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Baer Heli Coil Tap - Wire Thread Insert - Bottoming Tap (STI) - UNF - No. 4 x 48
| Thread Form | UNF |
| Size | No. 4 |
| Pitch | 48 |
| Lead | Bottoming Tap (STI) |
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Description
The Baer Heli Coil Tap is the precise, durable tool you reach for when you need dependable thread repairs and reinforced holes with a Heli-Coil wire-thread insert system. Designed for the No. 4-48 UNF bottoming tap specification, it cuts clean, full-depth threads so the insert seats securely every time, restoring strength to weakened threads in a variety of metals and applications.
With a focus on longevity and consistency, this tap is built to stand up to repeated use in demanding environments. Its geometry is optimized for precise engagement with Heli-Coil inserts, delivering burr-free threads that improve insert performance and torque-tolerance. The bottoming design means you can reach the last depth of the hole, ensuring a complete, reliable thread engagement for critical fasteners.
- Bottoming tap design (STI): achieves full thread depth for flawless insert seating and maximum strength in the repaired hole.
- UNF No. 4 x 48 compatibility: ideal for high-density, fine-thread fasteners commonly used in precision equipment and automotive work.
- Optimized for Heli-Coil inserts: creates the exact thread form required for reliable coil-insert reinforcement.
- Durable construction: engineered for repeated use in metal, with a tough, wear-resistant profile that resists lengthwise wear and deflection.
- Clean, burr-free results: precise cutting edges minimize debris and chatter, making installation smoother and faster.
- Versatile repair tool: perfect for repairing stripped holes, restoring thread integrity in aluminum, steel, or other common base materials.
Ideal for machine shops, automotive tuners, and maintenance professionals, this tap helps you reclaim damaged threads without resorting to oversized repairs or replacements. Use it with the corresponding Heli-Coil inserts to restore original strength and service life to fastened joints, fixtures, and housings. For reliable, repeatable results on critical holes, trust the Baer Heli Coil Tap to deliver every time.
Part Numbers
- Protool Part Number
- BAER-B3151
- Brand
- BAER
- Category
- Heli Coil Tap
Need cutting data? Call 01732 887334 or email sales@protool-ltd.co.uk.
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: Baer Heli Coil Taps - Wire Thread Insert - Bottoming Tap (STI) - UNF
View full collection →You are viewing BAER-B3151. Click any other SKU to view its full details.
| Product SKU | Size | Pitch | Tap Diameter (D1) | Flute Length (L2) | Overall Length (L1) | Shank Diameter (D2) | Price | Stock | Order |
|---|---|---|---|---|---|---|---|---|---|
| BAER-B3151 Viewing | No. 4 | 48 | 3.5 | 13 | 53 | 4 | £14.86 | 5 days | |
| BAER-B3152 | No. 6 | 40 | 4.3 | 13 | 53 | 4.5 | £14.86 | 5 days | |
| BAER-B3153 | No. 8 | 36 | 5.1 | 17 | 62 | 5.6 | £14.86 | 5 days | |
| BAER-B3154 | No. 10 | 32 | 5.9 | 19 | 66 | 6.3 | £14.86 | 5 days | |
| BAER-B3155 | 1/4 | 28 | 7.5 | 19 | 69 | 8 | £9.77 | 5 days | |
| BAER-B3156 | 5/16 | 24 | 9.3 | 20 | 76 | 10 | £10.84 | 5 days | |
| BAER-B3157 | 3/8 | 24 | 10.9 | 22 | 82 | 8 | £11.13 | 5 days | |
| BAER-B3158 | 7/16 | 20 | 12.8 | 24 | 84 | 9 | £14.86 | 5 days | |
| BAER-B3159 | 1/2 | 20 | 14.4 | 25 | 90 | 11.2 | £16.89 | 5 days | |
| BAER-B3160 | 9/16 | 18 | 16.1 | 29 | 104 | 12.5 | £28.50 | 5 days | |
| BAER-B3161 | 5/8 | 18 | 17.7 | 29 | 104 | 14 | £35.14 | 5 days | |
| BAER-B3162 | 3/4 | 16 | 21.1 | 29 | 104 | 14 | £43.03 | 5 days | |
| BAER-B3163 | 7/8 | 14 | 24.6 | 35 | 120 | 18 | £62.05 | 5 days | |
| BAER-B3164 | 1 | 12 | 28.2 | 37 | 127 | 20 | £62.05 | 5 days | |
| BAER-B3165 | 1 | 14 | 27.8 | 37 | 127 | 20 | £62.90 | 5 days |
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