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SK & SX Collets
Nikken and others call these "SK" collets but HPI calls their compatible collet "SX"
Features:
Increased Gripping Power:
 The 8° Collets seat deeper in the body of the holder providing increased rigidity.
This also results in better concentricity and stronger gripping power.
High Accuracy:
Run-out accuracy is less than 5µm at four times the diameter of the cutting tool shank
Note:
SK & SX Collets are NOT interchangeable with
Acura-Flex,
TG or
ER collets.
Size Overview:
Nikken part numbers, dimensions and specifications
Series |
Size Range mm |
Size Range inch |
L* |
D* |
Price and
Availability |
SK06 |
0.7 - 6.0 |
0.027 - 0.236 |
? |
? |
~ |
SK10 |
1.75 - 10 |
0.069 - 0.393 |
1.21" |
.605" |
Click |
SK16 |
2.75 - 16 |
0.108 - 0.629 |
1.75" |
0.96 |
Click |
SK25 |
16.0 - 25.4 |
0.629 - 1.000 |
2.25" |
1.4" |
Click |
* = These are average caliper dimensions from units I have.
SK06 Collets
Price and Availability
metric
Part No. |
Size Range mm |
Size Range inch |
SK6-0.8 |
0.7 - 0.8 |
0.027 - 0.031 |
SK6-1 |
0.9 - 1.0 |
0.035 - 0.039 |
SK6-1.25 |
1.15 - 1.25 |
0.045 - 0.049 |
SK6-1.5 |
1.3 - 1.5 |
0.051 - 0.059 |
SK6-1.75 |
1.5 - 1.75 |
0.059 - 0.068 |
SK6-2 |
1.8 - 2.0 |
0.070 - 0.078 |
SK6-2.25 |
2.05 - 2.25 |
0.080 - 0.088 |
SK6-2.5 |
2.3 - 2.5 |
0.090 - 0.098 |
SK6-2.75 |
2.55 - 2.75 |
0.100 - 0.108 |
SK6-3 |
2.8 - 3.0 |
0.110 - 0.118 |
SK6-3.5 |
3.0 - 3.5 |
0.118 - 0.137 |
SK6-4 |
3.5 - 4.0 |
0.137 - 0.157 |
SK6-4.5 |
4.0 - 4.5 |
0.157 - 0.177 |
SK6-5 |
4.5 - 5.0 |
0.177 - 0.196 |
SK6-5.5 |
5.0 - 5.5 |
0.196 - 0.216 |
SK6-6 |
5.5 - 6.0 |
0.216 - 0.236 |
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[Back]
SK10 Collets
Price and Availability
metric
Part No. |
Size Range mm |
Size Range inch |
SK10-2 |
1.75 - 2.0 |
0.068 - 0.078 |
SK10-2.25 |
2.0 - 2.25 |
0.078 - 0.088 |
SK10-2.5 |
2.25 - 2.5 |
0.088 - 0.098 |
SK10-2.75 |
2.5 - 2.75 |
0.098 - 0.108 |
SK10-3 |
2.75 - 3.0 |
0.108 - 0.118 |
SK10-3.5 |
3.0 - 3.5 |
0.118 - 0.137 |
SK10-4 |
3.5 - 4.0 |
0.137 - 0.157 |
SK10-4.5 |
4.0 - 4.5 |
0.157 - 0.177 |
SK10-5 |
4.5 - 5.0 |
0.177 - 0.196 |
SK10-5.5 |
5.0 - 5.5 |
0.196 - 0.216 |
SK10-6 |
5.5 - 6.0 |
0.216 - 0.236 |
SK10-6.5 |
6.0 - 6.5 |
0.236 - 0.255 |
SK10-7 |
6.5 - 7.0 |
0.255 - 0.275 |
SK10-7.5 |
7.0 - 7.5 |
0.275 - 0.295 |
SK10-8 |
7.5 - 8.0 |
0.295 - 0.314 |
SK10-8.5 |
8.0 - 8.5 |
0.314 - 0.334 |
SK10-9 |
8.5 - 9.0 |
0.334 - 0.354 |
SK10-9.5 |
9.0 - 9.5 |
0.354 - 0.374 |
SK10-10 |
9.5 - 10.0 |
0.374 - 0.393 |
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inch
Part No. |
Size |
SK10-1/8A |
0.125 |
SK10-3/16A |
0.187 |
SK10-1/4A |
0.250 |
SK10-5/16A |
0.312 |
SK10-3/8A |
0.375 |
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SK16 Collets
Price and Availability
metric
Part No. |
Size Range mm |
Size Range inch |
SK16-3 |
2.75 - 3.0 |
0.108 - 0.118 |
SK16-3.5 |
3.0 - 3.5 |
0.118 - 0.137 |
SK16-4 |
3.5 - 4.0 |
0.137 - 0.157 |
SK16-4.5 |
4.0 - 4.5 |
0.157 - 0.177 |
SK16-5 |
4.5 - 5.0 |
0.177 - 0.196 |
SK16-5.5 |
5.0 - 5.5 |
0.196 - 0.216 |
SK16-6 |
5.5 - 6.0 |
0.216 - 0.236 |
SK16-6.5 |
6.0 - 6.5 |
0.236 - 0.255 |
SK16-7 |
6.5 - 7.0 |
0.255 - 0.275 |
SK16-7.5 |
7.0 - 7.5 |
0.275 - 0.295 |
SK16-8 |
7.5 - 8.0 |
0.295 - 0.314 |
SK16-8.5 |
8.0 - 8.5 |
0.314 - 0.334 |
SK16-9 |
8.5 - 9.0 |
0.334 - 0.354 |
SK16-9.5 |
9.0 - 9.5 |
0.354 - 0.374 |
SK16-10 |
9.5 - 10.0 |
0.374 - 0.393 |
SK16-10.5 |
10.0 - 10.5 |
0.393 - 0.413 |
SK16-11 |
10.5 - 11.0 |
0.413 - 0.433 |
SK16-11.5 |
11.0 - 11.5 |
0.433 - 0.452 |
SK16-12 |
11.5 - 12.0 |
0.452 - 0.472 |
SK16-12.5 |
12.0 - 12.5 |
0.472 - 0.492 |
SK16-13 |
12.5 - 13.0 |
0.492 - 0.511 |
SK16-13.5 |
13.0 - 13.5 |
0.511 - 0.531 |
SK16-14 |
13.5 - 14.0 |
0.531 - 0.551 |
SK16-14.5 |
14.0 - 14.5 |
0.551 - 0.570 |
SK16-15 |
14.5 - 15.0 |
0.570 - 0.590 |
SK16-15.5 |
15.0 - 15.5 |
0.590 - 0.610 |
SK16-16 |
15.5 - 16.0 |
0.610 - 0.629 |
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inch
Part No. |
Size |
SK16-1/8A |
0.125 |
SK16-3/16A |
0.187 |
SK16-1/4A |
0.250 |
SK16-5/16A |
0.312 |
SK16-3/8A |
0.375 |
SK16-7/16A |
0.437 |
SK16-1/2A |
0.500 |
SK16-9/16A |
0.562 |
SK16-5/8A |
0.625 |
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[Back]
SK25 Collets
Price and Availability
metric
Part No. |
Size Range mm |
Size Range inch |
SK25-16.5 |
16.0 - 16.5 |
0.629 - 0.649 |
SK25-17 |
16.5 - 17.0 |
0.649 - 0.669 |
SK25-17.5 |
17.0 - 17.5 |
0.669 - 0.688 |
SK25-18 |
17.5 - 18.0 |
0.688 - 0.708 |
SK25-18.5 |
18.0 - 18.5 |
0.708 - 0.728 |
SK25-19 |
18.5 - 19.0 |
0.728 - 0.748 |
SK25-19.5 |
19.0 - 19.5 |
0.748 - 0.767 |
SK25-20 |
19.5 - 20.0 |
0.767 - 0.787 |
SK25-20.5 |
20.0 - 20.5 |
0.787 - 0.807 |
SK25-21 |
20.5 - 21.0 |
0.807 - 0.826 |
SK25-21.5 |
21.0 - 21.5 |
0.826 - 0.846 |
SK25-22 |
21.5 - 22.0 |
0.846 - 0.866 |
SK25-22.5 |
22.0 - 22.5 |
0.866 - 0.885 |
SK25-23 |
22.5 - 23.0 |
0.885 - 0.905 |
SK25-23.5 |
23.0 - 23.5 |
0.905 - 0.925 |
SK25-24 |
23.5 - 24.0 |
0.925 - 0.944 |
SK25-24.5 |
24.0 - 24.5 |
0.944 - 0.964 |
SK25-25 |
24.5 - 25.0 |
0.964 - 0.984 |
SK25-25.4 |
25.0 - 25.4 |
0.984 - 1.000 |
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inch
Part No. |
Size |
SK25-3/16A |
0.187 |
SK25-1/4A |
0.250 |
SK25-5/16A |
0.312 |
SK25-3/8A |
0.375 |
SK25-7/16A |
0.437 |
SK25-1/2A |
0.500 |
SK25-5/8A |
0.625 |
SK25-3/4A |
0.750 |
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Note:
The specifications and information provided on this page are intended for part identification purposes only.
Although we believe them to be correct, dimensions should not be used for part construction or inspection.
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