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Carmex Threading Tap - Spiral Flute - UNC Supercut Tap - HSS-E - No. 4 x 40
| Style | Spiral Flute |
| Form | UNC |
| Size | No. 4 |
| Pitch | 40 |
| Tolerance | 2B |
| Standard | DIN 371 |
Learn more about Klarna
The Carmex UNC Supercut Spiral Flute Tap is built for professionals who need precise Unified National Coarse threads in tough materials. With HSS‑E construction and a spiral flute, it delivers durable, reliable threading in demanding applications.
- Thread Style: Spiral flute design for efficient chip evacuation and reduced clogging during UNC threading.
- Material: HSS‑E (high‑speed steel with cobalt) for enhanced wear resistance and heat tolerance in hard metals.
- Size / Length: No. 4 x 40 — compact UNC tap suited for a range of hole sizes and applications.
- Cutting Geometry: UNC Supercut geometry provides crisp thread formation and strong engagement for dependable performance.
- Applications: Optimized for tough materials such as steel, stainless steel, and cast iron, particularly at higher threading speeds.
With its robust construction and optimized geometry, this tap helps you achieve precise, durable UNC threads with fewer passes and less downtime. The spiral flute accelerates chip removal, minimizing heat buildup and extending tool life, while the cobalt‑enhanced HSS ensures longevity in demanding materials. Ideal for production runs, maintenance, and fabrication tasks where reliable, high‑quality threads are essential.
| Style | Spiral Flute |
| Form | UNC |
| Size | No. 4 |
| Pitch | 40 |
| Tolerance | 2B |
| Standard | DIN 371 |
| Reach | 18 |
| Thread Direction | Right Hand |
| Substrate | HSS-E |
| Materials | Universal |
| Shank Diameter | 3.5 |
| Overall Length | 56 |
| Flute Length | 5 |
| Square | 2.7 |
| Drill Diameter | 2.35 |
| Finish | XT5 |
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 Threading Taps - Spiral Flute - UNC Supercut Tap - HSS-E
View full collection →You are viewing CTSD371C440UNC2BXT5. Click any other SKU to view its full details.
| Product SKU | Size | Pitch | Overall Length | Flute Length | Square | Drill Diameter | Price | Stock | Order |
|---|---|---|---|---|---|---|---|---|---|
| CTSD371C256UNC2BXT5 | No. 2 | 56 | 45 | 10 | 2.1 | 1.85 | £25.46 | 5 days | |
| CTSD371C440UNC2BXT5 Viewing | No. 4 | 40 | 56 | 5 | 2.7 | 2.35 | £20.20 | In Stock | |
| CTSD371C540UNC2BXT5 | No. 5 | 40 | 56 | 7 | 2.7 | 2.65 | £20.20 | 5 days | |
| CTSD371C632UNC2BXT5 | No. 6 | 32 | 56 | 6 | 3 | 2.85 | £20.42 | 5 days | |
| CTSD371C1024UNC2BXT5 | No. 10 | 24 | 70 | 8 | 4.9 | 3.9 | £22.22 | 5 days | |
| CTSD371C1224UNC2BXT5 | No. 12 | 24 | 80 | 10 | 4.9 | 4.5 | £23.00 | 5 days | |
| CTSD371C025020UNC2BXT5 | 1/4 | 20 | 80 | 13 | 5.5 | 5.1 | £27.66 | 5 days | |
| CTSD371C031218UNC2BXT5 | 5/16 | 18 | 90 | 13 | 6 | 6.6 | £27.66 | 5 days | |
| CTSD371C037516UNC2BXT5 | 3/8 | 16 | 100 | 15 | 8 | 8 | £36.32 | 5 days | |
| CTSD376C043714UNC2BXT5 | 7/16 | 14 | 100 | 15 | 6.2 | 9.4 | £47.22 | 5 days | |
| CTSD376C050013UNC2BXT5 | 1/2 | 13 | 110 | 18 | 7 | 10.8 | £63.58 | 5 days | |
| CTSD376C056212UNC2BXT5 | 9/16 | 12 | 110 | 20 | 9 | 12.2 | £63.58 | 5 days | |
| CTSD376C062511UNC2BXT5 | 5/8 | 11 | 110 | 22 | 9 | 13.5 | £74.48 | 5 days | |
| CTSD376C075010UNC2BXT5 | 3/4 | 10 | 125 | 25 | 11 | 16.5 | £110.52 | 5 days | |
| CTSD376C08759UNC2BXT5 | 7/8 | 9 | 140 | 30 | 14.5 | 19.5 | £149.38 | 5 days | |
| CTSD376C1-8UNC2BXT5 | 1 | 8 | 160 | 30 | 16 | 22.25 | £194.02 | 5 days |
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