Perske RDO spindles use their own DIN 6388A (OZ12A / EOC12A) collet rather than the ER series, so a standard ER collet will not fit. These 6-slot spring steel collets are made to the DIN standard with a 20mm outside diameter and 34mm length, giving a secure, concentric grip on cutters in Perske and compatible high frequency spindles.
Perske RDO collet for Perske spindles.
Specifications
- Codes RDO20, OZ12A, EOC12A, V50-60
- Outside diameter 20mm
- Collet length 34mm
- Material 65Mn Spring Steel
- Manufacturing Standard DIN6388A 6 slots

Sizes 3.175mm (1/8") to 12.7mm (1/2") including 4, 6, 6.35, 8, 10 and 12mm. Check the collet code stamped on your existing collet or spindle nut against RDO20 / OZ12A / EOC12A before ordering.
Stocked in our Laverton North (Melbourne) warehouse and shipped Australia-wide. Standard shipping is free on orders over $200.
Best for
- Perske RDO spindles and compatible high-frequency spindles
- Shanks from 3.175mm (1/8") to 12.7mm (1/2")
Not for
- ER-collet spindles: see the ER collets
Adam's Tip
Check the code stamped on your existing collet (OZ12A / EOC12A / RDO20) before ordering, and order the size that matches your shank exactly.
Buying guide: ER Collet Size Guide