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11EL28UNBMA - Carmex Thread Turning External Insert - UN (UNC,UNF,UNEF,UNS) - Left Hand
| Thread Type | External |
| Thread Direction | Left Hand |
| Thread Form | UN (UNC UNF UNEF UNS) |
| Pitch | 28 |
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Description
Carmex Thread Turning External Insert – UN (UNC, UNF, UNEF, UNS) - Left Hand, 11EL28UNBMA is an external threading insert designed for precise, reliable thread formation on lathes and turning centers. Built to handle a wide range of Unified thread standards, it uses a laydown triangular geometry that provides stable cutting and consistent results, even on left-handed threads.
Ideal for engineers, machinists, and maintenance teams, this insert offers a versatile solution for both basic and demanding threading tasks. The 11EL28UNBMA designation identifies a geometry optimized for broad compatibility with UNC, UNF, UNEF, and UNS threads, reducing tool changes and simplifying stocking for mixed-thread jobs. The central mounting hole and precise geometry support secure seating and clean, repeatable cuts.
- Broad thread-standard compatibility: Covers UNC, UNF, UNEF, and UNS thread forms, reducing the need for multiple inserts and improving setup efficiency on mixed jobs.
- Left-hand threading optimized: Specifically designed for left-handed threads, delivering reliable cutting action and consistent thread profiles across runs.
- Secure mounting with central hole: Features a central mounting hole for stable seating in compatible holders, helping ensure clean, repeatable cuts.
With this insert, you gain a versatile, dependable tool for a wide range of threading tasks. Its universal thread-form coverage and left-hand orientation deliver consistent results from basic to demanding applications, supporting smoother workflows and confident production.
Part Numbers
- Protool Part Number
- 11EL28UNBMA
- 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.
