We carry a variety of CAT 40 end mill holders and CAT 50 end mill holders in metric and inch sizes. Also, find Morse Taper Holders, Jacob Taper Adapters, and Shell Mill Holders for CNC milling. CAT tools are also known as Caterpillar “V-flange”.
 
 
  | 
 
 
 | 
Part No. | 
D | 
D1 | 
L | 
L1 | 
Retention Knob Thread | 
 
| CAT 40 | 
STUB LENGTH 
Inch Sizes | 
SC40SE0500 
SC40SE0625 
SC40SE0750 
SC40SE1000 
SC40SE1250 | 
0.5000 
0.6250 
0.7500 
1.0000 
1.2500 | 
1.750 
1.750 
1.750 
1.750 
2.250 | 
1.750 
1.750 
1.750 
1.750 
2.000 | 
3.189 
3.180 
2.350 
2.350 
2.350 | 
5/8 – 11 
5/8 – 11 
5/8 – 11 
5/8 – 11 
5/8 – 11 | 
 
STANDARD LENGTH 
Inch Sizes | 
SC40E0187 
SC40E0250 
SC40E0312 
SC40E0375 
SC40E0437 
SC40E0500 
SC40E0625 
SC40E0750 
SC40E0875 
SC40E1000 
SC40E1250 
SC40E1500 | 
0.1875 
0.2500 
0.3125 
0.3750 
0.4375 
0.5000 
0.6250 
0.7500 
0.8750 
1.0000 
1.2500 
1.5000 | 
1.000 
1.000 
1.000 
1.000 
1.250 
1.250 
1.500 
1.870 
2.000 
2.000 
2.500 
2.620 | 
2.500 
2.500 
2.500 
2.500 
2.620 
2.620 
3.750 
3.750 
4.000 
4.000 
4.250 
4.620 | 
3.600 
3.600 
3.600 
3.800 
3.800 
3.800 
3.800 
3.940 
4.250 
4.500 
2.310 
2.500 | 
5/8 – 11 
5/8 – 11 
5/8 – 11 
5/8 – 11 
5/8 – 11 
5/8 – 11 
5/8 – 11 
5/8 – 11 
5/8 – 11 
5/8 – 11 
5/8 – 11 
5/8 – 11 | 
 
EXTENDED LENGTH 
Inch Sizes | 
SC40EE0187 
SC40EE0250 
SC40EE0375 
SC40EE0500 
SC40EE0625 
SC40EE0750 
SC40EE0875 
SC40EE1000 
SC40EE1250 | 
0.1875 
0.2500 
0.3750 
0.5000 
0.6250 
0.7500 
0.8750 
1.0000 
1.2500 | 
1.000 
1.000 
1.250 
1.500 
1.750 
2.000 
2.000 
2.000 
2.500 | 
6.000 
6.000 
6.000 
6.000 
6.000 
6.000 
6.000 
6.000 
6.000 | 
3.800 
3.800 
3.800 
3.800 
3.800 
3.800 
4.250 
4.500 
2.310 | 
5/8 – 11 
5/8 – 11 
5/8 – 11 
5/8 – 11 
5/8 – 11 
5/8 – 11 
5/8 – 11 
5/8 – 11 
5/8 – 11 | 
 
 
NOTE: Holders balanced to 22,000 RPM available upon request  | 
 | 
Buy CAT 40 End Mill Holders
 
 
| 
 NOTE: Dimensions for Metric tool holders are in Millimeters. 
 | 
Part No. | 
D | 
D1 | 
L | 
Retention Knob Thread | 
 
| CAT 40 | 
STUB LENGTH 
Metric Sizes | 
SC40SE06MM 
SC40SE08MM 
SC40SE10MM 
SC40SE12MM 
SC40SE16MM 
SC40SE20MM 
SC40SE25MM 
SC40SE32MM | 
6 
8 
10 
12 
16 
20 
25 
32 | 
25 
28 
35 
42 
44.5 
44.5 
44.5 
57 | 
45 
45 
45 
45 
45 
45 
45 
50 | 
⅝-11 
⅝-11 
⅝-11 
⅝-11 
⅝-11 
⅝-11 
⅝-11 
⅝-11 | 
 
STANDARD LENGTH 
Metric Sizes | 
SC40E06MM 
SC40E08MM 
SC40E10MM 
SC40E12MM 
SC40E16MM 
SC40E20MM 
SC40E25MM 
SC40E32MM 
SC40E40MM | 
6 
8 
10 
12 
16 
20 
25 
32 
40 | 
25 
28 
35 
42 
48 
52 
65 
72 
80 | 
65 
65 
65 
65 
95 
95 
100 
105 
115 | 
⅝-11 
⅝-11 
⅝-11 
⅝-11 
⅝-11 
⅝-11 
⅝-11 
⅝-11 
⅝-11 | 
 
EXTENDED LENGTH 
Metric Sizes | 
SC40EE06MM 
SC40EE08MM 
SC40EE10MM 
SC40EE12MM 
SC40EE16MM 
SC40EE20MM 
SC40EE25MM 
SC40EE32MM 
SC40EE40MM | 
6 
8 
10 
12 
16 
20 
25 
32 
40 | 
25 
28 
35 
42 
48 
52 
65 
72 
80 | 
150 
150 
150 
150 
150 
150 
150 
150 
150 | 
⅝-11 
⅝-11 
⅝-11 
⅝-11 
⅝-11 
⅝-11 
⅝-11 
⅝-11 
⅝-11 | 
 
 
NOTE: Holders balanced to 22,000 RPM available upon request  | 
 | 
Buy CAT 40 End Mill Holders
 
 
  | 
 
 
 | 
Part No. | 
D | 
D1 | 
L | 
L1 | 
Retention Knob Thread | 
 
| CAT 50 | 
STUB LENGTH 
Inch Sizes | 
SC50SE0625 
SC50SE0750 
SC50SE1000 
SC50SE1250 
SC50SE1500 | 
0.6250 
0.7500 
1.0000 
1.2500 
1.5000 | 
1.75 
1.75 
2.00 
2.50 
2.62 | 
2.06 
2.06 
2.25 
2.25 
2.75 | 
4.500 
4.500 
4.500 
2.750 
2.750 | 
1″ – 8 
1″ – 8 
1″ – 8 
1″ – 8 
1″ – 8 | 
 
STANDARD LENGTH 
Inch Sizes | 
SC50E0187 
SC50E0250 
SC50E0312 
SC50E0375 
SC50E0437 
SC50E0500 
SC50E0625 
SC50E0750 
SC50E0875 
SC50E1000 
SC50E1250 
SC50E1500 
SC50E1750 
SC50E2000 | 
0.1875 
0.2500 
0.3125 
0.3750 
0.4375 
0.5000 
0.6250 
0.7500 
0.8750 
1.0000 
1.2500 
1.5000 
1.7500 
2.0000 | 
0.680 
0.750 
0.750 
1.000 
1.250 
1.380 
1.500 
1.750 
2.000 
2.000 
2.500 
2.750 
1.320 
3.750 | 
2.500 
2.500 
2.500 
2.500 
2.500 
2.620 
3.750 
3.750 
3.750 
4.000 
4.000 
4.000 
4.000 
5.620 | 
3.800 
3.800 
3.800 
4.000 
4.000 
5.000 
6.000 
4.000 
4.310 
4.500 
2.750 
3.500 
3.750 
3.500 | 
1” – 8 
1” – 8 
1” – 8 
1” – 8 
1” – 8 
1” – 8 
1” – 8 
1” – 8 
1” – 8 
1” – 8 
1” – 8 
1” – 8 
1” – 8 
1” – 8 | 
 
EXTENDED LENGTH 
Inch Sizes | 
SC50EE0187 
SC50EE0250 
SC50EE0312 
SC50EE0375 
SC50EE0437 
SC50EE0500 
SC50EE0625 
SC50EE0750 
SC50EE0875 
SC50EE1000 
SC50EE1250 
SC50EE1500 
SC50EE2000 | 
0.1875 
0.2500 
0.3125 
0.3750 
0.4375 
0.5000 
0.6250 
0.7500 
0.8750 
1.0000 
1.2500 
1.5000 
2.0000 | 
0.680 
0.750 
0.750 
1.000 
1.250 
1.38 
1.500 
1.750 
1.870 
2.000 
2.500 
2.750 
3.750 | 
4.500 
4.500 
4.500 
4.500 
4.500 
4.620 
5.750 
5.750 
5.750 
6.000 
6.000 
6.000 
7.620 | 
7.000 
7.000 
7.000 
7.000 
7.000 
7.000 
8.000 
4.310 
4.310 
4.500 
2.750 
3.500 
3.500 | 
1″ – 8 
1″ – 8 
1″ – 8 
1″ – 8 
1″ – 8 
1″ – 8 
1″ – 8 
1″ – 8 
1″ – 8 
1″ – 8 
1″ – 8 
1″ – 8 
1″ – 8 | 
 
 
NOTE: Holders balanced to 22,000 RPM available upon request  | 
 | 
Buy CAT 50 End Mill Holders
 
 
| 
 NOTE: Dimensions for Metric tool holders are in Millimeters. 
 | 
Part No. | 
D | 
D1 | 
L | 
Retention Knob Thread | 
 
| CAT 50 | 
STUB LENGTH 
Metric Sizes | 
SC50SE06MM 
SC50SE08MM 
SC50SE10MM 
SC50SE12MM 
SC50SE16MM 
SC50SE20MM 
SC50SE25MM 
SC50SE32MM | 
6 
8 
10 
12 
16 
20 
25 
32 | 
25 
28 
35 
42 
48 
52 
65 
70 | 
50 
50 
50 
50 
50 
50 
55 
55 | 
1” – 8 
1” – 8 
1” – 8 
1” – 8 
1” – 8 
1” – 8 
1” – 8 
1” – 8 | 
 
STANDARD LENGTH 
Metric Sizes | 
SC50E06MM 
SC50E08MM 
SC50E10MM 
SC50E12MM 
SC50E16MM 
SC50E20MM 
SC50E25MM 
SC50E32MM 
SC50E40MM 
SC50E50MM | 
6 
8 
10 
12 
16 
20 
25 
32 
40 
50 | 
25 
28 
35 
42 
48 
52 
65 
72 
80 
100 | 
65 
65 
65 
65 
95 
95 
100 
100 
100 
140 | 
1” – 8 
1” – 8 
1” – 8 
1” – 8 
1” – 8 
1” – 8 
1” – 8 
1” – 8 
1” – 8 
1” – 8 | 
 
EXTENDED LENGTH 
Metric Sizes | 
SC50EE06MM 
SC50EE08MM 
SC50EE10MM 
SC50EE12MM 
SC50EE16MM 
SC50EE20MM 
SC50EE25MM 
SC50EE32MM 
SC50EE40MM 
SC50EE50MM | 
6 
8 
10 
12 
16 
20 
25 
32 
40 
50 | 
25 
28 
35 
42 
48 
52 
65 
72 
80 
 
100 | 
115 
115 
115 
115 
145 
145 
150 
150 
150 
195 | 
1″ – 8 
1″ – 8 
1″ – 8 
1″ – 8 
1″ – 8 
1″ – 8 
1″ – 8 
1″ – 8 
1″ – 8 
1″ – 8 | 
 
 
NOTE: Holders balanced to 22,000 RPM available upon request  | 
 | 
Buy CAT 50 End Mill Holders
 
 
 | 
Part No. | 
D | 
D1 | 
L | 
Retention Knob Thread | 
 
| CAT 40 | 
COOLANT 
THROUGH | 
SC40EK0187 
SC40EK0250 
SC40EK0312 
SC40EK0375 
SC40EK0437 
SC40EK0500 
SC40EK0625 
SC40EK0750 
SC40EK0875 
SC40EK1000 
SC40EK1250 
SC40EK1500 | 
0.0188 
0.250 
0.3125 
0.375 
0.4375 
0.500 
0.625 
0.750 
0.875 
1.000 
1.250 
1.500 | 
0.680 
0.750 
0.750 
1.000 
1.250 
1.250 
1.500 
1.750 
2.000 
2.500 
2.500 
2.600 | 
2.500 
1.375 
2.500 
2.500 
2.500 
2.620 
3.750 
3.750 
3.750 
4.000 
4.000 
4.000 | 
5/8 – 11 
5/8 – 11 
5/8 – 11 
5/8 – 11 
5/8 – 11 
5/8 – 11 
5/8 – 11 
5/8 – 11 
5/8 – 11 
5/8 – 11 
5/8 – 11 
5/8 – 11 | 
 
 
 | 
 | 
Buy CAT 40 Coolant-Through End Mill Holders
 
 
| 
 | 
CAT 40
| Part No. | 
T Taper | 
D | 
L | 
 
C40MT1 
C40MT2 
C40MT3 
C40MT4 | 
1 
2 
3 
4 | 
1.000 
1.250 
3.000 
3.750 | 
1.750 
2.440 
3.000 
3.750 | 
 
 
 | 
CAT 50
| Part No. | 
T Taper | 
D | 
L | 
 
C50MT2 
C50MT3 
C50MT4 
C50MT5 | 
2 
3 
4 
5 | 
1.250 
1.620 
2.200 
2.750 | 
2.000 
2.500 
3.380 
3.750 | 
 
 
 | 
 | 
Buy CAT Morse Taper Holders
 
 
| 
 | 
CAT 40
| Part No. | 
T Taper | 
D | 
L | 
 
C40JT2 
C40JT3 
C40JT4 
C40JT6 
C40JT33 | 
2 
3 
4 
6 
33 | 
0.559 
0.811 
1.120 
0.676 
0.624 | 
1.375 
1.375 
1.375 
1.375 
1.375 | 
 
 
 | 
CAT 50
| Part No. | 
T Taper | 
D | 
L | 
 
C50JT2 
C50JT3 
C50JT4 
C50JT6 
C50JT33 | 
2 
3 
4 
6 
33 | 
0.559 
0.811 
1.120 
0.676 
0.624 | 
1.375 
1.375 
1.375 
1.375 
1.375 | 
 
 
 | 
 | 
Buy CAT Jacobs Taper Holders
 
 
| 
 | 
| CAT 40 | 
Part No. | 
D | 
D1 | 
L | 
L1 | 
K | 
T | 
S | 
 
C40SM0750 
C40SME0750 
C40SM1000 
C40SME1000 
C40SM1250 
C40SME1250 
C40SM1500 
C40SME1500 | 
0.750 
0.750 
1.000 
1.000 
1.250 
1.250 
1.500 
1.500 | 
1.75 
1.75 
2.19 
2.19 
2.88 
2.88 
3.81 
3.81 | 
1.375 
4.000 
2.062 
4.000 
2.125 
4.000 
2.406 
4.000 | 
0.68 
0.68 
0.68 
0.68 
0.68 
0.68 
0.94 
0.94 | 
0.31 
0.31 
0.38 
0.38 
0.50 
0.50 
0.62 
0.62 | 
3/8 – 24 
3/8 – 24 
1/2 – 20 
1/2 – 20 
5/8 – 18 
5/8 – 18 
3/4 – 18 
3/4 – 18 | 
C5002 
C5002 
C5003 
C5003 
C5004 
C5004 
C5005 
C5005 | 
 
 
  
| CAT 50 | 
Part No. | 
D | 
D1 | 
L | 
L1 | 
K | 
T | 
S | 
 
C50SM0750 
C50SME0750 
C50SMEX0750 
C50SM1000 
C50SME1000 
C50SMEX1000 
C50SM1250 
C50SME1250 
C50SMEX1250 
C50SM1500 
C50SME1500 
C50SMEX1500 
C50SM2000 
C50SME2000 
C50SMEX2000 
C50SM2500 
C50SME2500 
C50SMEX2500 | 
0.750 
0.750 
0.750 
1.000 
1.000 
1.000 
1.250 
1.250 
1.250 
1.500 
1.500 
1.500 
2.000 
2.000 
2.000 
2.500 
2.500 
2.500 | 
1.750 
1.750 
1.750 
2.750 
2.750 
2.750 
2.880 
2.880 
2.880 
3.810 
3.810 
3.810 
4.875 
4.875 
4.875 
4.875 
4.875 
4.875 | 
1.50 
3.50 
5.50 
2.00 
4.00 
6.00 
1.50 
3.50 
5.50 
2.40 
4.00 
6.00 
2.40 
4.00 
6.00 
2.40 
4.00 
6.00 | 
0.680 
0.680 
0.680 
0.680 
0.680 
0.680 
0.680 
0.680 
0.680 
0.930 
0.930 
0.930 
0.930 
0.930 
0.930 
1.125 
1.125 
1.125 | 
0.31 
0.31 
0.31 
0.38 
0.38 
0.38 
0.50 
0.50 
0.50 
0.62 
0.62 
0.62 
0.75 
0.75 
0.75 
1.00 
1.00 
1.00 | 
3/8 – 24 
3/8 – 24 
3/8 – 24 
1/2 – 20 
1/2 – 20 
1/2 – 20 
5/8 – 18 
5/8 – 18 
5/8 – 18 
3/4 – 16 
3/4 – 16 
3/4 – 16 
1″ – 14 
1″ – 14 
1″ – 14 
1″ – 14 
1″ – 14 
1″ – 14 | 
C5002 
C5002 
C5002 
C5003 
C5003 
C5003 
C5004 
C5004 
C5004 
C5005 
C5005 
C5005 
C5006 
C5006 
C5006 
C5006 
C5006 
C5006 | 
 
 
 | 
 | 
Buy CAT Shell Mill Holders