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Carmex Thread Mills Mini Type - Through Coolant - UN (UNC UNF UNEF UNS) - No. 4 x 40 - MT7
| Thread Form | UN (UNC UNF UNEF UNS) |
| Size | No. 4 |
| Pitch | 40 |
| Diameter (D) | 2.1 |
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Description
Precision, durability, and clean threading in a compact form—the Carmex Thread Mills Mini Type with Through Coolant is built for internal thread milling in pre-drilled holes, especially when UNC, UNF, UNEF, and UNS threads are required. Designed for CNC environments, this solid carbide cutter delivers reliable performance where space and tight tolerances matter.
- Tool Family: MTSB mini thread mill with an internal through-coolant bore, engineered to push coolant directly to the cutting edge for peak performance.
- Size & Shank: No. 4 x 40 with MT7 shank, suitable for small-diameter threading in confined spaces.
- Material: Solid carbide construction for exceptional hardness, heat resistance, and long tool life.
- Coolant System: Internal coolant bore enables high-pressure through-coolant delivery to an application pre-hole, improving chip evacuation during the threading circle.
- Threading Capability: Optimized for internal threads in UNC, UNF, UNEF, and UNS standards, giving precise engagement and finish.
- Chip Control: Efficient coolant flow and chip washout reduce chip buildup and stabilize cutting conditions.
The through-coolant design directly targets heat at the cutting edge, allowing higher feed rates and more stable threading in small-diameter holes. That means cleaner, more consistent threads, reduced cycle times, and less tool wear in demanding manufacturing environments. Ideal for aerospace, automotive, and precision engineering applications where reliable internal threading and a smooth surface finish are essential.
Part Numbers
- Protool Part Number
- MTSB06021D1240UNMT7
- 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.
Full Range: Carmex Carbide Thread Mills - UN Mini Type With Internal Coolant Bore (MTSB)
View full collection →You are viewing MTSB06021D1240UNMT7. Click any other SKU to view its full details.
| Product SKU | Size | Pitch | Flute Length | Reach | Overall Length | Price | Stock | Order |
|---|---|---|---|---|---|---|---|---|
| MTSB06012C480UNMT7 | No. 4 | 80 | 0.95 | 4.9 | 58 | £117.11 | 5 days | |
| MTSB06014C572UNMT7 | No. 1 | 72 | 1.06 | 5.9 | 58 | £117.11 | 5 days | |
| MTSB06016C456UNMT7 | No. 2 No. 3 | 56 | 1.36 | 4.8 | 58 | £117.11 | 5 days | |
| MTSB06016C756UNMT7 | No. 2 No. 3 | 56 | 1.36 | 7 | 58 | £117.11 | 5 days | |
| MTSB06019D548UNMT7 | No. 3 No. 4 | 48 | 1.59 | 5.6 | 58 | £117.11 | 5 days | |
| MTSB06021D1240UNMT7 Viewing | No. 4 | 40 | 1.91 | 12 | 58 | £117.11 | 5 days | |
| MTSB06021D640UNMT7 | No. 4 | 40 | 1.91 | 6.3 | 58 | £117.11 | 5 days | |
| MTSB06021D940UNMT7 | No. 4 | 40 | 1.91 | 9.2 | 58 | £117.11 | In Stock | |
| MTSB06024D740UNMT7 | No. 5 No. 6 | 40 | 1.91 | 7 | 58 | £117.11 | 5 days | |
| MTSB06025D1132UNMT7 | No. 6 | 32 | 2.38 | 11.3 | 58 | £117.11 | 5 days | |
| MTSB06025D732UNMT7 | No. 6 | 32 | 2.38 | 7.8 | 58 | £117.11 | 5 days | |
| MTSB06032D1332UNMT7 | No. 8 | 32 | 2.38 | 13.3 | 58 | £117.11 | 5 days | |
| MTSB06032D932UNMT7 | No. 8 | 32 | 2.38 | 9.1 | 58 | £117.11 | 5 days | |
| MTSB06035D1024UNMT7 | No. 10 No. 12 | 24 | 3.18 | 10.7 | 58 | £117.11 | 5 days | |
| MTSB06035D1524UNMT7 | No. 10 No. 12 | 24 | 3.18 | 15.5 | 58 | £117.11 | 5 days | |
| MTSB06037D1032UNMT7 | No. 10 | 32 | 2.38 | 10.5 | 58 | £117.11 | 5 days | |
| MTSB06037D1532UNMT7 | No. 10 | 32 | 2.38 | 15.3 | 58 | £117.11 | 5 days | |
| MTSB06052D2028UNMT7 | 1/4 | 28 | 2.72 | 20 | 58 | £117.11 | 5 days | |
| MTSB08066D2424UNMT7 | 5/16 3/8 | 24 | 3.18 | 24.9 | 64 | £156.17 | 5 days | |
| MTSB10092E3420UNMT7 | 7/16 1/2 | 20 | 3.81 | 34.6 | 73 | £202.07 | 5 days |
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