 
These collets and collet nuts conform to DIN 6388 standards and are popular in the woodworking industry on Perske motor spindles.
If you have any trouble identifying these collets or nuts measure the length and the diameter and compare them to the dimension charts below.
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Din 6388 Collets & Nuts
To Use
Snap collet into the nut before screwing nut onto spindle or collet holder.
Left hand collet nuts available on request.
DIN 6388 Collet Dimensions 
| EOC 08 |
SYOZ 20 |
EOC 16 |
SYOZ 25 |
Measurement |
| 26mm |
34mm |
40mm |
52mm |
L (Collet Length) |
| 14.4mm |
20mm |
25.5mm |
35mm |
D (Diameter) |
DIN 6388 Nut Dimension
| EOC 08 |
SYOZ 20 |
EOC 16 |
SYOZ 25 |
Measurement |
| 19mm |
20mm |
24mm |
30mm |
L (Nut Length) |
| 30mm |
35mm |
43mm |
60mm |
D (Diameter) |
DIN 6388 Nuts and Wrenches
| EOC 08 |
SYOZ 20 |
EOC 16 |
SYOZ 25 |
Description |
| 3508 |
3520 |
3636 |
3638 |
Nut |
| - |
22220 |
- |
3691 |
Wrench |
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Din 6388 Collets
| EOC 08 |
SYOZ 20 |
EOC 16 |
SYOZ 25 |
Shank Diameter |
| 03508-1/8 |
03520-1/8 |
03531-1/8 |
03868-1/8 |
1/8" |
| 03508-3/16 |
03520-3/16 |
03531-3/16 |
03868-3/16 |
3/16" |
| 03508-1/4 |
03520-1/4 |
03531-1/4 |
03868-1/4 |
1/4" |
| 03508-5/16 |
03520-5/16 |
03531-5/16 |
03868-5/16 |
5/16" |
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03520-3/8 |
03531-3/8 |
03868-3/8 |
3/8" |
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03520-7/16 |
03531-7/16 |
03868-7/16 |
7/16" |
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03520-1/2 |
03531-1/2 |
03868-1/2 |
1/2" |
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03531-9/16 |
03868-9/16 |
9/16" |
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03531-5/8 |
03868-5/8 |
5/8" |
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03868-3/4 |
3/4" |
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03868-7/8 |
7/8" |
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03868-1 |
1" |
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03520-10 |
03531-10 |
03868-10 |
10mm |
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03531-16 |
03868-16 |
16mm |
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03868-20 |
20mm |
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03868-25 |
25mm |
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