Please log in here to access all benefits, including multibuy discounts and faster checkouts.

Carmex Thread Mills Solid Carbide - Internal & External Thread - NPTF - 2 1/2 + x 8 - MT7
| Thread Form | NPTF |
| Size | 2 1/2 + |
| Pitch | 8 |
| Diameter (D) | 20 |
| Flute Length (l) | 39.7 |
| Shank Diameter (d) | 20 |
Learn more about Klarna
The Carmex MT solid carbide thread mills are engineered to deliver precise internal and external threading with NPTF profiles, making them a reliable and cost-efficient choice for machine shops and job sites that demand consistent thread quality.
- Solid carbide construction: Built for high hardness and wear resistance, delivering long tool life across a range of materials.
- Internal & External threading: One tool handles both bore threading and external thread milling, simplifying setups and reducing tool changes.
- Multi-flute design (3–5 flutes): Optimizes cutting efficiency and chip evacuation to produce clean, accurate threads with stable performance.
- MT7 shank: Robust Morse taper shank for secure, rigid mounting on compatible milling machines, enhancing precision and rigidity.
- Size: 2 1/2 + x 8 (specifications as listed for this MT7 tool)
- Application focus: Ideal for threading applications such as pipe fittings, hydraulic components, and other parts requiring precise NPTF threads.
With the MT threading line, you gain a dependable, efficient solution that minimizes setup time while maximizing thread accuracy. The combination of a tough carbide body and a carefully engineered flute count supports consistent results across multiple passes, helping you reduce scrap and rework. The MT7 shank ensures a secure fit in your machine, promoting steady cuts and reliable tolerances whether you’re shaping internal holes or external threads for standard NPTF profiles. This tool is well-suited for shops that need a single, versatile threading solution for varied metals and production demands.
| Thread Form | NPTF |
| Size | 2 1/2 + |
| Pitch | 8 |
| Diameter (D) | 20 |
| Flute Length (l) | 39.7 |
| Shank Diameter (d) | 20 |
| No of Flutes | 4 |
| Overall Length (L) | 105 |
| Thread Mill Style | Standard |
| Internal or External | Internal & External |
| Coating | MT7 |
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 Solid Carbide Thread Mills - NPTF - For Internal & External Thread (MT)
View full collection →You are viewing MT2020D398NPTFMT7. Click any other SKU to view its full details.
| Product SKU | Size | Pitch | Flute Length | Reach | Overall Length | Price | Stock | Order |
|---|---|---|---|---|---|---|---|---|
| MT0606C927NPTFMT7 | 1/16 1/8 | 27 | 9.9 | 9.9 | 58 | £65.10 | In Stock | |
| MT0808C1418NPTFMT7 | 1/4 3/8 | 18 | 14.8 | 14.8 | 64 | £86.72 | 5 days | |
| MT1212D2014NPTFMT7 | 1/2 3/4 | 14 | 20.9 | 20.9 | 84 | £125.18 | 5 days | |
| MT1616D2711.5NPTFMT7 | 1 - 2 | 11.5 | 27.6 | 27.6 | 105 | £147.68 | 5 days | |
| MT2020D398NPTFMT7 Viewing | 2 1/2 + | 8 | 39.7 | 39.7 | 105 | £178.34 | In Stock |
No products match your filters.








