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Carmex Thread Turning External Insert - UN (UNC,UNF,UNEF,UNS) - Left Hand - 11EL40UNBMA
| Thread Type | External |
| Thread Direction | Left Hand |
| Thread Form | UN (UNC UNF UNEF UNS) |
| Pitch | 40 |
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Description
The Carmex Thread Turning External Insert – Left Hand for UN thread standards (UNC, UNF, UNEF, UNS) is designed to deliver reliable external threading across a wide range of projects. Perfect for machinists, toolrooms, and production shops, this insert provides a versatile solution that covers the common UN thread profiles in a single tool option.
Built for left-hand threading, this insert supports reverse-turn operations with stable engagement and consistent results. Its triangular laydown geometry promotes smooth cutting action, helping you achieve clean, accurate thread profiles from simple prototypes to demanding production runs.
- Broad UN thread compatibility: Handles UNC, UNF, UNEF, and UNS external threads so you can work across multiple standards without swapping inserts.
- Left-hand threading support: Optimized for left-hand threads, delivering reliable performance in reverse-turn applications.
- Triangular laydown geometry: Provides stable engagement and smooth cutting action for consistent thread quality across a wide range of materials and applications.
With a design that covers the major UN thread standards in one dependable insert, you can streamline setups, reduce tool changes, and maintain steady throughput. The left-hand capability paired with a robust triangular geometry supports predictable results, helping you finish jobs faster with fewer adjustments and rework.
Part Numbers
- Protool Part Number
- 11EL40UNBMA
- Brand
- Carmex
- Category
- Thread Turning
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.
