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Carmex Carbide Tiny Tool - Boring Bar - MTR - K20 Grade - 4.1mm Minimum Diameter x 10mm Reach x R0.2
| Application | Boring (MTR) |
| Minimum Diameter | 4.1 |
| Reach (L1) | 10 |
| Radius (R) | 0.2 |
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Description
The Carmex Carbide Tiny Tool is a solid carbide boring bar engineered for small-diameter bore work and general turning. With a 4.1 mm minimum diameter, a 10 mm reach, and a precise R0.2 radius at the tip, it enables clean, accurate holes in tight spaces. Built from MTR K20-grade carbide, this compact tool is ideal for engineers, machinists, and hobbyists who need dependable performance in demanding setups, including stainless steels.
Two advanced coating options power the Carmex Tiny Tool: the BXC - PVD TiN coated grade and the BMK - sub-micron grade with a triple PVD coating. The BXC TiN variant is optimized for low cutting speeds and stainless steels (ISO P30-P50 / K25-K40), delivering steady cuts and longer wear life. The BMK variant offers exceptional heat resistance with smooth cutting across a wide range of materials, making it a versatile general-purpose choice for tougher jobs.
- Coatings designed for stainless steels: BXC - PVD TiN coating provides reliable performance at low cutting speeds with strong wear resistance, helping extend tool life when machining stainless steels.
- High-heat, durable BMK triple-coated grade: Sub-micron carbide with advanced PVD triple coating delivers excellent heat tolerance and smooth cutting across diverse materials, enhancing reliability on challenging runs.
- Compact geometry for precise small bores: 4.1 mm minimum diameter, 10 mm reach, and R0.2 tip radius enable accurate, repeatable bores in tight spaces with consistent finishes.
This tiny carbide boring bar supports faster, more predictable workloads—from tight-tolerance components to maintenance work—by delivering consistent bore quality, reduced downtime, and fewer tool changes. The combination of robust MTR K20 carbide and specialized coatings translates to reliable performance across materials and applications, helping you complete demanding jobs with confidence and finish-quality you can trust.
Part Numbers
- Protool Part Number
- MTR4R0.2L10K20
- 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.
