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16IL10UNK20 - Carmex Thread Turning Internal Insert - UN (UNC,UNF,UNEF,UNS) - Left Hand
| Thread Type | Internal |
| Thread Direction | Left Hand |
| Thread Form | UN (UNC UNF UNEF UNS) |
| Pitch | 10 |
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Carmex Thread Turning Internal Insert (UN thread family: UNC, UNF, UNEF, UNS) Left Hand, part number 16IL10UNK20, is a versatile cutting solution for internal threading on a wide range of spigots and components. As part of our industry‑leading range of thread turning inserts, this laydown triangular design delivers reliable performance across a broad spectrum of thread standards, from straightforward projects to demanding applications.
- Broad thread standard coverage: Supports UNC, UNF, UNEF, and UNS internal threads in a single insert family, reducing tool changes and simplifying inventory for mixed projects.
- Left-hand threading readiness: Specifically engineered for left‑hand internal threads, ensuring consistent geometry and predictable results on LH workpieces.
- Triangular laydown design for stability: The laydown geometry promotes stable seating, smooth cutting performance, and repeatable thread quality across many materials and setups.
Used across workshops and production floors, this insert streamlines internal threading by providing one versatile solution that covers the most common UN thread standards. It helps you reduce downtime, accelerate setup, and maintain consistent thread quality from prototype runs to high‑volume production. Rely on Carmex's globally recognized manufacturing quality to deliver durable, repeatable results with every job.
Part Numbers
- Protool Part Number
- 16IL10UNK20
- 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.



