M10x1.25 is extremely common these days on many makes.
Yes, the common ones you tend to find, or at least I tend to find, are M10 x 1.25, M12 x 1.5 and M14 x 1.5.
Metric fine is very fine and only used for relatively specialised applications. The only common one on vehicles are the wheel bolts.
Umm, no. At least not on what I own. I have a 2006 Mitsubishi Evo; it uses fine thread bolts all over the place on the engine. My 2009 Tacoma also uses lots of fine threads.
To add, there are typically two "fine" metric pitches, which I'm sure you know since you're in the UK.
When I contribute to a thread like this, I’m attempting to be helpful to the O.P, who obviously has a particular problem to solve, and in this case answer a particular question about the tap bits that KnurledNut helpfully posted.
I could, just give a simple answer and say “they will be metric coarse”, however, I try and think through things a stage further. I assume the O.P. is in the U.S. so he’s probably used to looking at things like Unified threads and thread chasers, and is perhaps less used to looking at metric ones.
He may be thinking “I don’t want coarse thread, I need standard” or “they look like fine pitch”, so I felt a bit more explanation was fair, hence I stated that “metric coarse pitch is roughly equivalent to most other fine pitches” - which it is, and that they are MOSTLY (not exclusively) used on vehicles, which they are.
To continue, I stated “metric fine is very fine“ which it is, compared to say Unified fine, and only used for “relatively specialised“ applications, which I would argue it is. Wheel bolts are one such application. O.K. you’ve got some on your engine, but… the coarse pitch‘s are still, generally, the more common.
To be pedantic, the number of fine pitches available as standard varies with the thread size. In M4 for example, the standard / coarse pitch is .7, the fine .5. In M14, the standard / coarse pitch is 2, but fine pitches generally available are 1.5, 1.25 and 1.0.
In the case of these tap bits, they go down to 3mm and I would suggest that there is only one fine pitch regularly found in those small sizes.
For what it’s worth, I keep some basic metric taps and die nuts in my general box for dealing with threads on vehicles. The only metric fine I have are 10, 12 and 14 and those are all I’ve needed for vehicles, but everybody has different needs.
To get back on topic, yes, those tap bits look useful. Used in a bit ratchet they will be as low profile as anything, and a set would be a great thing to add to a road box.
My only concern with those particular ones is that I believe they are made in China, and I’ve never found a Chinese tap that was up to much.
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