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Carmex Carbide Tiny Tool - Boring Bar - MTR - K20 Grade - 5.1mm Minimum Diameter x 30mm Reach x R0.1
| Application | Boring (MTR) |
| Minimum Diameter | 5.1 |
| Reach (L1) | 30 |
| Radius (R) | 0.1 |
| Grade | K20 |
| Holder | SIM****H5 |
Learn more about Klarna
The Carmex Carbide Tiny Tool is a precision solid carbide boring bar designed for tight bores and delicate turning tasks. Built in the MTR family with K20 grade, this compact tool is as versatile as it is capable, making it suitable for engineers, technicians, and hobbyists alike.
With a 5.1 mm minimum diameter, 30 mm reach, and an R0.1 tip radius, it delivers accurate starts and clean finishes in confined spaces, while still handling general turning jobs when needed.
- Compact tiny-tool geometry for tight bores: Designed for tight internal work, the 5.1 mm diameter, 30 mm reach, and R0.1 radius help you maintain precise bore size and smooth finishes in restricted cavities.
- Coating options for versatile performance: Choose BXC TiN coating for low cutting speeds and good results with a wide range of stainless steels (ISO P30–P50 / K25–K40), or BMK sub-micron coating with a triple PVD layer for high heat resistance and smooth cutting across many materials.
- Rigid carbide construction for durability: Solid carbide builds deliver wear resistance and dimensional stability, supporting reliable, repeatable results across boring and general turning tasks.
Together, these features help you complete small-diameter boring and turning tasks more efficiently, with dependable tool life, predictable finishes, and material-ready performance. The dual coating options let you tailor the tool to your material and cutting conditions, while the tight geometry ensures consistent results in confined bores and deep features.
| Application | Boring (MTR) |
| Minimum Diameter | 5.1 |
| Reach (L1) | 30 |
| Radius (R) | 0.1 |
| Grade | K20 |
| Holder | SIM****H5 |
| L | 76 |
| F | 2.1 |
| D | 5 |
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.
