Please log in here to access all benefits, including promotional discounts and faster checkouts.
No. 4 x 40 TPI UN Internal Thread Mill 3.5xD – Carmex MTI 03021 C10 40 UN MT11
| Thread Form | UN (UNC UNF UNEF UNS) |
| Size | No. 4 |
| Pitch | 40 |
| Diameter (D) | 2.1 |
Learn more about Klarna
Description
Solid carbide thread mill for internal No. 4 x 40 TPI UN threads. MTI tools are made for threading deep parts. The short profile keeps cutting forces low.
This is an internal-only thread mill, and Carmex doesn’t list it for external threads. MT11 is ultra-fine sub-micron carbide with Carmex’s blue PVD triple coating, for hardened steel, stainless and super alloys. Carmex rates this tool for material up to 62 HRc.
- Carmex code: MTI 03021 C10 40 UN MT11
- Thread: No. 4 x 40 TPI, UN – UNC/UNF/UNEF/UNS
- Cutting diameter: Ø2.10 mm
- Flutes: 3
- Cutting length: 10.1 mm
- Overall length: 39 mm
- Shank: Ø3 mm
- Max thread depth: 3.5×D1 (× nominal diameter)
- Grade: MT11 – PVD triple-coated ultra-fine carbide
Part Numbers
- Protool Part Number
- MTI03021C1040UNMT11
- Brand
- Carmex
- Category
- Thread Mill
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.
Full Range: Carmex Carbide Thread Mills - UN - Mini Type For Internal Thread (MTI)
View full collection →You are viewing MTI03021C1040UNMT11. Click any other SKU to view its full details.
| Product SKU | Size | Pitch | Flute Length | Reach | Shank Diameter | Overall Length | Price | Stock | Order |
|---|---|---|---|---|---|---|---|---|---|
| MTI03012C580UNMT11 | No. 0 | 80 | N/A | 5.5 | 3 | 39 | £95.44 | 5 days | |
| MTI03015C772UNMT11 | No. 1 | 72 | 1.06 | 6.6 | 3 | 39 | £95.44 | 5 days | |
| MTI03016C956UNMT11 | No. 2 No. 3 | 56 | N/A | 8.9 | 3 | 39 | £95.44 | 5 days | |
| MTI03021C1040UNMT11 Viewing | No. 4 | 40 | 1.91 | 10.1 | 3 | 39 | £95.44 | 5 days |
No products match your filters.
