Please log in here to access all benefits, including promotional discounts and faster checkouts.


Carmex Thread Turning External Insert - UNJ (UNJC UNJF UNJEF UNJS) - Right Hand - 16ER11UNJK20
| Thread Type | External |
| Thread Direction | Right Hand |
| Thread Form | UNJ (UNJC UNJF UNJEF UNJS) |
| Pitch | 11 |
Learn more about Klarna
Compatible holders
The ones our customers buy most.Description
The Carmex Thread Turning External Insert is a versatile right-hand tool designed for external UNJ thread turning. Its laydown triangular geometry, coupled with compatibility across UNJC, UNJF, UNJEF, and UNJS standards (model 16ER11UNJK20), covers a broad range of threading tasks—from routine to demanding—with a single, reliable solution.
- Broad UNJ compatibility: Supports UNJ standards including UNJC, UNJF, UNJEF, and UNJS, enabling you to complete most threading jobs with one insert and reducing tool changes and inventory complexity.
- Right-hand external threading design: Optimized for right-hand threads, providing smooth, predictable thread formation and consistent results in everyday workshop conditions.
- Laydown triangular geometry for stable cutting: The triangular laydown geometry promotes stable cutting, efficient chip control, and a consistent thread finish across a wide range of materials.
With Carmex 16ER11UNJK20, you gain a dependable, flexible threading solution that simplifies inventory, reduces tool changes, and delivers consistent, defined threads across a broad range of materials and applications.
Part Numbers
- Protool Part Number
- 16ER11UNJK20
- 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.



