BoltsandNuts.com Grade 10.9 JIS Hex Flange Bolts Frame Cap Screws Zinc Class M6 M8 M10 J.I.S. Assortment Kit

I've been making repairs on my 2003 Mitsubishi Lancer Evolution and this set has come in handy time and time again for cases where I either broke/ruined the bolt/nut removing it due to it being rusted over or in cases where the I just want fresh bolts to replace the old worn/rusted ones. Obviously this is not going to have every bolt you'll ever need, but I would guess that at least on Japanese cars this set will let you replace 50-60% of the bolts. If they added M12s to this set, you could bump that estimate up to 60-70%.I have no way of verifying the class 10.9 aspect of it, but I haven't seen any signs/red flags that these are cheap/shitty fasteners and in some oddball cases where I was trying to cut one via a wheel grinder it was an absolute PITA (which is a good thing). Definitely harder than some lower class bolts I have cut in the past so it seems to ring true that these are 10.9 although what I did obviously doesn't prove that 100%.In a perfect world there would be a set that had M8, M10, M12 bolts in both thread pitches for each bolt and in length increments of 5mm then 10mm (as they get larger). With two to four bolts in each variation, but I haven't seen that kit out there and this one, especially for the price is a great investment if your doing lots of work on any Japanese car that is older or going to need non-specialized bolt replacements. I will say you can go on their website (i'll let you figure out what it is, hint look at the brand ;-) ) and order bolts individually and I think I might do that for the M12s, but it's not as cheap as buying a kit like this (still much better than a Hardware store though).

They are not butter bolts, 10.9 grade. Got them because they lock, spin on free, and no extra washers required. Easy install on hard to reach areas. Also cheap enough for me for at home use. Only complaint is the clear box had a 2 inch piece broken off. Put come cardboard to fill the void and it works.

I hate using just hex bolts. This kit having a flanged head makes me happy. They are machined very well. So much nicer than part store bolts.

needed jis bolts good quality bit spendy but worth it compared to crap on other listings

Has come in handy so many times already and the selection of sizes covers almost any application.