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OSG Threading Tap - UNC Spiral Point HSS-E - Steam Oxide Coated - Through Hole - No. 4 x 40
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Description
The OSG UNC Spiral Point Threading Tap No. 4 x 40 is a precision threading tool designed for through-hole applications, delivering clean, accurate UNC threads with reliable tool life. Built from cobalt-infused HSS-E and finished with a steam oxide coating, it’s engineered for demanding machining environments.
- Thread Type: UNC spiral point design optimized for through-hole tapping, promoting efficient thread formation.
- Material: HSS-E (high-speed steel with cobalt) for enhanced hardness and heat resistance.
- Coating: Steam oxide finish to improve wear resistance and corrosion protection in tough shop conditions.
- Chip Evacuation: Spiral point geometry directs chips forward, reducing clogging in through-holes and improving cycle efficiency.
- Size: No. 4 x 40 UNC threading tap, suitable for standard through-hole fastener work.
- Application: Ideal for tapping threads in steel, stainless steel, aluminum, and other metals found in production and repair environments.
This tap is crafted for professionals who need consistent, high-quality UNC threads without frequent tool changes. The cobalt-enhanced HSS-E provides superior edge retention under high cutting speeds, while the steam oxide coating extends usable life in challenging materials and coolant-heavy setups. The result is precise threads, fewer reworks, and a dependable option for through-hole assemblies in machining shops, maintenance departments, and job shops.
Part Numbers
- Protool Part Number
- OSG-23104574
- 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 - UNC Spiral Point HSS-E - Steam Oxide Coated - Through Hole
View full collection →You are viewing OSG-23104574. Click any other SKU to view its full details.
| Product SKU | Size | Pitch | Flute Length | Shank Diameter | Overall Length | Price | Stock | Order |
|---|---|---|---|---|---|---|---|---|
| OSG-23104574 Viewing | No. 4 | 40 | 11 | 3.15 | 48 | £69.82 | 1-2 days | |
| OSG-23104594 | No. 5 | 40 | 11 | 3.15 | 48 | £69.82 | 1-2 days | |
| OSG-23104614 | No. 6 | 32 | 13 | 3.55 | 50 | £42.63 | In Stock | |
| OSG-23104644 | No. 8 | 32 | 13 | 4.5 | 53 | £42.63 | In Stock | |
| OSG-23104664 | No. 10 | 24 | 16 | 5 | 58 | £42.63 | 1-2 days | |
| OSG-23104714 | 1/4 | 20 | 19 | 6.3 | 66 | £35.57 | In Stock | |
| OSG-23104744 | 5/16 | 18 | 22 | 8 | 72 | £40.27 | In Stock | |
| OSG-23104794 | 3/8 | 16 | 24 | 10 | 80 | £50.84 | In Stock | |
| OSG-23104894 | 1/2 | 13 | 29 | 9 | 89 | £73.51 | 1-2 days |
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