Fastenal should have or most any standard fasteners you need. For metric, they may need to order some of the finer thread pitches but they can get that delivered within a day or two. Beware that they're sticklers on shipping charges though.
i work on cars for a living. i usually go to salvage yards and buy buckets of bolts. i also dismantle cars so i have built up a stock of spare bolts in all common sizes.
i use them alot. i can tell you what size thread pitch a bolt is just by looking at it. i can also tell you what car or part the bolt came from..
youd be surprised how many cars come in that have been previously worked on and are missing bolts.
There are still a few of us mechanics that like to put all the bolts back in your car.
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