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16EL11UNK20 - Carmex Thread Turning External Insert - UN (UNC,UNF,UNEF,UNS) - Left Hand
| Thread Type | External |
| Thread Direction | Left Hand |
| Thread Form | UN (UNC UNF UNEF UNS) |
| Pitch | 11 |
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Description
Carmex Thread Turning External Insert for UN (UNC, UNF, UNEF, UNS) – Left Hand – 16EL11UNK20 is a versatile external threading insert engineered to handle left-hand applications with consistent, reliable results. Its laydown triangular geometry is designed to perform across a broad spectrum of thread standards, making it a practical choice for mixed shops and production environments.
Whether you're upgrading tooling or setting up a new production line, this insert covers the most common UNC/UNF/UNEF/UNS threads with a single, dependable solution. It helps reduce tool changes and inventory, while delivering predictable thread profiles and smooth finishes on a wide range of materials.
- Broad UNC/UNF/UNEF/UNS compatibility: Accepts the major external thread forms, enabling you to tackle most common thread types with one insert and minimize tool swaps.
- Left-hand threading optimized design: Specifically engineered for external left-hand threads, delivering stable cutting action, clean thread starts, and easier setup.
- Durable laydown triangular geometry: Robust insert geometry that supports longer edge life and consistent performance from basic jobs to demanding applications.
This insert helps you maintain steady productivity by reducing setup time, lowering tool-change frequency, and ensuring reliable, repeatable thread quality across production runs and repairs alike.
Part Numbers
- Protool Part Number
- 16EL11UNK20
- 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.
