ER Collet Ultra High Precision 0.005mm / 5u run-out. These are not your blue/yellow boxed collets that are the cheapest of cheapest of collets that do not specify a precision value. A high precision collet allows for quieter machining, longer tool life and greater cut accuracy.
Available in ER11, ER16, ER20 and ER25 in common sizes 3.175mm (1/8"), 4mm, 6mm, 6.35mm (1/4"), 8mm, 10mm and 12.7mm (appropriate to ER size). Clamping range is that of nominal inner diameter size -1mm (eg. 6mm would accept 5mm to 6mm).
How to check what diameter you have
| ER Collet | Length | Diameter | Range |
|---|---|---|---|
| ER-11 | 18 mm | 11.5 mm | 0.5—7 mm |
| ER-16 | 27.5 mm | 17 mm | 0.5—9 mm |
| ER-20 | 31.5 mm | 21 mm | 1—13 mm |
| ER-25 | 34 mm | 26 mm | 1—16 mm |
| ER-32 | 40 mm | 33 mm | 1—21 mm |
| ER-40 | 46 mm | 41 mm | 3—26 mm |
Best for
- Replacing a worn ER20 collet in a CNC spindle or ER20 tool holder
- Upgrading cheap unrated collets to 0.005mm runout for longer tool life and a better finish
- Shank sizes from 3.175mm (1/8") to 12.7mm (1/2")
Not for
- Makita trim routers and Perske RDO spindles: they use their own collets
- Sharing one collet across shank sizes: each clamps only down to 1mm under its size
Adam's Tip
Order the collet that matches your bit's shank exactly, and buy the ER20 nut if yours is worn. Clean the collet, nut and spindle taper every bit change, and never tighten the nut on an empty collet.
Buying guide: ER Collet Size Guide
11 Reviews Hide Reviews Show Reviews
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ER20 Collet's
Excellent quality, tooling bits fit so much better and clamping is more even. Great purchase.
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WR20 collets
Super fast delivery I am super impressed. Product looks great.
