Shars 202-5111 Precision R8 Collet 3/8"
- R8 collet, TIR 0.0006 inch
- 7/16-20 UNF thread size
- Hand-tightened, manual lock
- Steel, **12 oz**
- For drilling, grinding, lathe and milling machines
Last refreshed Aug 4, 2026 · Based on the Amazon listing and published specifications, not hands-on testing.
A precision R8 collet for a three eighths inch shank with a stated runout figure. The listing does not give the length or the shank tolerance.
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ASIN: B081K4Q93HModel: 202-5111Category: Clamps
Overview
A hand-tightened steel collet holds a tool shank in the spindle on this Shars R8 piece. The listing names drilling, grinding, lathe and milling machines as the places it works.
Choose it for a precision tool holder with a published runout figure, useful on a mill that takes R8 tooling. The limitation is sparse detail, since overall length and the shank range around its capacity are not given.
Who it's for
A machinist who already has an R8 spindle and needs one more shank size. The stated total indicator reading helps those watching runout. Someone with an ER collet system needs a different part.
Pros and cons
- Stated runout figure
- Works on four machine types
- Length not stated
- Only one capacity offered
- Drawbar details not given
Performance notes
Runout, shown as total indicator reading, measures how far the tool wobbles when spinning, and a smaller number gives truer cuts. The collet tightens by hand with a manual lock. Real accuracy also depends on a clean spindle taper.
Specifications
| Brand | Shars |
|---|---|
| Model | 202-5111 |
| Dimensions & fit | |
| Item weight | 12 ounces |
| Item Diameter | 0.38 inches |
| Thread Size | 7/16-20 UNF |
| Capacity & performance | |
| Capacity | 0.38 inches |
| Construction & materials | |
| Material Type | steel |
| Compatibility & installation | |
| Compatible Devices | Drilling Machine, Grinding Machine, Lathe, Milling Machine |
| Other details | |
| Handle Type | hand-tightened |
| Lock Type | Manual |
| TIR (runout) | 0.0006" |
Frequently asked questions
What shank size does the Shars 202-5111 R8 collet hold?
The listing gives a capacity of 0.38 inches, matching the 3/8 inch size in the title.
What thread does the Shars 202-5111 collet use?
A 7/16-20 UNF thread size is listed.
Will the Shars 202-5111 fit an ER spindle?
The title names an R8 collet, so the listing does not support use in an ER system.