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

Carmex Thread Turning External Insert - American Butress - Left Hand - 11EL20ABUTBMA

Carmex Thread Turning External Insert - American Butress - Left Hand - 11EL20ABUTBMA

SKU:11EL20ABUTBMA

Carmex Thread Turning External Insert – American Butress – Left Hand – 11EL20ABUTBMA is a precision carbide insert for external thread turning. Part of Carmex's industry-leading range, this laydo... Read more ↓
P
M
K
S
H
Thread TypeExternal
Thread DirectionLeft Hand
Thread FormAmerican Butress
Pitch20
View all specifications ↓
Download Cutting Data
£10.28
Prices shown ex. VAT
5 days estimated lead time — subject to availability
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

Description

Carmex Thread Turning External Insert – American Butress – Left Hand – 11EL20ABUTBMA is a precision carbide insert for external thread turning. Part of Carmex's industry-leading range, this laydown triangular insert is designed to cover the majority of thread standards in use today, delivering clean, accurate thread forms across a wide range of applications.

Ideal for engineers, machinists, and technicians who value dependable performance, this left-hand insert supports both basic and demanding threading tasks with consistent results. The compact geometry helps reduce setup time and minimizes tool changes while maintaining stable cutting action.

  • Broad thread-standards compatibility: Covers the majority of external thread standards, enabling quick setup and reducing the need for multiple tools.
  • Durable carbide with precise geometry: Delivers long tool life and reliable thread formation, even in challenging materials, with consistent finishes.
  • Left-hand threading optimized: Specifically designed for left-hand external threads, delivering controlled cutting action and easier setup in dedicated runs.

Using this insert helps streamline threading workflows, reduces downtime, and ensures repeatable, high-quality thread forms across parts. Its broad compatibility, durable construction, and left-hand readiness give you confidence to tackle a wide range of threading tasks with predictable results.

Part Numbers

Protool Part Number
11EL20ABUTBMA
Brand
Carmex
Category
Thread Turning
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.

Complete Your Project

Tooling and consumables that work with this product.
All 6 →