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OSG Threading Tap - NPT Spiral Point HSS-E - Steam Oxide Coated - Through Hole - 1/4 x 18
| Form | NPT |
| Size | 1/4 |
| Pitch | 18 |
| Flute Length | 1.1/16 |
| Shank Diameter | 0.429 |
| Overall Length | 2.7/16 |
Learn more about Klarna
Achieve fast, precise National Pipe Taper (NPT) threads in through-hole work with the OSG NPT Spiral Point Threading Tap. Crafted from cobalt-enhanced HSS-E and finished with a Steam Oxide coating, it’s built for durability and consistent performance in demanding machining environments.
- Thread type: NPT spiral point threading tap designed for through-hole applications
- Size: 1/4" diameter, 18 TPI (1/4 x 18)
- Material: HSS‑E (high-speed steel with cobalt) for enhanced hardness and heat resistance
- Coating: Steam Oxide coating to improve wear resistance and lubrication
- Geometry: Spiral flute with a spiral point to promote immediate chip evacuation
- Application: Ideal for through-hole NPT tapping in production and repair work
The spiral point design ensures chips are pushed ahead of the tap, reducing recutting and improving cycle times on through holes. The HSS‑E core maintains sharpness under elevated cutting temperatures, while the Steam Oxide coating adds a protective layer to extend tool life and resist corrosion. This combination delivers clean, accurate threads that seal reliably in piping connections, supporting repeatable results across multiple parts and setups.
| Form | NPT |
| Size | 1/4 |
| Pitch | 18 |
| Flute Length | 1.1/16 |
| Shank Diameter | 0.429 |
| Overall Length | 2.7/16 |
| Substrate | HSS-E |
| Style | Spiral Point |
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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 - NPT Spiral Point HSS-E - Steam Oxide Coated - Through Hole
View full collection →You are viewing OSG-22628774. Click any other SKU to view its full details.
| Product SKU | Size | Pitch | Flute Length | Shank Diameter | Overall Length | Price | Stock | Order |
|---|---|---|---|---|---|---|---|---|
| OSG-22628764 | 1/8 | 27 | 0.75 | 0.318 | 2.1/8 | £69.52 | In Stock | |
| OSG-22628774 Viewing | 1/4 | 18 | 1.1/16 | 0.429 | 2.7/16 | £95.62 | In Stock | |
| OSG-22628784 | 3/8 | 18 | 1.1/16 | 5.542 | 3.3/16 | £112.98 | In Stock | |
| OSG-22628794 | 1/2 | 14 | 1.3/8 | 0.687 | 3.1/8 | £139.05 | In Stock | |
| OSG-22628804 | 3/4 | 14 | 1.3/8 | 0.906 | 3.1/4 | £201.63 | 1-2 days | |
| OSG-22628814 | 1 | 11.5 | 1.3/4 | 1.125 | 3.3/4 | £272.89 | 1-2 days |
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