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Carmex Threading Tap - Spiral Flute - UNF Supercut Tap - HSS-E - 1/12 x 20
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Description
The Carmex Spiral Flute UNF Supercut Tap, crafted in HSS-E, is a precision threading tool built for Unified National Fine (UNF) applications. Designed for machinists, toolmakers, and metal fabricators who demand reliable, clean threads in challenging materials, it delivers consistent results from start to finish.
- Thread Type: UNF (Unified National Fine) threading for tight, accurate internal threads in a variety of metals.
- Size: 1/12 x 20 (1/12" nominal diameter with a 20 TPI UNF pitch).
- Flute Design: Spiral flute facilitates efficient chip evacuation, reducing clogging and maintaining smooth cutting action.
- Material: HSS-E (high-speed steel with cobalt content) for enhanced hardness, temperature resistance, and tool life.
- Cutting Action: Supercut geometry delivers crisp teeth and steady cutting through tougher materials with improved finish.
- Durability: Optimized for high-speed threading and demanding materials, helping extend tap life and reduce rework.
- Applications: Ideal for internal UNF threads in steel, stainless steel, and other alloys where precision and reliability matter.
With this tap, you’ll achieve precise UNF threads with fewer passes and less risk of tap binding. The spiral flute design aggressively clears chips, supporting higher speeds and cleaner cuts, while the cobalt-infused HSS-E construction resists heat and wear. This combination translates to accurate thread profiles, smoother tapping experiences, and reduced downtime in both prototype work and production tasks. Perfect for maintenance, repair jobs, or new builds that require dependable UNF threading performance.
Part Numbers
- Protool Part Number
- CTSD374C050020UNF2BXT5
- Brand
- Carmex
- Category
- Threading Tap
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 Threading Taps - Spiral Flute - UNF Supercut Tap - HSS-E
View full collection →You are viewing CTSD374C050020UNF2BXT5. Click any other SKU to view its full details.
| Product SKU | Size | Pitch | Overall Length | Flute Length | Square | Drill Diameter | Price | Stock | Order |
|---|---|---|---|---|---|---|---|---|---|
| CTSD371C640UNF2BXT5 | No. 6 | 40 | 56 | 6 | 3 | 2.95 | £20.42 | 5 days | |
| CTSD371C836UNF2BXT5 | No. 8 | 36 | 63 | 7 | 3.4 | 3.5 | £22.22 | 5 days | |
| CTSD371C1032UNF2BXT5 | No. 10 | 32 | 70 | 8 | 4.9 | 4.1 | £22.22 | 5 days | |
| CTSD371C1228UNF2BXT5 | No. 12 | 28 | 80 | 10 | 4.9 | 4.6 | £23.00 | 5 days | |
| CTSD371C025028UNF2BXT5 | 1/4 | 28 | 80 | 10 | 5.5 | 5.5 | £27.66 | 5 days | |
| CTSD371C031224UNF2BXT5 | 5/16 | 24 | 90 | 13 | 6 | 6.9 | £27.66 | 5 days | |
| CTSD371C037524UNF2BXT5 | 3/8 | 24 | 100 | 15 | 8 | 8.5 | £36.32 | 5 days | |
| CTSD374C043720UNF2BXT5 | 7/16 | 20 | 100 | 15 | 6.2 | 9.9 | £47.22 | 5 days | |
| CTSD374C050020UNF2BXT5 Viewing | 1/12 | 20 | 100 | 15 | 7 | 11.5 | £63.58 | 5 days | |
| CTSD374C056218UNF2BXT5 | 9/16 | 18 | 100 | 15 | 9 | 12.9 | £74.48 | 5 days | |
| CTSD374C062518UNF2BXT5 | 5/8 | 18 | 100 | 15 | 9 | 14.5 | £74.48 | 5 days | |
| CTSD374C075016UNF2BXT5 | 3/4 | 16 | 110 | 17 | 11 | 17.5 | £110.52 | 5 days | |
| CTSD374C087514UNF2BXT5 | 7/8 | 14 | 125 | 17 | 14.5 | 20.4 | £151.84 | 5 days |
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