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Carmex Thread Mills Solid Carbide - Internal & External Thread - NPT - 2 1/2 + x 8 - MT7

SKU:MT2020D398NPTMT7

Carmex MT Thread Mills deliver precise internal and external threading in a solid carbide tool designed for CNC mills. Built for shops that demand reliable, cost‑effective NPT threads, these mill... Read more ↓
P
M
K
N
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Thread FormNPT
Size2 1/2 +
Pitch8
Diameter (D)20
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£237.79
Prices shown ex. VAT
In Stock— only 1 left
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Free delivery over £50 ex VAT
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14-day returns
30+ years expertise
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01732 887334
Mon – Thurs 8:30 – 17:30 · Fri 8:30 – 16:30

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Description

Carmex MT Thread Mills deliver precise internal and external threading in a solid carbide tool designed for CNC mills. Built for shops that demand reliable, cost‑effective NPT threads, these mills combine robust rigidity with efficient cutting performance.

  • Material: Solid carbide construction provides exceptional rigidity and wear resistance for demanding threading tasks.
  • Threading capability: Cuts both internal and external threads, including NPT profiles, in a single setup.
  • Flute count: Optimized with 3–5 flutes to balance strength, chip evacuation, and thread form quality.
  • Size and compatibility: 2.5 in diameter with MT7 shank for compatibility with standard CNC spindles and toolholders.
  • Design efficiency: Specialized flute geometry reduces cutting forces and improves thread quality and cycle efficiency.

This tool enables accurate NPT threading in a range of metals without swapping between taps or separate tooling. The MT7 shank integrates smoothly with common CNC setups, helping minimize downtime from tool changes. With a multi‑flute design and carbide construction, you’ll achieve clean thread forms, better surface finish, and longer tool life on production runs. Ideal for manufacturing valve bodies, hydraulic fittings, piping adapters, and other components that require dependable NPT threads.

Part Numbers

Protool Part Number
MT2020D398NPTMT7
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.

Ask our technical team about this tool

Not sure if this is the right tool for your job? Ask us about speeds and feeds, material suitability, holders or alternatives — 30+ years of machining experience on the other end.

Prefer to talk? Call 01732 887334 — Mon–Thurs 8:30–17:30, Fri 8:30–16:30.

Full Range: Carmex Solid Carbide Thread Mills - NPT - For Internal & External Thread (MT)

View full collection →

You are viewing MT2020D398NPTMT7. Click any other SKU to view its full details.

Product SKUSizePitchFlute LengthReachOverall LengthPriceStock Order
MT0606C927NPTMT7 1/16 1/8279.99.958£86.80 In Stock
MT0808C1418NPTMT7 1/4 3/81814.814.864£115.62 In Stock
MT1212D2014NPTMT7 1/2 3/41420.920.984£166.90 In Stock
MT1616D2711.5NPTMT7 1 - 211.527.627.6105£196.90 5 days
MT2020D398NPTMT7 Viewing2 1/2 +839.739.7105£237.79 In Stock

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