Please log in here to access all benefits, including promotional discounts and faster checkouts.
16IL28UNK20 - 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 | 28 |
Learn more about Klarna
Compatible holders
The ones our customers buy most.
Description
Carmex Thread Turning Internal Insert – UN (UNC, UNF, UNEF, UNS) - Left Hand - 16IL28UNK20 is part of Carmex’s industry-leading range of thread turning inserts. This internal threading solution uses a laydown triangular insert geometry to cover the UN set of thread standards with a single tool, delivering reliable, accurate internal threads across a wide variety of bore sizes.
Designed for engineers, machinists, buyers and hobbyists alike, it handles everything from basic to demanding threading tasks with consistent results. The left-hand orientation expands its versatility in practical manufacturing and repair applications, while the renowned Carmex quality underpins dependable performance every shift.
- Broad UNC/UNF/UNEF/UNS compatibility: One insert covers UNC, UNF, UNEF, and UNS internal threads, reducing tool changes and simplifying inventory.
- Laydown triangular geometry for stable cutting: The triangular, laydown shape provides stable engagement, smooth chip formation, and consistent thread profiles for reliable results.
- Left‑hand orientation for versatile threading: Supports left-hand threads and flexible setups, enabling efficient production without tool changes or reconfigurations.
By providing a versatile, reliable internal threading solution that covers multiple thread standards, this insert helps you streamline setups, reduce downtime, and achieve consistent thread quality across a range of materials and component sizes. Whether building standard fasteners or custom parts, you’ll experience smoother operations, fewer reworks, and predictable results with Carmex craftsmanship behind every thread.
Part Numbers
- Protool Part Number
- 16IL28UNK20
- 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.
