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Carmex Carbide Tiny Tool - Boring Bar - MTR - K20 Grade - 4.1mm Minimum Diameter x 10mm Reach x R0.1
| Application | Boring (MTR) |
| Minimum Diameter | 4.1 |
| Reach (L1) | 10 |
| Radius (R) | 0.1 |
| Grade | K20 |
| Holder | SIM****H4 |
Learn more about Klarna
The Carmex Carbide Tiny Tool is a compact solid carbide boring bar designed for precise small-diameter bores and versatile turning work. With a 4.1 mm minimum diameter, 10 mm reach, and a tiny R0.1 corner radius, it fits into tight spaces to deliver clean, accurate holes. Built for engineers, machinists, tradespeople, and hobbyists, it provides dependable performance where space and accuracy matter most.
This model uses the BMK K20-grade substrate with advanced PVD coatings, engineered for high heat resistance and smooth cutting across a wide range of materials. While primarily intended for boring, it also handles general turning tasks, making it a reliable choice for shops that need one tool to cover multiple operations.
- Compact bore geometry: 4.1 mm minimum diameter, 10 mm reach, and R0.1 radius enable access to tight bores and maintain consistent hole quality in confined spaces.
- BMK K20-grade with triple PVD coating: Sub-micron grain structure plus advanced coatings deliver excellent wear resistance and heat tolerance for a longer tool life and reliable cutting performance.
- Versatile for boring and turning: Optimized for boring yet capable of handling general turning tasks, reducing tool changes and increasing workflow flexibility in mixed-operation environments.
This combination of precise geometry, robust coating, and multi‑use capability helps you achieve repeatable hole sizes, smoother finishes, and longer tool life. It supports faster setups, fewer tool changes, and improved overall productivity on tight-tolerance projects.
| Application | Boring (MTR) |
| Minimum Diameter | 4.1 |
| Reach (L1) | 10 |
| Radius (R) | 0.1 |
| Grade | K20 |
| Holder | SIM****H4 |
| L | 51 |
| F | 1.7 |
| D | 4 |
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.
