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

Carmex Vertical Milling CMT Three Flute Insert - Threading - C258NPTMT7

SKU:C258NPTMT7

The Carmex Vertical Milling CMT Three Flute Insert - Threading (C258NPTMT7) is a versatile vertical milling insert designed to handle threading, grooves, chamfers and more. It’s built for enginee... Read more ↓
P
M
K
N
S
H
ApplicationThreading
Thread FormNPT
Internal or ExternalInternal & External
Insert Diameter25
Pitch8
Number of Flutes3
View all specifications ↓
Download Cutting Data
£36.84
Prices shown ex. VAT
In Stock— only 4 left
View Other Sizes →
Free delivery over £50 ex VAT
Secure checkout
14-day returns
30+ years expertise
Klarna
Pay in 3 interest-free instalments. No extra cost if paid on time. 18+ only.
Learn more about Klarna
Speak to our team
01732 887334
Mon – Thurs 8:30 – 17:30 · Fri 8:30 – 16:30

The Carmex Vertical Milling CMT Three Flute Insert - Threading (C258NPTMT7) is a versatile vertical milling insert designed to handle threading, grooves, chamfers and more. It’s built for engineers, machinists, and hobbyists who need reliable, repeatable results in demanding milling tasks with high surface quality. Ground-profile inserts deliver high precision and excellent performance, and a solid clamping method ensures full repeatability. The same insert can be used for right- or left-hand threads, and the toolholders include a Weldon shank and coolant bore. Chamfer inserts are also available.

  • Ground-profile inserts for precision and performance: Precise geometry delivers accurate threads, grooves, and chamfers with a smooth finish, even at higher cutting parameters.
  • One insert for both right- and left-hand threads: Simplifies procurement and setup, reducing inventory and speeding program changes.
  • Toolholders with Weldon shank and coolant bore: Secure, repeatable clamping paired with integrated coolant delivery for consistent results and easier tool changes.

Together, these features empower you to complete threading, grooves, and chamfers with confidence—improving consistency, reducing downtime, and helping you achieve reliable, quality results across a range of milling tasks.

Application Threading
Thread Form NPT
Internal or External Internal & External
Insert Diameter 25
Pitch 8
Number of Flutes 3
Holder Code H10 11 24 25

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.

★★★★★
Nice experience staff are very helpful and interested...
Staff are very helpful and interested in providing a good service making us the customer feel valued.
Bill
★★★★★
first place we look
honest about stock and prices are competitive.
Phil
★★★★★
Polite and helpful
Staff are very helpful and polite.Goods that were in stock were dispatched same day and back orders were quick in coming through .
Graham
★★★★★
Buying experience
Phone requests are handled quickly and without any fuss. The website is easy to use and straightforward to order from. It’s especially helpful that it shows real‑time availability, so we don’t need to call to confirm whether parts will arrive.
Jeremy

Full Range: Carmex Vertical Milling CMT Single Flute Inserts - NPT Partial Profile 60°

View full collection →

You are viewing C258NPTMT7. Click any other SKU to view its full details.

Product SKUInsert SizePitchPriceStock Order
C1018NPTMT7 1018£29.64 In Stock
C1814NPTMT7 15.814£34.96 5 days
C2511.5NPTMT7 2511.5£36.84 In Stock
C258NPTMT7 Viewing258£36.84 In Stock