Please make sure that the Retention Knob you order is the correct one for your machine. Using the wrong Retention Knob can cause damage to your machine spindle, the tool holder, and may cause a safety hazard.
Mas Style
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Techniks Retention Knobs
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All mating surfaces precision ground
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Manufactured to the highest standards
for maximum safety and long life
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Look up Retention Knobs Sockets by
CNC machine manufacturer
Ansi Style
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CAT Retention Knobs
| Part No. |
Type |
Ø |
d1 |
d2 |
d3 |
L |
l1 |
l2 |
T |
| 21006-15 |
CAT 40-DIN |
15° |
.75" |
0.55" |
0.640" |
1.88" |
1.024" |
.787" |
5/8 - 11" |
| 21007-15 |
CAT 40-DIN |
15° |
.75" |
0.55" |
- |
1.89" |
1.028" |
.792" |
5/8 - 11" |
| 21003 |
CAT 40-ANSI |
45° |
0.740" |
0.490" |
0.490" |
1.50" |
0.640" |
.440" |
5/8 - 11" |
| 21003-45 |
CAT 40-MAS-I |
45° |
0.590" |
0.394" |
0.512" |
2.25" |
1.266" |
.990" |
5/8 - 11" |
| 21003-60 |
CAT 40-MAS-II |
60° |
0.590" |
0.394" |
0.512" |
2.25" |
1.266" |
.990" |
5/8 - 11" |
| 21003-90 |
CAT 40-MAS-III |
90° |
0.590" |
0.394" |
0.512" |
2.25" |
1.266" |
.990" |
5/8 - 11" |
| 21005-45 |
CAT 50-MAS-I |
45° |
0.906" |
0.669" |
0.827" |
3.346" |
1.772" |
1.378" |
1 - 8" |
| 21005-60 |
CAT 50-MAS-II |
60° |
0.906" |
0.669" |
0.827" |
3.346" |
1.772" |
1.378" |
1 - 8" |
| 21005-90 |
CAT 50-MAS-III |
90° |
0.906" |
0.669" |
0.827" |
3.346" |
1.772" |
1.378" |
1 - 8" |
| 21008-15 |
CAT 50-DIN |
15° |
1.101" |
0.825" |
- |
2.640" |
1.338" |
.984 " |
1 - 8" |
| 21005 |
CAT 50-ANSI |
45° |
1.140" |
0.820" |
0.820" |
2.30" |
1.00" |
.700" |
1 - 8" |
CAT Coolant Thru Retention Knobs
| Part No. |
Type |
Ø |
d1 |
d2 |
d3 |
L |
l1 |
l2 |
T |
| 21006-15C |
CAT 40-DIN Coolant |
15° |
.75" |
0.55" |
0.640" |
1.88" |
1.024" |
.787" |
5/8 - 11" |
| 21007-15C |
CAT 40-DIN Coolant |
15° |
.75" |
0.55" |
- |
1.89" |
1.028" |
.792" |
5/8 - 11" |
| 21003-C |
CAT 40-ANSI-C |
45° |
0.740" |
0.490" |
0.490" |
1.50" |
0.640" |
.440" |
5/8 - 11" |
| 21003-45C |
CAT 40-Coolant-I |
45° |
0.590" |
0.394" |
0.512" |
2.25" |
1.266" |
.990" |
5/8 - 11" |
| 21003-60C |
CAT 40-Coolant-II |
60° |
0.590" |
0.394v |
0.512" |
2.25" |
1.266" |
.990" |
5/8 - 11" |
| 21003-90C |
CAT 40-Coolant-III |
90° |
0.590" |
0.394" |
0.512" |
2.25" |
1.266" |
.990" |
5/8 - 11" |
| 21003-45CSF |
CAT 40-Coolant-I Slim Fit |
45° |
0.590" |
0.394" |
0.512" |
2.25" |
1.266" |
.990" |
5/8 - 11" |
| 21003-60CSF |
CAT 40-Coolant-II Slim Fit |
60° |
0.590" |
0.394v |
0.512" |
2.25" |
1.266" |
.990" |
5/8 - 11" |
| 21003-90CSF |
CAT 40-Coolant-III Slim Fit |
90° |
0.590" |
0.394" |
0.512" |
2.25" |
1.266" |
.990" |
5/8 - 11" |
| 21005-45C |
CAT 50-Coolant-I |
45° |
0.906" |
0.669" |
0.827" |
3.346" |
1.772" |
1.378" |
1 - 8" |
| 21005-60C |
CAT 50-Coolant-II |
60° |
0.906" |
0.669" |
0.827" |
3.346" |
1.772" |
1.378" |
1 - 8" |
| 21005-90C |
CAT 50-Coolant-III |
90° |
0.906" |
0.669" |
0.827" |
3.346" |
1.772" |
1.378" |
1 - 8" |
| 21008-15C |
CAT 50-DIN Coolant |
15° |
1.101" |
0.825" |
- |
2.640" |
1.338" |
.984" |
1 - 8" |
| 21005-C |
CAT 50-ANSI-C |
45° |
1.140" |
0.820" |
0.820" |
2.30" |
1.00" |
.700" |
1 - 8" |
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