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Wiseman Threading Tools Taper Lead Machine Nut Metric HSS Tap - M18x2.5
| Thread Form | Metric |
| Size | M18 |
| Pitch | 2.5 |
| Tap Type | Taper Lead Tap |
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Description
The Wiseman Threading Tools Taper Lead Machine Nut M18x2.5 is a precision high-speed steel thread tap designed to deliver clean, accurate internal threads with ease. Ground for a tight, dependable cut and uncoated for reliable chip clearance, this general‑purpose tap follows BS 949 dimensions to ensure compatibility with metric holes and nuts that share the same standard. The taper lead design starts the thread smoothly, reducing insertion effort and helping you achieve a consistent thread from the first pass. The tap features a right-hand thread for clockwise rotation, making it a versatile addition to both professional shops and workshop setups.

- Material and finish: High-speed steel ground to precise form, uncoated for versatile use with standard cutting fluids.
- Thread specification: Metric M18x2.5 with taper lead and a right-hand thread—designed for reliable, predictable cutting in internal threads.
- Standards: BS 949 dimensions ensure compatibility with common metric nuts and threaded holes used in modern machining and fabrication.
- Design advantage: Taper lead eases alignment and starts the cut with less resistance, reducing chatter and increasing first-pass success.
- Ideal applications: Creating or repairing internal threads in metal components such as brackets, housings, and machinery parts where an M18x2.5 thread is required.
- Usage tips: Apply appropriate cutting fluid, keep the tap square to the workpiece, and back off periodically to break chips for a smoother finish and longer tool life.
This tap is crafted for professionals and serious enthusiasts who demand consistent thread forms and dependable performance across multiple jobs. The taper lead feature distinguishes it from standard taps by enabling a smoother start in slightly misaligned holes, helping you avoid cross‑threading and thread damage. Use it in conjunction with a suitable tapping setup—manual or machine—to maximize precision, efficiency, and repeatable results.
Why choose this Wiseman tap? It combines a robust HSS core with a thoughtful taper lead design, BS 949 compliance, and a practical uncoated finish that works well with common coolants and lubricants. If you’re building or repairing components that require a precise M18x2.5 internal thread, this tap provides a reliable, long‑lasting solution that professional machinists reach for again and again.
Part Numbers
- Protool Part Number
- T14509MT
- Brand
- Wiseman
- Category
- Hand 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: Wiseman Threading Tools Taper Lead Machine Nut Metric HSS Taps
View full collection →You are viewing T14509MT. Click any other SKU to view its full details.
| Product SKU | Thread Form | Size | Pitch | Tap Type | Thread Direction | Price | Stock | Order |
|---|---|---|---|---|---|---|---|---|
| T10559MT | Metric | M3 | 0.5 | Taper Lead Tap | Right Hand | £22.47 | 1-2 days | |
| T10859MT | Metric | M4 | 0.7 | Taper Lead Tap | Right Hand | £21.93 | 1-2 days | |
| T11159MT | Metric | M5 | 0.8 | Taper Lead Tap | Right Hand | £21.93 | 1-2 days | |
| T11409MT | Metric | M6 | 1 | Taper Lead Tap | Right Hand | £21.93 | 1-2 days | |
| T11909MT | Metric | M8 | 1.25 | Taper Lead Tap | Right Hand | £24.70 | 1-2 days | |
| T12509MT | Metric | M10 | 1.5 | Taper Lead Tap | Right Hand | £30.98 | 1-2 days | |
| T13109MT | Metric | M12 | 1.75 | Taper Lead Tap | Right Hand | £41.56 | 1-2 days | |
| T13659MT | Metric | M14 | 2 | Taper Lead Tap | Right Hand | £52.97 | 1-2 days | |
| T14109MT | Metric | M16 | 2 | Taper Lead Tap | Right Hand | £65.94 | 1-2 days | |
| T14509MT Viewing | Metric | M18 | 2.5 | Taper Lead Tap | Right Hand | £89.63 | 1-2 days | |
| T14859MT | Metric | M20 | 2.5 | Taper Lead Tap | Right Hand | £107.48 | 1-2 days | |
| T15659MT | Metric | M24 | 3 | Taper Lead Tap | Right Hand | £124.28 | 1-2 days |
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