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Carmex Carbide Tiny Tool - Boring Bar - MTR - K20 Grade - 4.1mm Minimum Diameter x 22mm Reach x R0.2
| Application | Boring (MTR) |
| Minimum Diameter | 4.1 |
| Reach (L1) | 22 |
| Radius (R) | 0.2 |
| Grade | K20 |
| Holder | SIM****H4 |
Learn more about Klarna
Carmex Carbide Tiny Tool is a compact boring bar crafted from solid carbide, designed for precise small-diameter bore work and reliable general turning. With a 4.1 mm minimum diameter, a 22 mm reach, and a nose radius of R0.2, this tool accesses tight spaces and delivers clean starts in confined areas.
As part of Carmex’s carbide bar lineup, it offers two high-performance coating options to suit different materials and cutting speeds. The BXC grade uses a PVD TiN coating optimized for low cutting speeds and excels with a wide range of stainless steels (ISO P30–P50 / K25–K40), delivering longer tool life and smoother finishes. The BMK grade features a sub-micron structure with a triple PVD coating (ISO K10–K20), providing exceptionally high heat resistance for maximum performance and smooth cutting across tougher materials. The underlying MTR material is K20 grade, offering rigidity and wear resistance for consistent results.
- Coating options for versatile materials: BXC TiN coating enhances life and finish on stainless steels at low speeds, while BMK’s triple PVD coating delivers outstanding heat resistance for demanding jobs, giving you dependable performance across a broad material range.
- Tiny geometry for tight bores: 4.1 mm minimum diameter, 22 mm reach, and R0.2 nose radius enable precise entry and finishing passes in restricted spaces and delicate setups.
- Rugged carbide core for durability: Built on MTR–K20 grade, this tool delivers stiffness and wear resistance for repeatable cuts and long tool life across multiple projects.
This tiny boring bar combines compact size, purpose-built coatings, and a tough carbide core to streamline workflows, improve bore accuracy, and extend tool life. Whether you’re refining small-diameter bores, performing precise finishing cuts, or tackling general turning tasks, you can rely on consistent performance and predictable results from first cut to last.
| Application | Boring (MTR) |
| Minimum Diameter | 4.1 |
| Reach (L1) | 22 |
| Radius (R) | 0.2 |
| 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.
