If you need high-strength grades (e.g., 10.9 or 12.9) or unusual lengths/pitches, these specialized distributors are the industry standard.
: Usually have radial slashes (e.g., three marks for Grade 5). where to buy metric bolts
: 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. If you need high-strength grades (e
or O'Reilly Auto Parts : Best for automotive-specific metric bolts, though they may not carry general-purpose hardware. Specialty & Online Suppliers (Best for Variety & Quality) or O'Reilly Auto Parts : Best for automotive-specific
: Known for having bulk hardware sections where you can buy metric bolts by weight, which is often very cost-effective.
: A popular choice for high-quality fasteners in low quantities with much better pricing than standard hardware stores.
: Usually have numbers like 8.8, 10.9, or 12.9 indicating strength.