Please log in here to access all benefits, including promotional discounts and faster checkouts.
OSG Threading Tap - NPT Spiral Flute HSS-E - Steam Oxide Coated - Blind Hole - 3/8 x 18
Learn more about Klarna
Description
The OSG NPT Spiral Flute Threading Tap is a precision tool built for professionals who need reliable 3/8-18 NPT threads in blind holes. Crafted from HSS-E cobalt and finished with Steam Oxide, it delivers durable, heat-resistant performance for demanding tapping tasks.
- Thread Size and Type: 3/8-18 NPT pipe thread designed for standard NPT connections in blind-hole applications.
- Flute Design: Spiral flute facilitates efficient chip evacuation, helping prevent chip packing in blind holes.
- Material and Coating: HSS-E cobalt steel with a Steam Oxide coating for enhanced wear resistance and lubricity.
- Application: Ideal for tapping NPT threads in blind holes on metal components used in hydraulics, pneumatics, and piping systems.
- Chip Evacuation: Open spiral path directs chips upward and out as threads form, reducing the risk of debris packing the hole.
- Surface Treatment: Steam Oxide finish boosts lubricity and contributes to longer tool life in demanding tapping tasks.
With the OSG NPT Spiral Flute Threading Tap, you can expect precise, clean threads that seal reliably in NPT connections. The HSS-E cobalt base and steam-oxide coating deliver durability and smoother cutting, translating to longer tool life and fewer re-taps in tough metals. The spiral flute’s efficient chip evacuation minimizes slot packing, reducing downtime and ensuring consistent performance across blind-hole threads. This tap is ideally suited for automotive, hydraulic, and industrial piping projects where dependable, leak-tight fittings matter most.
Part Numbers
- Protool Part Number
- OSG-22638784
- Brand
- OSG
- 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: OSG Threading Taps - BSP Spiral Flute HSS-E - Steam Oxide Coated - Blind Hole
View full collection →You are viewing OSG-22638784. Click any other SKU to view its full details.
| Product SKU | Size | Pitch | Flute Length | Shank Diameter | Overall Length | Price | Stock | Order |
|---|---|---|---|---|---|---|---|---|
| OSG-22418004 | 1/8 | 28 | 15 | 8 | 59 | £29.55 | In Stock | |
| OSG-22418014 | 1/4 | 19 | 19 | 10 | 67 | £44.30 | In Stock | |
| OSG-22418024 | 3/8 | 19 | 21 | 12.5 | 75 | £61.69 | In Stock | |
| OSG-22418034 | 1/2 | 14 | 26 | 16 | 87 | £93.00 | In Stock | |
| OSG-22418044 | 5/8 | 14 | 26 | 18 | 91 | £116.01 | In Stock | |
| OSG-22418054 | 3/4 | 14 | 28 | 20 | 96 | £121.67 | In Stock | |
| OSG-22418074 | 1 | 11 | 33 | 25 | 109 | £217.29 | In Stock | |
| OSG-22618384 | 1/8 | 28 | 15 | 8 | 59 | £84.29 | In Stock | |
| OSG-22618394 | 1/4 | 19 | 19 | 10 | 67 | £107.76 | In Stock | |
| OSG-22618404 | 3/8 | 19 | 21 | 12.5 | 75 | £130.36 | In Stock | |
| OSG-22618414 | 1/2 | 14 | 26 | 16 | 87 | £159.91 | In Stock | |
| OSG-22618434 | 3/4 | 14 | 28 | 20 | 96 | £238.15 | 1-2 days | |
| OSG-22618454 | 1 | 11 | 33 | 25 | 109 | £319.85 | 1-2 days | |
| OSG-22638764 | 1/8 | 27 | 0.75 | 0.318 | 2.1/8 | £84.29 | In Stock | |
| OSG-22638774 | 1/4 | 18 | 1.1/16 | 0.429 | 2.7/16 | £107.76 | In Stock | |
| OSG-22638784 Viewing | 3/8 | 18 | 1.1/16 | 5.542 | 3.3/16 | £130.36 | In Stock | |
| OSG-22638794 | 1/2 | 14 | 1.3/8 | 0.687 | 3.1/8 | £159.91 | In Stock | |
| OSG-22638804 | 3/4 | 14 | 1.3/8 | 0.906 | 3.1/4 | £238.15 | 1-2 days | |
| OSG-22638814 | 1 | 11.5 | 1.3/4 | 1.125 | 3.3/4 | £319.85 | 1-2 days |
No products match your filters.
