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Carmex Carbide Tiny Tool - Boring Bar - MTR - K20 Grade - 3.1mm Minimum Diameter x 10mm Reach x R0.1
| Application | Boring (MTR) |
| Minimum Diameter | 3.1 |
| Reach (L1) | 10 |
| Radius (R) | 0.1 |
| Grade | K20 |
| Holder | SIM****H3 |
Learn more about Klarna
The Carmex Carbide Tiny Tool - Boring Bar is a compact solid carbide tool designed for precision small-diameter boring and reliable general turning. It’s built for engineers, buyers, tradespeople, hobbyists, and non-technical customers alike, delivering clean hole quality in tight spaces.
- Tiny-diameter bore capability: Precisely bore in confined areas with a 3.1 mm minimum diameter, 10 mm reach, and an R0.1 corner radius. This compact geometry minimizes tool deflection and yields consistent hole quality in tight pockets and shafts.
- Coating options for durability and versatility: Choose between BXC TiN coating for low cutting speeds and stainless steels (ISO P30-P50 / K25-K40) or BMK sub-micron grade with a triple PVD coating for high heat resistance (ISO K10-K20) and smoother cutting. Coatings extend tool life across a broad range of materials.
- Solid carbide for reliable performance: Made from a solid carbide bar that delivers excellent wear resistance and stable cutting. The coated surface minimizes built-up edge and chatter, helping you achieve repeatable results in demanding machining tasks.
This tiny boring bar enables tighter tolerances and smoother finishes in small bores while reducing downtime through longer tool life. Its precise geometry, combined with coating options and durable carbide construction, makes it a dependable choice for managing tight spaces, challenging stainless steels, and general turning applications with confidence.
| Application | Boring (MTR) |
| Minimum Diameter | 3.1 |
| Reach (L1) | 10 |
| Radius (R) | 0.1 |
| Grade | K20 |
| Holder | SIM****H3 |
| L | 39 |
| F | 1.3 |
| D | 3 |
What time are Protool open?
We are open Monday to Friday between 8:30am and 5pm.
Do you offer Free Next Day delivery?
Yes! We offer Free Next Day delivery via Royal Mail Tracked 24 on all orders over £50 ex VAT*. We also offer Free DPD Local Next Day delivery on all orders over £100 ex VAT*.
We also offer the following:
- Royal Mail Tracked 24 — £5.90 (FREE on orders over £50 ex VAT*). Order before 4:30pm for next day delivery. No signature required.
- DPD Local Next Day — £8.00 (FREE on orders over £100 ex VAT*). Standard next day delivery to UK mainland addresses.
- Royal Mail Special Delivery — £12.50. Guaranteed delivery before 1pm the next working day.
- DPD Saturday Delivery — £25.00. Must be ordered on Friday before 4pm. Pre-12pm delivery.
For delivery to Scottish Highlands & Islands, Northern Ireland, Republic of Ireland, or overseas locations, additional charges apply. Please see our delivery page for full details, or call us on 01732 887 334.
*T's & C's and exclusions apply. Please see our delivery page for more information on all our services.
