP-H3 CTF-6SFB-H2 CTF-6SFB-H3
7/16-20 CTF-7SPP-H3 CTF-7SPP-H4 CTF-7SFB-H3 CTF-7SFB-H4
1/2-20 CTF-8SPP-H3 CTF-8SPP-H4 CTF-8SFB-H3 CTF-8SFB-H4
9/16-18 N/A N/A N/A N/A
5/8-18 N/A N/A N/A N/A
3/4-16 N/A N/A N/A N/A
7/8-14 N/A N/A N/A N/A
1-12 N/A N/A N/A N/A
 
Nominal
Thread
Size		 Standard Regular Finishing
Plug Bottoming
4H 5H 4H 5H
METRIC COARSE
M2.2X0.45 CTM-2.2X.45SRP-4H CTM-2.2X.45SRP-5H CTM-2.2X.45SRB-4H CTM-2.2X.45SRB-5H
M2.5X0.45 CTM-2.5X.45SRP-4H CTM-2.5X.45SRP-5H CTM-2.5X.45SRB-4H CTM-2.5X.45SRB-5H
M3X0.5 CTM-3X.5SRP-4H CTM-3X.5SRP-5H CTM-3X.5SRB-4H CTM-3X.5SRB-5H
M3.5X0.6 CTM-3.5X.6SRP-4H CTM-3.5X.6SRP-5H CTM-3.5X.6SRB-4H CTM-3.5X.6SRB-5H
M4X0.7 CTM-4X.7SRP-4H CTM-4X.7SRP-5H CTM-4X.7SRB-4H CTM-4X.7SRB-5H
M5X0.8 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-4H
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
 
Nominal
Thread
Size		 Spiral Pointed Spiral Flute
Plug Bottoming
4H 5H 4H 5H
METRIC COARSE
M2.2X0.45 CTM-2.2X.45SPP-4H CTM-2.2X.45SPP-5H N/A N/A
M2.5X0.45 CTM-2.5X.45SPP-4H CTM-2.5X.45SPP-5H N/A N/A
M3X0.5 CTM-3X.5SPP-4H CTM-3X.5SPP-5H N/A N/A
M3.5X0.6 CTM-3.5X.6SPP-4H CTM-3.5X.6SPP-5H N/A N/A
M4X0.7 CTM-4X.7SPP-4H CTM-4X.7SPP-5H N/A N/A
M5X0.8 CTM-5X.8SPP-4H CTM-5X.8SPP-5H N/A N/A
M6X1 CTM-6X1SPP-4H CTM-6X1SPP-5H N/A N/A
M7X1 CTM-7X1SPP-4H CTM-7X1SPP-5H N/A N/A
M8X1.25 CTM-8X1.25SPP-4H CTM-8X1.25SPP-5H N/A N/A
M10X1.5 CTM-10X1.5SPP-4H CTM-10X1.5SPP-5H N/A N/A
M12X1.75 CTM-12X1.75SPP-4H CTM-12X1.75SPP-5H N/A N/A
M14X2* CTM-14X2SPP-4H CTM-14X2SPP-5H N/A N/A
M16X2* CTM-16X2SPP-4H CTM-16X2SPP-5H N/A N/A
M18X2.5* CTM-18X2.5SPP-4H CTM-18X2.5SPP-5H N/A N/A
M20X2.5* CTM-20X2.5SPP-4H CTM-20X2.5SPP-5H N/A N/A
M22X2.5* CTM-22X2.5SPP-4H CTM-22X2.5SPP-5H N/A N/A
M24X3* CTM-24X3SPP-4H CTM-24X3SPP-5H N/A N/A
METRIC FINE
M8X1 CTM-8X1SPP-4H CTM-8X1SPP-5H N/A N/A
M10X1 CTM-10X1SPP-4H CTM-10X1SPP-5H N/A N/A
M10X1.25 CTM-10X1.25SPP-4H CTM-10X1.25SPP-5H N/A N/A
M12X1.25 CTM-12X1.25SPP-4H CTM-12X1.25SPP-5H N/A N/A
M12X1.5 CTM-12X1.5SPP-4H CTM-12X1.5SPP-5H N/A N/A
M14X1.5* CTM-14X1.5SPP-4H CTM-14X1.5SPP-5H N/A N/A
M16X1.5* CTM-16X1.5SPP-4H CTM-16X1.5SPP-5H N/A N/A
M18X1.5* CTM-18X1.5SPP-4H CTM-18X1.5SPP-5H N/A N/A
M20X1.5* CTM-20X1.5SPP-4H CTM-20X1.5SPP-5H N/A N/A
M22X1.5* CTM-22X1.5SPP-4H CTM-22X1.5SPP-5H N/A N/A
M18X2* CTM-18X2SPP-4H CTM-18X2SPP-5H N/A N/A
M20X2* CTM-20X2SPP-4H CTM-20X2SPP-5H N/A N/A
M22X2* CTM-22X2SPP-4H CTM-22X2SPP-5H N/A N/A
M24X2* CTM-24X2SPP-4H CTM-24X2SPP-5H N/A N/A

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

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