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Carmex Carbide Tiny Tool - Boring Bar - MTR - K20 Grade - 5.1mm Minimum Diameter x 15mm Reach x R0.05
| Application | Boring (MTR) |
| Minimum Diameter | 5.1 |
| Reach (L1) | 15 |
| Radius (R) | 0.05 |
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Description
The Carmex Carbide Tiny Tool Boring Bar is a compact, solid carbide tool designed for precise boring and versatile turning tasks. With a 5.1 mm minimum boring diameter, 15 mm reach, and a nose radius of R0.05, it enables accurate holes in tight spaces. Built on the MTR K20 grade, this tiny tool offers coating options to optimize performance across stainless steels and general materials.
- Coated for low-speed stainless steel work: The BXC PVD TiN coating is designed for low cutting speeds and broad stainless steel compatibility (ISO P30-P50 / K25-K40), reducing wear and helping you achieve consistent finishes.
- BMK sub-micron grade with triple coating: BMK uses advanced PVD triple coating for exceptional heat resistance and smooth cutting, providing reliable performance across demanding materials (ISO K10-K20).
- Compact, precise geometry for tight bores: With a 5.1 mm minimum diameter, 15 mm reach, and an R0.05 nose radius, this tool delivers accurate, clean holes in confined spaces while minimizing finishing passes.
This combination of compact size, reliable carbide construction, and coating choices helps you complete boring and general turning tasks more efficiently. The tool’s wear-resistant coatings and high-heat performance translate to longer tool life, fewer changes, and more predictable results across a variety of materials, making it a dependable choice for engineers, machinists, and hobbyists alike.
Part Numbers
- Protool Part Number
- MTR5R0.05L15K20
- 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.
