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OSG Threading Tap - UNC Spiral Flute HSS-E - Steam Oxide Coated - Blind Hole - 1/4 x 20
| Form | UNC |
| Size | 1/4 |
| Pitch | 20 |
| Flute Length | 19 |
| Shank Diameter | 6.3 |
| Overall Length | 66 |
Learn more about Klarna
The OSG UNC Spiral Flute Threading Tap is a precision tool designed for blind-hole threading, built for machinists who demand accuracy, durability, and reliable performance in metalworking projects.
- Size & Thread: 1/4" x 20 UNC threaded tap for standard coarse-threads in blind holes
- Material: HSS-E (high-speed steel with cobalt) for enhanced wear resistance and heat tolerance
- Coating: Steam oxide coating to reduce friction and extend tool life
- Flute Design: Spiral flute geometry facilitates efficient chip evacuation, minimizing binding in blind holes
- Application: Optimized for precise threading in blind-hole scenarios where clear chip removal is essential
- Brand & Technology: Utilizes OSG’s advanced threading technology to deliver consistent, high-quality threads
This tap combines cobalt-enhanced HSS-E performance with a durable steam-oxide finish to deliver consistent thread accuracy and longer tool life, even in tougher materials. The spiral flute design helps remove chips quickly, reducing the risk of tap breakage in deep, confined holes. Ideal for shops and projects where reliable, repeatable blind-hole threads are essential, this tap supports precise fastener fit and strong joint integrity across a range of common metalworking applications.
| Form | UNC |
| Size | 1/4 |
| Pitch | 20 |
| Flute Length | 19 |
| Shank Diameter | 6.3 |
| Overall Length | 66 |
| Substrate | HSS-E |
| Style | Spiral Flute |
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: OSG Threading Taps - UNC Spiral Flute HSS-E - Steam Oxide Coated - Blind Hole
View full collection →You are viewing OSG-23204714. Click any other SKU to view its full details.
| Product SKU | Size | Pitch | Flute Length | Shank Diameter | Overall Length | Price | Stock | Order |
|---|---|---|---|---|---|---|---|---|
| OSG-23204574 | No. 4 | 40 | 11 | 3.15 | 48 | £79.95 | 1-2 days | |
| OSG-23204594 | No. 5 | 40 | 11 | 3.15 | 48 | £79.95 | 1-2 days | |
| OSG-23204614 | No. 6 | 32 | 13 | 3.55 | 50 | £48.33 | In Stock | |
| OSG-23204644 | No. 8 | 32 | 13 | 4.5 | 53 | £48.33 | In Stock | |
| OSG-23204664 | No. 10 | 24 | 16 | 5 | 58 | £48.33 | 1-2 days | |
| OSG-23204714 Viewing | 1/4 | 20 | 19 | 6.3 | 66 | £39.97 | In Stock | |
| OSG-23204744 | 5/16 | 18 | 22 | 8 | 72 | £46.41 | 1-2 days | |
| OSG-23204794 | 3/8 | 16 | 24 | 10 | 80 | £59.10 | In Stock | |
| OSG-23204894 | 1/2 | 13 | 29 | 9 | 89 | £83.26 | In Stock |
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