Most common flare nut sizes?

[FordToughF250]

What are the most common sizes used on cars and deisel trucks? I plan on buying some matco ones but not the whole set because ill go broke.

 

[nato]

I'm the same way. I have a mixed set of S/O's and Mac's right now....
I have a 10mm x 12mm, 1/2 x 9/16, 3/8 x 11/16 and 13/mm x 14mm.
Occaisionally I run into a 5/8 or 11/16 fitting on transmission lines, or something odd like that but you typically need a standard combo wrench (longer than flare nut length) for the added oomph to bust the sealer loose on the fittings.
Think common nut sizes: i.e. 3/16" brake line=3/8 ", 10mm, 7/16", 12mm and 1/2" nuts most widely seen. Both for ISO and dbl. flares.

I also plan on grabbing them all eventually, but I wanted the common individuals to start and progress with.
Sometimes I can kick myself for not waiting and picking complete sets up on here. Some guys have complete metric and standard sets for a hell of a deal, but I already have the one they offer and really don't feel like reselling the ones not needed. It would be a good deal to sweep them up anyhow though, so keep an eye out!!!!.

 

[caper]

15 & 18mm for power steering lines and 16mm(5/8) & 20mm for fuel filters.

 

[nexum1919]

since you mentioned the matco brand...
gearwrench makes flex head flare nut wrenches, and they are long. personally, i cannot tell the difference between the matco and gearwrench hardline stuff...

 

[FordToughF250]

Ya im not realy set on matco yet until I go to sears to get gearwrench ratcheting wrenches and look at the flarenut wrenches there