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Carmex Carbide Tiny Tool - Boring Bar - MTR - K20 Grade - 4.1mm Minimum Diameter x 22mm Reach x R0.05
| Application | Boring (MTR) |
| Minimum Diameter | 4.1 |
| Reach (L1) | 22 |
| Radius (R) | 0.05 |
| Grade | K20 |
| Holder | SIM****H4 |
Learn more about Klarna
Carmex Carbide Tiny Tool – Boring Bar, built on MTR K20-grade solid carbide, is a compact solution for precision boring and light turning. With a 4.1 mm minimum diameter, a 22 mm reach, and a precise R0.05 nose radius, it delivers clean, repeatable cuts in small-diameter bores and intricate features. This tool is designed to cover a range of materials and operations, from stainless steels to general turning tasks.
- Compact bore geometry for tight work: Designed for small-diameter bores, its 4.1 mm minimum diameter, 22 mm reach, and R0.05 nose radius deliver accurate, consistent results in confined spaces.
- Coating options for versatile material support: BXC is a PVD TiN-coated grade optimized for low cutting speeds and stainless steels (ISO P30-P50 / K25-K40). BMK is a sub-micron grade with a triple PVD coating for high heat resistance and smooth cutting across materials (ISO K10-K20).
- Rigid carbide construction for durability: Solid carbide core provides rigidity and wear resistance, delivering steady performance and longer tool life in demanding boring and turning applications.
This Tiny Tool helps you achieve reliable, high-quality holes with minimal setup and consistent results across multiple materials. The coated carbide options manage heat and wear for extended tool life, while the compact form factor fits into tight bores without compromising cutting performance. Ideal for production runs, precision prototyping, and maintenance work where dependable boring and turning performance matters.
| Application | Boring (MTR) |
| Minimum Diameter | 4.1 |
| Reach (L1) | 22 |
| Radius (R) | 0.05 |
| 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.
