Techniks ER20 Precision Collet 1/4"
- 1/4 inch capacity, 0.25 inch thread size
- .0002 accuracy claimed in the title
- ER20 collet chuck
- Spring steel, keyed handle, manual lock
- Chuck key included
Last refreshed Aug 4, 2026 · Based on the Amazon listing and published specifications, not hands-on testing.
A quarter inch precision collet for drilling, milling, lathe and grinding setups. The listing does not cover collet nut, holder or taper details, so check your spindle before ordering.
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ASIN: B01MRRWWQXModel: ER20Category: Clamps
Overview
Not a bench clamp despite its category label, this Techniks piece is an ER20 collet for holding small round tools. It is made of spring steel, closes with a manual lock, and is tightened with the chuck key in the listing.
Choose it for the stated accuracy figure and the wide list of compatible machines. The listing gives only one capacity, so anyone needing several shank sizes would have to buy more collets.
Who it's for
A machinist who already owns the housing and nut for an ER20 system and needs one more size. The collet works on the machines the listing names. A buyer starting from nothing needs the holder as well.
Pros and cons
- Quarter inch capacity
- Stated precision accuracy
- Chuck key included
- Spring steel construction
- Only one size offered
- Collet nut not listed
- Taper or holder type not listed
Performance notes
Accuracy in a collet comes from how evenly it closes around the shank, so runout depends on a clean seat and a properly tightened nut. The spring steel flexes slightly to grip. The stated precision figure is a title claim, and the listing gives no test method.
Specifications
| Brand | Techniks |
|---|---|
| Model | ER20 |
| Dimensions & fit | |
| Thread Size | 0.25 inches (6.35 mm) |
| Capacity & performance | |
| Capacity | 0.25 inches |
| Construction & materials | |
| Material Type | Spring Steel |
| Compatibility & installation | |
| Compatible Devices | Drilling Machine, Lathe, Milling Machine, Grinding Machine |
| Included components | |
| Included Components | Chuck Key |
| Unit Count | 1 Count |
| Other details | |
| Handle Type | keyed |
| Lock Type | manual |
Frequently asked questions
Is the Techniks ER20 a clamp?
No. It is filed under clamps, but the listing describes a quarter inch ER20 collet for drilling, lathe, milling and grinding machines.
What size tool does the Techniks ER20 collet hold?
The listing gives a capacity and thread size of 0.25 inches, with 6.35 mm shown for the thread.