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Carmex Carbide Threading Insert - PG - TiAlN Coated - 21-18PG

SKU:21-18PG

The Carmex Carbide Threading Insert - PG - TiAlN Coated - 21-18PG is a versatile carbide insert designed to handle a wide range of common thread profiles. Built for professional shops, it deliver... Read more ↓
P
M
K
N
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ApplicationThreading
Thread FormPG
Internal or ExternalInternal & External
Insert Size21
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£48.74
Prices shown ex. VAT
5 days estimated lead time — subject to availability
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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

Description

The Carmex Carbide Threading Insert - PG - TiAlN Coated - 21-18PG is a versatile carbide insert designed to handle a wide range of common thread profiles. Built for professional shops, it delivers reliable, repeatable threading performance with fewer tool changes.

  • TiAlN coating: TiAlN coating boosts wear resistance and heat tolerance, helping edges stay sharper longer during high-speed threading.
  • Double-edged design: The inserts are typically double-sided, offering two cutting edges for extended life; note that BSPT, NPT, NPTF, American Buttress, and API RD profiles may use a single edge.
  • Five length options: Available in five lengths from 12 mm to 40 mm, providing the reach needed for different threading tasks.
  • Broad pitch range: Depending on length, supports pitches from 0.5 mm (32 TPI) to 6.0 mm (4 TPI), covering most common thread forms.
  • Internal & external threading compatibility: For many thread profiles, the same insert can machine both internal and external threads, with exceptions for ISO, UN, NPSM, UNJ, and Acme profiles.

This insert delivers practical value for both manual lathes and CNC setups, enabling consistent thread quality across a variety of materials. Its robust carbide substrate and TiAlN coating help sustain performance in demanding threading applications, reducing downtime and tool costs while helping you meet tight tolerances with confidence.

Part Numbers

Protool Part Number
21-18PG
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 Carbide Threading Inserts - PG - TiAlN Coated

View full collection →

You are viewing 21-18PG. Click any other SKU to view its full details.

Product SKUInsert SizePitchPriceStock Order
14-18PG 1418£36.70 In Stock
21-16PG 2116£48.74 In Stock
21-18PG Viewing2118£48.74 5 days
30-16PG 3016£66.87 5 days

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