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OSG Threading Tap - BA Spiral Flute HSS-E - Steam Oxide Coated Plus - Blind Hole - 4BA
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Description
The OSG BA Spiral Flute Threading Tap is a precision tapping solution designed for blind-hole applications that require exact 4BA British Association threads. Crafted from cobalt-enriched high-speed steel (HSS-E) and finished with Steam Oxide Coated Plus, it combines durability with reliable heat resistance for demanding machining tasks.
- Size: 4BA thread for compact, precise fittings in small assemblies
- Material: HSS-E (high-speed steel with cobalt) for improved hardness and wear resistance
- Finish: Steam Oxide Coated Plus for enhanced corrosion resistance and heat tolerance
- Cutting geometry: Spiral flute design that promotes efficient chip evacuation in blind holes
- Application: Optimized for blind-hole threading where space is limited and accuracy matters
- Technology: Supported by OSG’s advanced threading technology for consistent thread quality and extended tool life
This combination delivers clean, accurate threads with minimal tool wear and dependable performance in challenging, confined threading tasks. The spiral flute helps chips clear quickly, reducing the risk of binding and heat buildup in blind holes, while the durable HSS-E substrate and protective oxide finish extend tool life and reliability across multiple jobs. Ideal for precision assemblies, electronics housings, and small mechanical components where tight tolerances and repeatable results are essential.
Part Numbers
- Protool Part Number
- OSG-23209140
- 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 - BA Spiral Flute HSS-E - Steam Oxide Coated Plus - Blind Hole
View full collection →You are viewing OSG-23209140. Click any other SKU to view its full details.
| Product SKU | Size | Flute Length | Shank Diameter | Overall Length | Price | Stock | Order |
|---|---|---|---|---|---|---|---|
| OSG-23209120 | 2BA | 16 | 5 | 58 | £40.85 | In Stock | |
| OSG-23209140 Viewing | 4BA | 13 | 4.5 | 53 | £40.85 | In Stock | |
| OSG-23209160 | 6BA | 9.5 | 2.8 | 44.5 | £46.05 | 1-2 days |
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