Metric Screw Size Index – M1.6 to M12
Explore every metric screw size we offer in one place. Jump straight to a size-specific shopping hub or open its matching size chart for head dimensions, pitches, and drive sizes. All hubs link to matching nuts, washers, and tools.
Looking to browse everything? Visit All Metric Fasteners.
Choose Your Metric Size
Metric Standards & Resources
Monster Bolts metric fasteners follow core DIN/ISO standards such as DIN 912 / ISO 4762 (Socket Head Cap), ISO 7380 (Button), DIN 7991 / ISO 10642 (Flat Socket), DIN 7985 (Phillips Pan), and DIN 933 / DIN 931 (Hex Cap Bolts). For torque guidance, see the Metric Socket Screw Torque & Specs.
Frequently Asked Questions
What does “M” mean in metric fasteners (e.g., M6 × 1.0)?
“M” indicates a metric thread. The first number is the nominal diameter in millimeters (M6 = 6 mm). The second number is the thread pitch in millimeters (M6 × 1.0 has a 1.0 mm pitch).
Coarse vs. fine threads — which should I choose?
Coarse (standard) threads assemble quickly and are more tolerant of minor damage or debris. Fine threads provide greater strength in thin materials and better vibration resistance but require more precise alignment.
Are DIN and ISO screws interchangeable?
Often yes, but confirm dimensions. Many DIN specs map closely to ISO replacements (e.g., DIN 912 ≈ ISO 4762). Always verify head and drive dimensions on the product page or size chart.
Do I need washers with socket cap screws?
Flat washers spread load on softer substrates or oversized holes. Spring/lock washers help resist loosening under vibration. Your size hub links to matching nuts and washers sized to the thread.