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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
Carmex delivers a compact, high-precision solid carbide thread milling cutter designed for through-coolant threading in pre-drilled holes. The MTSB Mini Type is tailored for No. 4-40 threads and MT7 shanks, offering reliable performance in tight, demanding machining scenarios.
- Tool Type: Miniature solid carbide thread milling cutter (MTSB family) with internal cooling bore for through-coolant operation.
- Material: Solid carbide for excellent wear resistance, stiffness, and long tool life in metalworking.
- Coolant System: Internal bore delivers high-pressure coolant through the tool into the pre-hole, actively washing away chips during the threading circle.
- Through-Coolant Capability: Coolant reaches the cutting edge, enhancing heat dissipation and maintaining dimensional stability.
- Thread Compatibility: Suitable for UN family threads, including UNC, UNF, UNEF, and UNS profiles.
- Thread Size: No. 4-40 threading capability for small-diameter, precision applications.
- Interface: MT7 shank compatible with a wide range of CNC mills and toolholders.
- Application: Ideal for creating clean, accurate internal threads in pre-drilled holes with efficient chip evacuation.
This through-coolant design reduces heat buildup at the cutting edge, improves surface finish, and supports higher feed rates by maintaining consistent chip clearance. It’s a practical choice for shops and manufacturers seeking repeatable No. 4-40 threads in tight tolerances, with the reliability of Carmex’s solid carbide performance and the convenience of through-coolant delivery.
Part Numbers
- Protool Part Number
- MTSB06021D640UNMT7
- 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 MTSB06021D640UNMT7. 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 | No. 4 | 40 | 1.91 | 12 | 58 | £117.11 | 5 days | |
| MTSB06021D640UNMT7 Viewing | 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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