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Carmex Thread Turning External Insert - UNJ (UNJC UNJF UNJEF UNJS) - Right Hand - 16ER16UNJK20
| Thread Type | External |
| Thread Direction | Right Hand |
| Thread Form | UNJ (UNJC UNJF UNJEF UNJS) |
| Pitch | 16 |
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Compatible holders
The ones our customers buy most.Description
Carmex Thread Turning External Insert – UNJ (Right Hand - 16ER16UNJK20) is optimized for UNJ thread turning and covers UNJC, UNJF, UNJEF, and UNJS standards. This laydown triangular insert is engineered to tackle a broad range of UNJ applications with a single tool solution, delivering consistent results across the spectrum.
Designed for engineers, machinists, and maintenance professionals, it simplifies setups and reduces tool changes by supporting multiple thread standards in one insert. It handles everything from basic to demanding thread profiles while maintaining reliable thread quality and surface finish.
- Wide UNJ Thread Compatibility: Designed to cover UNJC, UNJF, UNJEF, and UNJS, enabling you to tackle most UNJ threading tasks with one insert and minimizing tool changes.
- Right-Hand Cutting Geometry: Optimized for stable engagement and clean thread surfaces, with a laydown triangular geometry that supports smooth chip flow and reduced vibration.
- Versatile for Basic to Demanding Applications: Delivers consistent performance across simple and complex thread profiles, helping you complete jobs faster with fewer passes and less rework.
This combination of broad compatibility, stable cutting action, and versatile application coverage helps streamline threading operations. Expect smoother setups, more predictable thread quality, and improved productivity—so you can finish jobs on schedule with less downtime and less tool juggling.
Part Numbers
- Protool Part Number
- 16ER16UNJK20
- 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.



