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OSG Threading Tap - UNF Spiral Flute HSS-E - Steam Oxide Coated - Blind Hole - 1/2 x 20
| Form | UNF |
| Size | 1/2 |
| Pitch | 20 |
| Flute Length | 29 |
| Shank Diameter | 9 |
| Overall Length | 89 |
Learn more about Klarna
The OSG UNF Spiral Flute Threading Tap is a high-precision tool designed for blind-hole threading, delivering clean, accurate threads with durable, long-lasting performance. Built for professionals who demand reliability in tough materials, it combines advanced metallurgy with a practical spiral flute design.
- Size: 1/2 x 20 UNF
- Material: HSS‑E (high-speed steel with cobalt) for enhanced hardness and wear resistance
- Coating: Steam oxide coating for improved durability and heat resistance
- Flute design: Spiral flute geometry optimized for efficient chip evacuation in blind-hole tapping
- Thread type: UNF threading for precise engagement in fine-thread applications
- Application: Ideal for blind-hole tapping in demanding materials and critical machining tasks
- Brand: OSG
Designed to deliver high-quality, repeatable threads, this tap pairs the toughness of HSS‑E cobalt with a steam oxide finish to extend tool life in demanding environments. The spiral flute design minimizes chip buildup and binding, enabling smoother cutting and faster cycle times in blind holes. Whether you’re building precision components, automotive parts, or aerospace-grade assemblies, this tap helps you achieve accurate threads, reduced downtime, and consistent performance across production runs.
| Form | UNF |
| Size | 1/2 |
| Pitch | 20 |
| Flute Length | 29 |
| Shank Diameter | 9 |
| Overall Length | 89 |
| 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 - UNF Spiral Flute HSS-E - Steam Oxide Coated - Blind Hole
View full collection →You are viewing OSG-22204914. Click any other SKU to view its full details.
| Product SKU | Size | Pitch | Flute Length | Shank Diameter | Overall Length | Price | Stock | Order |
|---|---|---|---|---|---|---|---|---|
| OSG-22204544 | No. 2 | 64 | 9.8 | 2.8 | 44.5 | £61.26 | In Stock | |
| OSG-22204564 | No. 3 | 56 | 9.5 | 2.8 | 44.5 | £61.26 | 1-2 days | |
| OSG-22204584 | No. 4 | 48 | 11 | 3.15 | 48 | £39.97 | In Stock | |
| OSG-22204604 | No. 5 | 44 | 11 | 3.15 | 48 | £39.97 | In Stock | |
| OSG-22204624 | No. 6 | 40 | 13 | 3.55 | 50 | £24.13 | In Stock | |
| OSG-22204654 | No. 8 | 36 | 13 | 4.5 | 53 | £24.13 | In Stock | |
| OSG-22204674 | No. 10 | 32 | 16 | 5 | 58 | £24.13 | In Stock | |
| OSG-22204694 | No. 12 | 28 | 17 | 5.6 | 62 | £29.55 | In Stock | |
| OSG-22204724 | 1/4 | 28 | 19 | 6.3 | 66 | £20.00 | In Stock | |
| OSG-22204764 | 5/16 | 24 | 22 | 8 | 72 | £23.19 | In Stock | |
| OSG-22204814 | 3/8 | 24 | 24 | 10 | 80 | £29.55 | In Stock | |
| OSG-22204864 | 7/16 | 20 | 25 | 8 | 85 | £41.11 | In Stock | |
| OSG-22204914 Viewing | 1/2 | 20 | 29 | 9 | 89 | £41.63 | In Stock | |
| OSG-22204964 | 9/16 | 18 | 30 | 11.2 | 95 | £53.03 | In Stock | |
| OSG-22205044 | 5/8 | 18 | 32 | 12.5 | 102 | £61.69 | In Stock | |
| OSG-22205174 | 3/4 | 16 | 37 | 14 | 112 | £92.73 | In Stock | |
| OSG-22205284 | 7/8 | 14 | 38 | 16 | 118 | £128.64 | In Stock | |
| OSG-22205394 | 1 | 12 | 45 | 18 | 130 | £154.71 | In Stock | |
| OSG-22205534 | 1.1/8 | 12 | 48 | 20 | 138 | £265.95 | In Stock | |
| OSG-22205664 | 1.1/4 | 12 | 51 | 22.4 | 151 | £338.98 | 1-2 days |
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