: Excellent for buying "assortment kits" that give you a range of lengths in a specific diameter (like an M3 or M4 kit), which is helpful for hobbies like 3D printing.
: The most cost-effective option for massive quantities if you can wait several weeks for shipping. Identification Tips where to buy metric bolts
Before buying, check the bolt head for markings to ensure you have the right part: : Excellent for buying "assortment kits" that give
: Frequently cited by users as having the best selection of individual metric fasteners in-store, often including bins for small sizes like M3 or M5. : The gold standard for professional projects
: The gold standard for professional projects. They carry almost every conceivable size with exceptionally fast shipping, though they often require buying in small packs rather than individuals.
: Known for having bulk hardware sections where you can buy metric bolts by weight, which is often very cost-effective.