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Carmex Carbide Tiny Tool - Boring Bar - MTL - K20 Grade - 4.1mm Minimum Diameter x 15mm Reach x R0.2 (Left Hand)
| Application | Boring (MTL) |
| Minimum Diameter | 4.1 |
| Reach (L1) | 15 |
| Radius (R) | 0.2 |
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Description
The Carmex Carbide Tiny Tool - Boring Bar is a compact, solid carbide bar designed for small-diameter boring and general turning. Built in a K20 grade with a 4.1 mm minimum diameter and a 15 mm reach, it features a left‑hand geometry and a precise R0.2 nose radius to deliver clean, consistent finishes in tight bores and pockets. Ideal for engineers, machinists, and hobbyists, this tool makes delicate boring tasks reliable and repeatable.
- Tiny-diameter, long-reach boring capability: 4.1 mm minimum diameter and 15 mm reach with a precise R0.2 nose radius enable accurate, stable cutting in tight bores and shallow pockets. Left-hand configuration supports compatible setups.
- Coating options for optimized performance: Choose BXC for low-cutting-speed work on a wide range of stainless steels (ISO P30-P50 / K25-K40) with PVD TiN coating, or BMK for high-heat resistance and smooth cutting across materials (ISO K10-K20) with advanced PVD triple coating.
- Rigid carbide construction for reliability: Solid carbide construction provides stiffness and wear resistance, delivering consistent results and long tool life in demanding boring and turning applications.
This tiny boring bar is designed to simplify precision work in small bores while offering versatile performance across materials. The two coating grades let you tailor speed, heat tolerance, and finish quality to your specific job, helping you reduce downtime, improve surface finishes, and maintain steady productivity in your workshop or production line.
Part Numbers
- Protool Part Number
- MTL4R0.2L15K20
- 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.
