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Wiseman Threading Tools Spiral Point Metric HSS Tap Left Hand - M20x2.5

Wiseman Threading Tools Spiral Point Metric HSS Tap Left Hand - M20x2.5

SKU:T14856SPLH

Wiseman Threading Tools Spiral Point Metric HSS Tap Left Hand - M20x2.5 is a purpose-built internal threading solution for metalworking professionals and serious hobbyists who demand reliable, pr... Read more ↓
Thread FormMetric
SizeM20
Pitch2.5
Tap TypeSpiral Point Tap
Thread DirectionLeft Hand
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£64.49
Prices shown ex. VAT
1–2 days estimated lead time — subject to availability
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Wiseman Threading Tools Spiral Point Metric HSS Tap Left Hand - M20x2.5 is a purpose-built internal threading solution for metalworking professionals and serious hobbyists who demand reliable, precise left-hand threads. Forged from high-speed steel and ground to exacting ISO 529 dimensions, this tap delivers controlled, consistent cutting performance in standard through-holes without the need for coatings that can wear unevenly in aggressive tapping sessions. What makes this tap stand out - Left-hand thread, M20x2.5: Specifically designed to cut left-handed internal threads, ideal for assemblies where fasteners tighten in the reverse direction to prevent loosening under vibration. - Spiral point (gun nose) geometry: The forward-cutting tip drives chips ahead of the tap and out of the hole, reducing clogging and improving productivity in through-hole applications. - Uncoated HSS, general-purpose: A robust, affordable choice for everyday threading tasks across common metals like steel, cast iron, and aluminum. No coating means easy re-sharpening and straightforward inspection of the tool’s geometry. - Precision ground and ISO 529 compliant: Ensures reliable thread form, compatibility with standard nuts and accessories, and predictable results across jobs. - Right tool for the job in tight tolerances: The combination of spiral point design and left-hand threading makes it an excellent option when orientation and anti-rotation considerations matter in a machine or fixture. Who this is for - Machinists, engineers, and workshop pros who routinely create internal threads in left-handed configurations. - Projects that require secure, anti-rotation threaded joints in through-holes, such as bespoke machinery mounts, certain automotive assemblies, or gear housings. - Makers seeking a durable, repair-friendly tapping solution that performs well across mild to moderate threading tasks without specialty coatings. How to get the best results - Use appropriate cutting fluid or tapping oil to maximize tool life and achieve cleaner thread forms. - Start with a clean, deburred hole and a properly sized pilot drill to ISO 529 recommendations for M20x2.5 left-hand threads. - Apply steady, moderate torque with a suitable tap wrench or holder; avoid excessive feed pressure to prevent chatter or premature wear. - Post-tap deburring ensures a smooth bore and mating hardware seating, especially important for high-load or precision assemblies. Practical use cases and outcomes - Create durable left-handed internal threads in control housings, brake components, or hydraulic fittings where reverse-threaded fasteners prevent loosening during operation. - Achieve repeatable thread quality in prototype and production runs, thanks to the tap’s standardized ISO dimensions and reliable spiral-point cutting action. - A versatile general-purpose tool in metalworking shops that reduces the need for multiple specialized taps, while delivering dependable results time after time. In short, the Wiseman M20x2.5 Left-Hand Spiral Point HSS Tap is a focused, reliable choice for left-handed internal threads in through-holes. Its spiral-point design, uncoated HSS construction, and ISO-compliant geometry deliver precise threads, efficient chip evacuation, and practical value in everyday metalworking tasks.
Thread Form Metric
Size M20
Pitch 2.5
Tap Type Spiral Point Tap
Thread Direction Left Hand

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.

★★★★★
Nice experience staff are very helpful and interested...
Staff are very helpful and interested in providing a good service making us the customer feel valued.
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★★★★★
first place we look
honest about stock and prices are competitive.
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★★★★★
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Staff are very helpful and polite.Goods that were in stock were dispatched same day and back orders were quick in coming through .
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★★★★★
Buying experience
Phone requests are handled quickly and without any fuss. The website is easy to use and straightforward to order from. It’s especially helpful that it shows real‑time availability, so we don’t need to call to confirm whether parts will arrive.
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Full Range: Wiseman Threading Tools Spiral Point Metric HSS Taps Left Hand

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