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Carmex Threading Tap - Spiral Flute - UNC Supercut Tap - HSS-E - 5/16 x 18
| Style | Spiral Flute |
| Form | UNC |
| Size | 5/16 |
| Pitch | 18 |
| Tolerance | 2B |
| Standard | DIN 371 |
Learn more about Klarna
The Carmex Threading Tap, Spiral Flute, UNC Supercut Tap in 5/16 x 18 UNC is built for professionals who need fast, accurate threading in tough materials. This high-performance tool combines a cobalt-enriched HSS-E body with a spiral flute to deliver reliable UNC threading in demanding applications.
- Size and Thread: 5/16" diameter, 18 threads per inch (UNC) for robust, coarse-threaded fasteners
- Flute Design: Spiral flutes optimize chip evacuation and reduce clogging during deep or through holes
- Material: HSS-E (high-speed steel with cobalt) for enhanced heat resistance and wear life
- Cut Style: UNC Supercut geometry designed for clean starts, consistent thread quality, and longer edge life
- Drive/Compatibility: Hex drive shank for secure engagement with standard tapping tools
With this tap, you gain faster, more reliable threads in challenging metals, less downtime from chip packing, and longer tool life thanks to robust cobalt-enhanced steel. The spiral flute maintains steady cutting action, minimizes burrs, and produces consistent, to-spec threads. It's ideal for job sites and workshops—from automotive repair and equipment maintenance to precision fabrication in metalworking shops—where dependable UNC threads matter.
| Style | Spiral Flute |
| Form | UNC |
| Size | 5/16 |
| Pitch | 18 |
| Tolerance | 2B |
| Standard | DIN 371 |
| Reach | 35 |
| Thread Direction | Right Hand |
| Substrate | HSS-E |
| Materials | Universal |
| Shank Diameter | 8 |
| Overall Length | 90 |
| Flute Length | 13 |
| Square | 6 |
| Drill Diameter | 6.6 |
| 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 CTSD371C031218UNC2BXT5. 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 | 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 Viewing | 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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