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Carmex Thread Turning External Insert - UN (UNC,UNF,UNEF,UNS) - Right Hand - 27ER4UNK20
| Thread Type | External |
| Thread Direction | Right Hand |
| Thread Form | UN (UNC UNF UNEF UNS) |
| Pitch | 4 |
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Description
Carmex Thread Turning External Insert - UN (UNC, UNF, UNEF, UNS) - Right Hand - 27ER4UNK20 is an external thread turning insert engineered for right-hand threads across UNC, UNF, UNEF, and UNS standards. It is part of our industry-leading range of thread turning inserts known worldwide for versatility and dependable performance.
The triangular laydown geometry supports efficient engagement and chip control across a broad range of materials, from everyday threading tasks to more demanding jobs.
- Broad thread standard compatibility: Designed to cover UNC, UNF, UNEF, and UNS external threads, this insert lets you tackle multiple thread forms with a single tool, reducing setup time and streamlining your shop’s tooling needs.
- Triangular laydown geometry for stable cutting: The laydown triangular design promotes smooth engagement and effective chip flow, helping deliver clean thread profiles with consistent results across various materials.
- Reliable performance for basic to demanding tasks: Built to handle a wide range of applications—from routine threading to more challenging jobs—providing steady tool life and dependable results over time.
This insert is a practical, all-in-one solution for shops and on-site teams that need reliable external threading across multiple standards. It supports a steady workflow, minimizes interruptions, and helps ensure consistent thread quality on every part.
Part Numbers
- Protool Part Number
- 27ER4UNK20
- 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.
