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Carmex Carbide Tiny Tool - Boring Bar - MTL - K20 Grade - 5.1mm Minimum Diameter x 22mm Reach x R0.2 (Left Hand)
| Application | Boring (MTL) |
| Minimum Diameter | 5.1 |
| Reach (L1) | 22 |
| Radius (R) | 0.2 |
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The Carmex Carbide Tiny Tool – Boring Bar is a solid carbide bar built for precision small-diameter work. It’s designed primarily for boring but also capable of handling general turning tasks, delivering dependable, repeatable results in tight spaces. The tool is offered in MTL with K20-grade carbide, providing a rigid core that helps maintain accuracy through multiple passes.
- Dual coating options for versatile, high‑quality cuts: Choose BXC TiN for low cutting speeds and broad stainless steel performance (ISO P30–P50 / K25–K40), or BMK with a sub‑micron, triple‑coated finish for exceptional heat resistance and smooth cutting across a wide range of materials.
- Compact bore geometry for tight pockets: With a 5.1 mm minimum diameter, 22 mm reach, and a left‑hand R0.2 nose, it reaches into narrow bores and maintains consistent engagement for precise depth control.
- Durable carbide core with protective coatings: The solid carbide core delivers rigidity and wear resistance, while the advanced coatings minimize wear and heat buildup to support reliable performance across materials and over extended use.
This tiny tool is built to streamline your workflow: it handles boring and general turning in small-diameter components with stable cuts, predictable finishes, and minimal tool changes. The combination of the K20-grade carbide and specialized coatings helps you achieve repeatable bore accuracy, faster cycle times, and extended tool life in a wide range of materials, including stainless steels.
Part Numbers
- Protool Part Number
- MTL5R0.2L22K20
- 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.



