Metric tap and die set: what to check before you buy
Updated: October 2026
You are in the garage with a crossed bolt, and the listing in front of you is selling a piece count. A metric tap and die set only helps if the pitch on the fastener is in the box, if a die is there when the damage is on the bolt, and if the tap you pick up is the lead that hole needs. This page is the order of those checks for a first hand set in the UK. The [taps and dies comparison](/hub/drilling-and-accessories/taps-and-dies) lines up the twelve amazon.co.uk listings. Prices are the GBP shelf prices captured for those listings. A qualifying purchase can earn a commission at no extra cost to you.
You are in the garage with a crossed bolt, and the listing in front of you is selling a piece count.
You are in the garage with a crossed bolt, and the listing in front of you is selling a piece count. A metric tap and die set only helps if the pitch on the fastener is in the box, if a die is there when the damage is on the bolt, and if the tap you pick up is the lead that hole needs. This page is the order of those checks for a first hand set in the UK. The taps and dies comparison lines up the twelve amazon.co.uk listings. Prices are the GBP shelf prices captured for those listings. A qualifying purchase can earn a commission at no extra cost to you.
Our top picks
| Badge | Product | Taps per size | Pitch gauge | Stated material | Note | Price | Offer |
|---|---|---|---|---|---|---|---|
| Best overall |  Gunpla Gunpla 32-piece metric tap and die set | 3 | Yes | Hardened tungsten alloy | 8.6 | about £25.98 | View offer |
| Alternative |  Gunpla Gunpla 40-piece metric tap and die set | Coarse and fine pairs | Yes | Hardened tungsten alloy | 8.4 | about £25.60 | View offer |
| Best value |  GreeSuit GreeSuit 32-piece tap and die set 32-SL | 3 | n/a | Tungsten and bearing steel | 8.1 | about £21.86 | View offer |
On this page
Read the size and the pitch first
M8 on its own is not a complete name. Coarse M8 is M8 × 1.25, and RS describes that millimetre pitch under BS 3643. The sizes you meet most often are M6 × 1, M8 × 1.25, M10 × 1.5 and M12 × 1.75. M8 × 1.0 will not share a die with M8 × 1.25. If the gauge leaf is in threads per inch, that case belongs on the metric or imperial page. The Gunpla 40-piece at £25.60 and the Faankiton 110-piece at £83.99 print fine pairs. The Zerone title says M2–M18 and does not list the pitches.
Taps, dies and the three leads
A tap cuts the thread inside a hole. A die cuts the thread on a bolt. The CYH set at £6.46 and the EZO set at £7.49 do not list die sizes. The cheapest title that does say taps and dies is the QWORK 12-piece at £9.99, range M6–M12. A bottoming tap has a short lead for a blind hole. UK sellers sometimes print plug for that short lead. In North American lists, plug is the middle tap, and PG Merlin separates those meanings. The Gunpla 32-piece and both GreeSuit 32-piece listings state three taps of each of seven coarse sizes. One tap per size cannot hand you a bottoming tap. The order is on the how to use a tap and die page.
What the steel line is really saying
Carbon steel, tungsten alloy and high-speed steel are sentences on a product page, not a hardness test we carried out. Ultimate Handyman puts carbon steel on occasional home threads, and high-speed steel on threads you cut regularly in steel. A tungsten-alloy bullet is not that second case. The Faankiton listings print more than one steel line. Zerone’s title says carbon steel and Technical Details say high speed steel. GreeSuit claims 55 HRC. The only set here that says high-speed steel is the FOURROBBER 41-piece at £49.99, at 3.9 from 15 reviews.
What these price bands buy
From about £15 to £26 the boxes start to look like a home set. The three-tap sets in that band are the GreeSuit 32-SL at £21.86, the other GreeSuit 32-piece at £22.88, and the Gunpla 32-piece at £25.98, which lists a pitch gauge. The Gunpla 40-piece at £25.60 is the fine-and-coarse option, not a third tap of one pitch. At £49.99 the FOURROBBER set is the high-speed-steel and 5° ratchet claim, on 15 reviews. At £83.99 the Faankiton 110-piece is the M2–M18 list. The Zerone at £92.34 is 4.8 from 13 ratings.
If the set is short or the wrench cracks
The Consumer Rights Act 2015, section 22, gives you 30 days to reject goods that are not of satisfactory quality, not fit for purpose, or not as described. A missing M3 tap or a wrench that arrives in pieces is a fact you can put in front of the seller. This page cannot promise what a marketplace will do. If the thread is Whitworth, Unified or a pipe thread, the set is the wrong form rather than a faulty cutter. Measure first, then match the box.
Common questions
Is M3 to M12 enough for home repairs?
For many household bolts, M6, M8 and M10 are the sizes people reach for, which is the point UK Workshop readers make. An M3-to-M12 coarse set covers those, plus M4, M5 and M12. It does not cover an M14 fastener, an M2 thread, or any fine pitch. If your bolt is M8 × 1 rather than M8 × 1.25, M8 on the lid is still the wrong box.
Do I need a fine-pitch die as well as a coarse one?
You need the fine die only if a fine pitch is what you are holding. Coarse M6 × 1, M8 × 1.25, M10 × 1.5 and M12 × 1.75 are the defaults when nothing else is printed. A fine pitch needs its own tap and its own die. The Gunpla 40-piece lists pairs such as M6 × 0.75 and M6 × 1.0. A coarse-only 32-piece set does not.
What is the difference between one tap per size and three?
One tap per size gives you a single lead, usually enough to start a through hole. Three taps of one pitch let you move from a long lead to a second tap and then to a short bottoming lead on a blind hole. The Gunpla 32-piece and both GreeSuit 32-piece listings state three taps per coarse size. They still list one die per size. Three taps do not make the steel harder.
Is a carbon-steel or tungsten-alloy set the same as high-speed steel?
No. High-speed steel is a specific claim, and only the FOURROBBER listing in this group says it, at £49.99 with 15 reviews. Tungsten alloy steel and carbon steel are different lines. Ultimate Handyman treats a cheaper set as reasonable for occasional threads, and high-speed steel as the case when you cut new threads in steel often. A slogan on the bullet is the seller’s description.
Should I buy a pitch gauge separately?
Use a gauge before you choose the set, not after you have cut the wrong pitch. The Gunpla 32-piece and the Gunpla 40-piece include one. A millimetre pitch that fits means a metric thread, coarse or fine. A threads-per-inch leaf that fits means a different form, and a metric set will not rescue it. Borrow a gauge for the first measurement if you do not own one yet.
Related pages
Sources
Sources from the research digest. amazon.co.uk listings in this category were captured on 15 October 2026. We did not run a laboratory test.
- Ultimate Handyman, Tap and Die (retrieved 15 October 2026)
- Grove Components, Tap Terminology (retrieved 15 October 2026)
- PG Merlin, The different types of taps (retrieved 15 October 2026)
- Protool, thread forms (retrieved 15 October 2026)
- RS, guide to metric bolt sizes (retrieved 15 October 2026)
- ISO 529:2017, short machine and hand taps (retrieved 15 October 2026)
- HSE, PUWER overview (retrieved 15 October 2026)
- Consumer Rights Act 2015, section 22 (retrieved 15 October 2026)