Please log in here to access all benefits, including promotional discounts and faster checkouts.
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
Precision threading for demanding blind-hole work. The OSG UNF Spiral Flute Threading Tap delivers accurate, reliable threads with extended tool life, built for professionals who demand consistency in every critical machining task.
- Size/Thread: 1/2" diameter, 20 TPI UNF (1/2-20 UNF) for fine, strong threads in high-precision assemblies.
- Material: HSS-E cobalt alloy for increased hardness and heat resistance during tough tapping applications.
- Coating: Steam oxide coating enhances lubrication and corrosion resistance, reducing galling and wear.
- Flute Design: Spiral flute geometry promotes efficient chip evacuation in blind holes, minimizing clogging and tool breakage.
- Application: Specifically optimized for blind-hole tapping in metal parts, delivering clean, reproducible threads.
- Brand/Engineering: OSG threading technology calibrated for precision, reliability, and long tool life in professional shops.
This tap is designed to cut precise UNF threads in a variety of metals while maintaining control and consistency through every revolution. The combination of HSS-E cobalt, steam oxide coating, and spiral flutes means you can tackle deeper blind-hole taps with less fuss, fewer reworks, and longer intervals between tool changes. Ideal for production environments, job shops, and repair work where dependable, accurate threads matter most.
| 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-T9547058. Click any other SKU to view its full details.
| Product SKU | Size | Pitch | Flute Length | Shank Diameter | Overall Length | Price | Stock | Order |
|---|---|---|---|---|---|---|---|---|
| OSG-23204674 | No. 10 | 32 | 16 | 5 | 58 | £48.33 | In Stock | |
| OSG-23204724 | 1/4 | 28 | 19 | 6.3 | 66 | £39.97 | In Stock | |
| OSG-23204764 | 5/16 | 24 | 22 | 8 | 72 | £46.41 | In Stock | |
| OSG-23204814 | 3/8 | 24 | 24 | 10 | 80 | £59.10 | In Stock | |
| OSG-23204814A | 7/16 | 20 | 25 | 8 | 85 | £82.22 | 1-2 days | |
| OSG-T9547058 Viewing | 1/2 | 20 | 29 | 9 | 89 | £83.26 | 1-2 days |
No products match your filters.
