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Carmex Carbide Tiny Tool - Boring Bar - MTR - K20 Grade - 2.1mm Minimum Diameter x 10mm Reach x R0
| Application | Boring (MTR) |
| Minimum Diameter | 2.1 |
| Reach (L1) | 10 |
| Radius (R) | 0 |
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Description
Carmex Carbide Tiny Tool - Boring Bar (MTR, K20 Grade) is a compact solid carbide bar designed for precise internal bores in small-diameter parts. With a 2.1 mm minimum diameter, 10 mm reach, and a near-zero radius tip (R0), it excels at boring and light turning in tight spaces. The tool line offers two coating grades—BXC (PVD TiN) for low cutting speeds on stainless steels, and BMK (sub-micron, triple-coated) for high-heat performance across a broad material range.
- Micro-diameter bore capability: 2.1 mm minimum diameter and 10 mm reach enable accurate internal features in small parts, with stable engagement and minimal overhang for consistent results.
- Coating options for optimized performance: Choose BXC TiN for smooth cutting at lower speeds on stainless steels (ISO P30-P50 / K25-K40) or BMK’s sub-micron, triple-coated design for maximum heat resistance and versatile material compatibility.
- Zero-radius tip for precise finishes: The R0 nose delivers sharp, clean corners in bores, reducing secondary operations and improving surface quality on tight tolerances.
This tiny carbide boring bar is built for reliability in busy shops and demanding projects. Its robust carbide body, paired with purpose-built coatings, helps extend tool life, minimize downtime, and deliver repeatable results across stainless steels and other alloys. Whether you’re prototyping or ramping to production, you’ll appreciate the consistent performance, easy setup, and confident finishes this tool provides in compact internal features and small-diameter turning tasks.
Part Numbers
- Protool Part Number
- MTR2R0L10K20
- Brand
- Carmex
- Category
- Tiny Tool Inserts
Delivery
Free UK mainland delivery on orders over £50 ex VAT. In-stock items ordered before 4:30pm are dispatched the same working day. Full delivery information.
Returns
14-day returns on unused stock items in original packaging. Special-order and bespoke tooling is non-returnable. Read our returns policy.
Technical Support
Over 30 years of machining experience behind the counter. Call 01732 887334, Mon–Thurs 8:30–17:30, Fri 8:30–16:30.
Trade Accounts
Credit accounts, contract pricing and scheduled call-off orders available for trade customers. Apply for an account.
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.
