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Carmex Thread Mills Solid Carbide - With Through Coolant - Whitworth BSW BSF - 3/8 x 20 - MT7
| Thread Form | Whitworth BSW BSF |
| Size | 3/8 |
| Pitch | 20 |
| Diameter (D) | 7.6 |
| Flute Length (l) | 19.7 |
| Shank Diameter (d) | 8 |
Learn more about Klarna
Introducing the Carmex MTB solid carbide thread mill with through-coolant — a precision threading tool built for Whitworth BSW and BSF threads (3/8 in. diameter, 20 TPI). Designed for machinists who need reliable chip control, durable form, and consistent thread quality in challenging materials and hole depths.
- Through-Coolant Bore: Coolant is fed through the bore to carry away chips and keep cutting temperatures in check, promoting cleaner threads and extending tool life.
- Solid Carbide Construction: Rigid, wear-resistant carbide ensures stable, repeatable thread milling performance even in tough materials.
- Whitworth BSW/BSF Thread Forms: Precise 3/8" diameter with 20 TPI designed to match standard Whitworth threads for reliable engagement.
- MT7 Shank: Rugged MT7 shank provides strong tool retention and compatibility with a wide range of CNC milling centers and tool changers.
- Optimized Thread Milling Geometry: Specifically ground flute and cutting-edge geometry deliver clean thread profiles and reduced burr formation.
This tool helps you achieve accurate Whitworth threads in deeper or harder-to-reach holes without sacrificing surface finish or tool life. The through-coolant design minimizes chip buildup, lowers cutting forces, and sustains productive cycle times—making it well-suited for maintenance, repair, and production environments where vintage standards meet modern machining demands. For reliable, consistent results in Whitworth threading tasks, the Carmex MTB solid carbide thread mill is a dependable choice.
| Thread Form | Whitworth BSW BSF |
| Size | 3/8 |
| Pitch | 20 |
| Diameter (D) | 7.6 |
| Flute Length (l) | 19.7 |
| Shank Diameter (d) | 8 |
| No of Flutes | 4 |
| Overall Length (L) | 64 |
| Thread Mill Style | Standard + Coolant |
| Internal or External | Internal & External |
| Coating | MT7 |
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 Solid Carbide Thread Mills - Whitworth - With Through Coolant (MTB)
View full collection →You are viewing MTB08076D1920WMT7. Click any other SKU to view its full details.
| Product SKU | Size | Pitch | Flute Length | Reach | Shank Diameter | Overall Length | Price | Stock | Order |
|---|---|---|---|---|---|---|---|---|---|
| MTB06046C1320WMT7 | 1/4 | 20 | 13.3 | 13.3 | 6 | 58 | £95.48 | 5 days | |
| MTB06056C1618WMT7 | 5/16 | 18 | 16.2 | 16.2 | 6 | 58 | £95.48 | 5 days | |
| MTB08076D1920WMT7 Viewing | 3/8 | 20 | 19.7 | 19.7 | 8 | 64 | £127.18 | 5 days | |
| MTB0807D1916WMT7 | 3/8 | 16 | 19.8 | 19.8 | 8 | 64 | £127.18 | 5 days | |
| MTB0808D2214WMT7 | 7/16 | 14 | 22.7 | 22.7 | 8 | 64 | £127.18 | 5 days | |
| MTB10088D2318WMT7 | 7/16 | 18 | 23.3 | 23.3 | 10 | 73 | £146.70 | 5 days | |
| MTB1009D2612WMT7 | 1/2 - 9/16 3/4 - 13/16 | 12 | 26.5 | 26.5 | 10 | 73 | £146.70 | 5 days | |
| MTB1010E2616WMT7 | 1/2 - 9/16 | 16 | 26.1 | 26.1 | 10 | 73 | £146.70 | 5 days | |
| MTB12118E3311WMT7 | 5/8 7/8 | 11 | 33.5 | 33.5 | 12 | 84 | £183.59 | 5 days | |
| MTB14128E3114WMT7 | 5/8 - 11/16 | 14 | 31.8 | 31.8 | 14 | 83 | £204.20 | 5 days | |
| MTB1616E439WMT7 | Standard + Coolant | Whitworth BSW BSF | 7/8 1 1/8 | 9 | 43.7 | 43.7 | £259.88 | 5 days |
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