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Carmex Carbide Tiny Tool - Boring Bar - MTR - K20 Grade - 3.1mm Minimum Diameter x 15mm Reach x R0.05
| Application | Boring (MTR) |
| Minimum Diameter | 3.1 |
| Reach (L1) | 15 |
| Radius (R) | 0.05 |
| Grade | K20 |
| Holder | SIM****H3 |
Learn more about Klarna
Carmex Carbide Tiny Tool is a compact carbide boring bar designed for precision in small-diameter workpieces. It’s ideal for machinists, engineers, tradespeople, and hobbyists who need clean, accurate bores in tight spaces, delivering dependable performance in demanding applications.
With a 3.1 mm minimum diameter, a 15 mm reach, and a nose radius of R0.05, this tool excels at producing precise bores in confined cavities and can also handle light turning tasks. The carbide family offers two coating options to suit different materials and speeds: BXC TiN for low cutting speeds on stainless steels (ISO P30-P50 / K25-K40) and BMK with a sub-micron grade plus triple PVD coating for high heat resistance and smooth cutting across a wide range of materials (ISO K10-K20).
- Tiny-diameter precision for tight bores: 3.1 mm minimum diameter, 15 mm reach, and R0.05 nose radius enable tight tolerances and clean finishes in small parts.
- Coatings engineered for durability across materials: BXC TiN supports low-speed cutting on stainless steels for consistent wear performance; BMK’s triple PVD coating delivers high heat resistance and smoother cutting across a broad material range.
- Rugged carbide design for reliable, versatile performance: Solid carbide construction provides rigidity for boring and can handle light turning, delivering predictable results with reduced downtime.
This Tiny Tool delivers a compact, reliable solution for precision bores in tight spaces, while its dual coating options help you push faster cycles and maintain surface finish across common materials like stainless steels. Built from solid carbide, it offers the durability and stability you need for demanding applications in CNC or manual machining.
| Application | Boring (MTR) |
| Minimum Diameter | 3.1 |
| Reach (L1) | 15 |
| Radius (R) | 0.05 |
| 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.
