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Carmex Carbide Tiny Tool - Boring Bar - MTR - K20 Grade - 5.1mm Minimum Diameter x 40mm Reach x R0.2
| Application | Boring (MTR) |
| Minimum Diameter | 5.1 |
| Reach (L1) | 40 |
| Radius (R) | 0.2 |
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Description
The Carmex Carbide Tiny Tool Boring Bar is a compact, K20-grade solid carbide tool designed for precise boring and dependable turning. Ideal for engineers, machinists, and hobbyists, its small 5.1 mm minimum diameter, 40 mm reach, and R0.2 nose radius enable clean, accurate holes in tight spaces.
- Compact, precise boring bar for tight bores: With a 5.1 mm minimum diameter and 40 mm reach, this tool fits into confined cavities and long holes, reducing the need for multiple setups.
- Nose geometry for smooth finishes: The R0.2 nose radius delivers controlled chip flow and consistent surface finish with minimal chatter, even in small-diameter work.
- Coated carbide for versatile material compatibility: Choose from BXC TiN-coated grade for low-speed cutting in stainless steels (ISO P30-P50 / K25-K40) or BMK sub-micron grade with advanced PVD triple coating for high heat resistance and broad applicability (ISO K10-K20).
Designed to streamline workflows, the Carmex Tiny Tool helps you punch through small-diameter work with fewer setups and consistent results. The carbide core combined with specialized coatings delivers durable wear resistance and steady cutting performance, so you spend less time reworking parts and more time finishing projects to spec.
Part Numbers
- Protool Part Number
- MTR5R0.2L40K20
- 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.
