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16EL12UNJK20 - Carmex Thread Turning External Insert - UNJ (UNJC UNJF UNJEF UNJS) - Left Hand
| Thread Type | External |
| Thread Direction | Left Hand |
| Thread Form | UNJ (UNJC UNJF UNJEF UNJS) |
| Pitch | 12 |
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Description
The Carmex Thread Turning External Insert is a left-hand, external threading tool designed to work across UNJ thread standards (UNJC, UNJF, UNJEF, UNJS). Its laydown triangular geometry provides versatile performance across a broad range of thread turning tasks, enabling a single insert to handle multiple standards.
Designed for both basic and demanding machining, it helps you produce clean, accurate threads with fewer tool changes and smoother cycle times. Part number 16EL12UNJK20.
- Broad UNJ compatibility across UNJC, UNJF, UNJEF, and UNJS: Lets you tackle many thread turning jobs with one insert, reducing setup time and inventory needs.
- Left-hand threading optimized: Specifically engineered for left-hand threads to deliver stable cutting action and consistent thread quality.
- Laydown triangular geometry for smooth cuts: Provides stable engagement, reduces chatter, and supports reliable chip control across a wide range of materials and applications.
This combination of compatibility, specialized threading support, and proven geometry helps you streamline threading workflows, save time on setup and changes, and achieve dependable results from first pass to final finish.
Part Numbers
- Protool Part Number
- 16EL12UNJK20
- 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.
